Xin Liu

Search results

• 2023

  A Chandra X-Ray Survey of Optically Selected Close Galaxy Pairs: Unexpectedly Low Occupation of Active Galactic Nuclei

  He, L., Hou, M., Li, Z., Feng, S. & Liu, X., Jun 1 2023, In: Astrophysical Journal. 949, 2, 49.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • active galactic nuclei 100%
  • occupation 99%
  • galaxies 71%
  • x rays 43%
  • interacting galaxies 33%

• A close quasar pair in a disk–disk galaxy merger at z = 2.17

  Chen, Y., Liu, X., Foord, A., Shen, Y., Oguri, M., Chen, N., Di Matteo, T., Holgado, M., Hwang, H. & Zakamska, N., Apr 6 2023, In: Nature. 616, 7955, p. 45-49 5 p.

  Research output: Contribution to journal › Article › peer-review

  • Galaxies 100%

• AGNet: Weighing Black Holes with Deep Learning

  Lin, J. Y. Y., Pandya, S., Pratap, D., Liu, X., Kind, M. C. & Kindratenko, V., Feb 1 2023, In: Monthly Notices of the Royal Astronomical Society. 518, 4, p. 4921-4929 9 p.

  Research output: Contribution to journal › Article › peer-review

  • learning 100%
  • light curve 45%
  • quasars 30%
  • estimates 17%
  • observatory 16%

• Detection, instance segmentation, and classification for astronomical surveys with deep learning (DeepDISC): Detectron2 implementation and demonstration with hyper suprime-cam data

  Merz, G., Liu, Y., Burke, C. J., Aleo, P. D., Liu, X., Kind, M. C., Kindratenko, V. & Liu, Y., Sep 14 2023, (E-pub ahead of print) In: Monthly Notices of the Royal Astronomical Society.

  Research output: Contribution to journal › Article › peer-review

  • cams 100%
  • learning 81%
  • transformers 78%
  • segmentation 66%
  • completeness 57%

• Dwarf AGNs from variability for the origins of seeds (DAVOS): Intermediate-mass black hole demographics from optical synoptic surveys

  Burke, C. J., Shen, Y., Liu, X., Natarajan, P., Caplar, N., Bellovary, J. M. & Wang, Z. F., Jan 1 2023, In: Monthly Notices of the Royal Astronomical Society. 518, 2, p. 1880-1904 25 p.

  Research output: Contribution to journal › Article › peer-review

  • active galactic nuclei 100%
  • seeds 90%
  • galaxies 31%
  • dwarf galaxies 24%
  • stellar mass 22%

• Dwarf AGNs from Variability for the Origins of Seeds (DAVOS): Optical Variability of Broad-line Dwarf AGNs from the Zwicky Transient Facility

  Wang, Z. F., Burke, C. J., Liu, X. & Shen, Y., May 1 2023, In: Monthly Notices of the Royal Astronomical Society. 521, 1, p. 99-113 15 p., stad532.

  Research output: Contribution to journal › Article › peer-review

  • active galactic nuclei 100%
  • seeds 90%
  • light curve 41%
  • damping 28%
  • light quality 22%

• NOEMA Detection of Circumnuclear Molecular Gas in X-Ray Weak Dual Active Galactic Nuclei: No Evidence for Heavy Obscuration

  Hou, M., Li, Z., Liu, X., Li, Z., Li, R., Wang, R., Wang, J. & Ho, L. C., Jan 1 2023, In: Astrophysical Journal. 943, 1, 50.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • occultation 100%
  • molecular gases 91%
  • active galactic nuclei 84%
  • detection 48%
  • gas 41%

• Statistics of Galactic-scale Quasar Pairs at Cosmic Noon

  Shen, Y., Hwang, H. C., Oguri, M., Chen, N., Matteo, T. D., Ni, Y., Bird, S., Zakamska, N., Liu, X., Chen, Y. C. & Kratter, K. M., Jan 1 2023, In: Astrophysical Journal. 943, 1, 38.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • noon 100%
  • quasars 70%
  • statistics 55%
  • erg 19%
  • merger 17%

• The SDSS-V Black Hole Mapper Reverberation Mapping Project: Unusual Broad-line Variability in a Luminous Quasar

  Fries, L. B., Trump, J. R., Davis, M. C., Grier, C. J., Shen, Y., Anderson, S. F., Dwelly, T., Eracleous, M., Homayouni, Y., Horne, K., Krumpe, M., Morrison, S., Runnoe, J. C., Trakhtenbrot, B., Assef, R. J., Brandt, W. N., Brownstein, J., Dabbieri, C., Fix, A., Fonseca Alvarez, G., & 13 othersFrederick, S., Hall, P. B., Koekemoer, A. M., Li, J. I. H., Liu, X., Martínez-Aldama, M. L., Ricci, C., Schneider, D. P., Sharp, H. W., Temple, M. J., Yang, Q., Zeltyn, G. & Bizyaev, D., May 1 2023, In: Astrophysical Journal. 948, 1, 5.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • reverberation 100%
  • quasars 88%
  • project 46%
  • gases 25%
  • gas 25%
• 2022

  A Transient “Changing-look” Active Galactic Nucleus Resolved on Month Timescales from First-year Sloan Digital Sky Survey V Data

  Zeltyn, G., Trakhtenbrot, B., Eracleous, M., Runnoe, J., Trump, J. R., Stern, J., Shen, Y., Hernández-García, L., Bauer, F. E., Yang, Q., Dwelly, T., Ricci, C., Green, P., Anderson, S. F., Assef, R. J., Guolo, M., MacLeod, C., Davis, M. C., Fries, L., Gezari, S., & 15 othersGrogin, N. A., Homan, D., Koekemoer, A. M., Krumpe, M., LaMassa, S., Liu, X., Merloni, A., Martínez-Aldama, M. L., Schneider, D. P., Temple, M. J., Brownstein, J. R., Ibarra-Medel, H., Burke, J., Pellegrino, C. & Kollmeier, J. A., Nov 1 2022, In: Astrophysical Journal Letters. 939, 1, L16.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • active galactic nuclei 100%
  • quasars 98%
  • dimming 92%
  • spectroscopy 82%
  • transition 40%

• Dwarf AGNs from Optical Variability for the Origins of Seeds (DAVOS): Insights from the dark energy survey deep fields

  Burke, C. J., Liu, X., Shen, Y., Phadke, K. A., Yang, Q., Hartley, W. G., Harrison, I., Palmese, A., Guo, H., Zhang, K., Kron, R., Turner, D. J., Giles, P. A., Lidman, C., Chen, Y. C., Gruendl, R. A., Choi, A., Amon, A., Sheldon, E., Aguena, M., & 51 othersAllam, S., Andrade-Oliveira, F., Bacon, D., Bertin, E., Brooks, D., Carnero Rosell, A., Carrasco Kind, M., Carretero, J., Conselice, C., Costanzi, M., Da Costa, L. N., Pereira, M. E. S., Davis, T. M., De Vicente, J., Desai, S., Diehl, H. T., Everett, S., Ferrero, I., Flaugher, B., Garciá-Bellido, J., Gaztanaga, E., Gruen, D., Gschwend, J., Gutierrez, G., Hinton, S. R., Hollowood, D. L., Honscheid, K., Hoyle, B., James, D. J., Kuehn, K., Maia, M. A. G., Marshall, J. L., Menanteau, F., Miquel, R., Morgan, R., Paz-Chinchón, F., Pieres, A., Plazas Malagón, A. A., Reil, K., Romer, A. K., Sanchez, E., Schubnell, M., Serrano, S., Sevilla-Noarbe, I., Smith, M., Suchyta, E., Tarle, G., Thomas, D., To, C., Varga, T. N. & Wilkinson, R. D., Oct 1 2022, In: Monthly Notices of the Royal Astronomical Society. 516, 2, p. 2736-2756 21 p.

  Research output: Contribution to journal › Article › peer-review

  • dark energy 100%
  • active galactic nuclei 97%
  • seeds 88%
  • light curve 62%
  • energy 46%

• Investigating the Accretion Nature of Binary Supermassive Black Hole Candidate SDSS J025214.67-002813.7

  Foord, A., Liu, X., Gültekin, K., Whitley, K., Shi, F. & Chen, Y. C., Mar 1 2022, In: Astrophysical Journal. 927, 1, 3.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • accretion 100%
  • active galactic nuclei 94%
  • spectral energy distribution 50%
  • x rays 20%
  • energy 19%

• Obscured active galactic nuclei and the need for optical to near-infrared, massively multiplexed, spectroscopic facilities

  Petric, A., Lacy, M., Juneau, S., Shen, Y., Fan, X., Flagey, N., Gordon, Y., Haggard, D., Hall, P. B., Hathi, N., Ilić, D., Lagos, C. D. P., Liu, X., O'Dea, C., Popović, L., Sheinis, A., Wang, Y. & Xue, Y., Jan 1 2022, In: Astronomische Nachrichten. 343, 1-2, e210053.

  Research output: Contribution to journal › Article › peer-review

  • active galactic nuclei 100%
  • near infrared 91%
  • astronomy 57%
  • galaxies 56%
  • need 52%

• Optical variability of quasars with 20-yr photometric light curves

  Stone, Z., Shen, Y., Burke, C. J., Chen, Y. C., Yang, Q., Liu, X., Gruendl, R. A., Adamów, M., Andrade-Oliveira, F., Annis, J., Bacon, D., Bertin, E., Bocquet, S., Brooks, D., Burke, D. L., Carnero Rosell, A., Carrasco Kind, M., Carretero, J., Da Costa, L. N., Pereira, M. E. S., & 35 othersDe Vicente, J., Desai, S., Diehl, H. T., Doel, P., Ferrero, I., Friedel, D. N., Frieman, J., García-Bellido, J., Gaztanaga, E., Gruen, D., Gutierrez, G., Hinton, S. R., Hollowood, D. L., Honscheid, K., James, D. J., Kuehn, K., Kuropatkin, N., Lidman, C., Maia, M. A. G., Menanteau, F., Miquel, R., Morgan, R., Paz-Chinchón, F., Pieres, A., Plazas Malagón, A. A., Rodriguez-Monroy, M., Sanchez, E., Scarpine, V., Serrano, S., Sevilla-Noarbe, I., Smith, M., Suchyta, E., Swanson, M. E. C., Tarle, G. & To, C., Jul 1 2022, In: Monthly Notices of the Royal Astronomical Society. 514, 1, p. 164-184 21 p.

  Research output: Contribution to journal › Article › peer-review

  • random walk 100%
  • quasars 94%
  • light curve 92%
  • damping 58%
  • power spectra 32%

• Varstrometry for Off-nucleus and Dual Subkiloparsec AGN (VODKA): Hubble Space Telescope Discovers Double Quasars

  Chen, Y. C., Hwang, H. C., Shen, Y., Liu, X., Zakamska, N. L., Yang, Q. & Li, J. I., Feb 1 2022, In: Astrophysical Journal. 925, 2, 162.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • Hubble Space Telescope 100%
  • quasars 94%
  • nuclei 60%
  • merger 59%
  • astrometry 14%

• Very Large Array Multiband Radio Imaging of the Triple AGN Candidate SDSS J0849+1114

  Peng, S., Li, Z., Liu, X., Nyland, K., Wrobel, J. M. & Hou, M., Jul 1 2022, In: Astrophysical Journal. 934, 1, 89.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • Very Large Array (VLA) 100%
  • active galactic nuclei 80%
  • nuclei 50%
  • lobes 26%
  • erg 26%
• 2021

  A characteristic optical variability time scale in astrophysical accretion disks

  Burke, C. J., Shen, Y., Blaes, O., Gammie, C. F., Horne, K., Jiang, Y. F., Liu, X., McHardy, I. M., Morgan, C. W., Scaringi, S. & Yang, Q., Aug 13 2021, In: Science. 373, 6556, p. 789-792 4 p.

  Research output: Contribution to journal › Article › peer-review

  • Physical Phenomena 100%
  • Hot Temperature 55%

• A hidden population of high-redshift double quasars unveiled by astrometry

  Shen, Y., Chen, Y. C., Hwang, H. C., Liu, X., Zakamska, N., Oguri, M., Li, J. I. H., Lazio, J. & Breiding, P., Jun 2021, In: Nature Astronomy. 5, 6, p. 569-574 6 p.

  Research output: Contribution to journal › Article › peer-review

  • astrometry 100%
  • quasars 79%
  • time measurement 8%
  • galaxies 8%
  • requirements 7%

• Discovery of a candidate binary supermassive black hole in a periodic quasar from circumbinary accretion variability

  Liao, W. T., Chen, Y. C., Liu, X., Miguel Holgado, A., Guo, H., Gruendl, R., Morganson, E., Shen, Y., Davis, T., Kessler, R., Martini, P., McMahon, R. G., Allam, S., Annis, J., Avila, S., Banerji, M., Bechtol, K., Bertin, E., Brooks, D., Buckley-Geer, E., & 50 othersRosell, A. C., Kind, M. C., Carretero, J., Castander, F. J., Cunha, C., D'Andrea, C., Da Costa, L., Davis, C., De Vicente, J., Desai, S., Thomas Diehl, H., Doel, P., Eifler, T., Evrard, A., Flaugher, B., Fosalba, P., Frieman, J., Garcia-Bellido, J., Gaztanaga, E., Glazebrook, K., Gruen, D., Gschwend, J., Gutierrez, G., Hartley, W., Hollowood, D. L., Honscheid, K., Hoyle, B., James, D., Krause, E., Kuehn, K., Lima, M., Maia, M., Marshall, J., Menanteau, F., Miquel, R., Malagon, A. P., Roodman, A., Sanchez, E., Scarpine, V., Schubnell, M., Serrano, S., Smith, M., Chris Smith, R., Soares-Santos, M., Sobreira, F., Suchyta, E., Swanson, M., Tarle, G., Vikram, V. & Walker, A., Jan 1 2021, In: Monthly Notices of the Royal Astronomical Society. 500, 3, p. 4025-4041 17 p.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • quasars 100%
  • accretion 92%
  • periodicity 65%
  • periodic variations 52%
  • acceleration (physics) 31%

• Do LIGO/Virgo Black Hole Mergers Produce AGN Flares? The Case of GW190521 and Prospects for Reaching a Confident Association

  Palmese, A., Fishbach, M., Burke, C. J., Annis, J. & Liu, X., Jun 20 2021, In: Astrophysical Journal Letters. 914, 2, L34.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • merger 100%
  • LIGO (observatory) 99%
  • active galactic nuclei 81%
  • flares 79%
  • gravitational waves 48%

• On the AGN nature of broad balmer emission in four low-redshift metal-poor galaxies

  Burke, C. J., Liu, X., Chen, Y. C., Shen, Y. & Guo, H., Jun 1 2021, In: Monthly Notices of the Royal Astronomical Society. 504, 1, p. 543-550 8 p.

  Research output: Contribution to journal › Article › peer-review

  • active galactic nuclei 100%
  • galaxies 71%
  • metal 58%
  • metals 49%
  • spectroscopy 32%

• Spectral variability of a sample of extreme variability quasars and implications for the Mg II broad-line region

  Yang, Q., Shen, Y., Chen, Y. C., Liu, X., Annis, J., Avila, S., Bertin, E., Brooks, D., Buckley-Geer, E., Rosell, A. C., Kind, M. C., Carretero, J., da Costa, L., Desai, S., Diehl, H. T., Doel, P., Frieman, J., Garcia-Bellido, J., Gaztanaga, E., Gerdes, D., & 32 othersGruen, D., Gruendl, R., Gschwend, J., Gutierrez, G., Hollowood, D. L., Honscheid, K., Hoyle, B., James, D., Krause, E., Kuehn, K., Lidman, C., Lima, M., Maia, M., Marshall, J., Martini, P., Menanteau, F., Miquel, R., Malagón, A. P., Sanchez, E., Scarpine, V., Schindler, R., Schubnell, M., Serrano, S., Sevilla, I., Smith, M., Soares-Santos, M., Sobreira, F., Suchyta, E., Swanson, M., Tarle, G., Vikram, V. & Walker, A., Apr 1 2021, In: Monthly Notices of the Royal Astronomical Society. 493, 4, p. 5773-5787 15 p.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • quasars 100%
  • time measurement 45%
  • continuums 41%
  • luminosity 30%
  • spectroscopy 20%

• Very Large Array imaging rules out precessing radio jets in three DES-SDSS-selected candidate periodic quasars

  Chen, Y. C., Liu, X., Liao, W. T. & Guo, H., Nov 1 2021, In: Monthly Notices of the Royal Astronomical Society. 507, 3, p. 4638-4645 8 p.

  Research output: Contribution to journal › Article › peer-review

  • Very Large Array (VLA) 100%
  • dark energy 82%
  • quasars 79%
  • periodic variations 43%
  • energy 38%
• 2020

  A Chandra X-Ray Survey of Optically Selected AGN Pairs

  Hou, M., Li, Z. & Liu, X., Sep 1 2020, In: Astrophysical Journal. 900, 1, 79.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • active galactic nuclei 100%
  • merger 68%
  • x rays 43%
  • detection 19%
  • galaxies 15%

• Candidate periodically variable quasars from the Dark Energy Survey and the Sloan Digital Sky Survey

  Chen, Y. C., Liu, X., Liao, W. T., Holgado, A. M., Guo, H., Gruendl, R. A., Morganson, E., Shen, Y., Zhang, K., Abbott, T. M. C., Aguena, M., Allam, S., Avila, S., Bertin, E., Bhargava, S., Brooks, D., Burke, D. L., Carnero Rosell, A., Carollo, D., Carrasco Kind, M., & 45 othersCarretero, J., Costanzi, M., Da Costa, L. N., Davis, T. M., De Vicente, J., Desai, S., Diehl, H. T., Doel, P., Everett, S., Flaugher, B., Friedel, D., Frieman, J., García-Bellido, J., Gaztanaga, E., Glazebrook, K., Gruen, D., Gutierrez, G., Hinton, S. R., Hollowood, D. L., James, D. J., Kim, A. G., Kuehn, K., Kuropatkin, N., Lewis, G. F., Lidman, C., Lima, M., Maia, M. A. G., March, M., Marshall, J. L., Menanteau, F., Miquel, R., Palmese, A., Paz-Chinchón, F., Plazas, A. A., Sanchez, E., Schubnell, M., Serrano, S., Sevilla-Noarbe, I., Smith, M., Suchyta, E., Swanson, M. E. C., Tarle, G., Tucker, B. E., Norbert Varga, T. & Walker, A. R., Dec 1 2020, In: Monthly Notices of the Royal Astronomical Society. 499, 2, p. 2245-2264 20 p.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • dark energy 100%
  • quasars 96%
  • energy 46%
  • light curve 40%
  • detection 33%

• High-redshift Extreme Variability Quasars from Sloan Digital Sky Survey Multiepoch Spectroscopy

  Guo, H., Peng, J., Zhang, K., Burke, C. J., Liu, X., Sun, M., Wang, S., Kong, M., Sheng, Z., Wang, T., He, Z. & Gu, M., Dec 10 2020, In: Astrophysical Journal. 905, 1, 52.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • quasars 100%
  • spectroscopy 83%
  • luminosity 60%
  • accretion 46%
  • fiber 37%

• Optical Variability of the Dwarf AGN NGC 4395 from the Transiting Exoplanet Survey Satellite

  Burke, C. J., Shen, Y., Chen, Y. C., Scaringi, S., Faucher-Giguere, C. A., Liu, X. & Yang, Q., Aug 20 2020, In: Astrophysical Journal. 899, 2, 136.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • extrasolar planets 100%
  • random walk 97%
  • active galactic nuclei 93%
  • light curve 67%
  • background noise 38%

• Spectral energy distributions of candidate periodically variable quasars: Testing the binary black hole hypothesis

  Guo, H., Liu, X., Tayyaba, Z. & Liao, W. T., Feb 1 2020, In: Monthly Notices of the Royal Astronomical Society. 492, 2, p. 2910-2923 14 p.

  Research output: Contribution to journal › Article › peer-review

  • spectral energy distribution 100%
  • quasars 91%
  • energy 44%
  • blazars 41%
  • distribution 32%

• The Curious Case of PHL 293B: A Long-lived Transient in a Metal-poor Blue Compact Dwarf Galaxy

  Burke, C. J., Baldassare, V. F., Liu, X., Foley, R. J., Shen, Y., Palmese, A., Guo, H., Herner, K., Abbott, T. M. C., Aguena, M., Allam, S., Avila, S., Bertin, E., Brooks, D., Carnero Rosell, A., Carrasco Kind, M., Carretero, J., Da Costa, L. N., De Vicente, J., Desai, S., & 33 othersDoel, P., Eifler, T. F., Everett, S., Frieman, J., García-Bellido, J., Gaztanaga, E., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hollowood, D. L., Honscheid, K., James, D. J., Krause, E., Kuehn, K., Maia, M. A. G., Menanteau, F., Miquel, R., Paz-Chinchón, F., Plazas, A. A., Sanchez, E., Santiago, B., Scarpine, V., Serrano, S., Sevilla-Noarbe, I., Smith, M., Soares-Santos, M., Suchyta, E., Swanson, M. E. C., Tarle, G., Tucker, D. L., Varga, T. N. & Walker, A. R., May 1 2020, In: Astrophysical Journal Letters. 894, 1, L5.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • compact galaxies 100%
  • dwarf galaxies 79%
  • metal 42%
  • metals 36%
  • active galactic nuclei 29%

• The Karl G. Jansky very large array sky survey (VLASS). Science case and survey design

  Lacy, M., Baum, S. A., Chandler, C. J., Chatterjee, S., Clarke, T. E., Deustua, S., English, J., Farnes, J., Gaensler, B. M., Gugliucci, N., Hallinan, G., Kent, B. R., Kimball, A., Law, C. J., Lazio, T. J. W., Marvil, J., Mao, S. A., Medlin, D., Mooley, K., Murphy, E. J., & 58 othersMyers, S., Osten, R., Richards, G. T., Rosolowsky, E., Rudnick, L., Schinzel, F., Sivakoff, G. R., Sjouwerman, L. O., Taylor, R., White, R. L., Wrobel, J., Andernach, H., Beasley, A. J., Berger, E., Bhatnager, S., Birkinshaw, M., Bower, G. C., Brandt, W. N., Brown, S., Burke-Spolaor, S., Butler, B. J., Comerford, J., Demorest, P. B., Fu, H., Giacintucci, S., Golap, K., Güth, T., Hales, C. A., Hiriart, R., Hodge, J., Horesh, A., Ivezić, Jarvis, M. J., Kamble, A., Kassim, N., Liu, X., Loinard, L., Lyons, D. K., Masters, J., Mezcua, M., Moellenbrock, G. A., Mroczkowski, T., Nyland, K., O’dea, C. P., O’sullivan, S. P., Peters, W. M., Radford, K., Rao, U., Robnett, J., Salcido, J., Shen, Y., Sobotka, A., Witz, S., Vaccari, M., van Weeren, R. J., Vargas, A., Williams, P. K. G. & Yoon, I., Mar 2020, In: Publications of the Astronomical Society of the Pacific. 132, 1009, 035001.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • survey design 100%
  • Very Large Array (VLA) 97%
  • sky 29%
  • radio astronomy 20%
  • polarimetry 17%

• Understanding Broad Mg II Variability in Quasars with Photoionization: Implications for Reverberation Mapping and Changing-look Quasars

  Guo, H., Shen, Y., He, Z., Wang, T., Liu, X., Wang, S., Sun, M., Yang, Q., Kong, M. & Sheng, Z., Jan 10 2020, In: Astrophysical Journal. 888, 2, 58.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • reverberation 100%
  • quasars 88%
  • photoionization 84%
  • luminosity 53%
  • breathing 49%

• Varstrometry for Off-nucleus and Dual Subkiloparsec AGN (VODKA): Methodology and Initial Results with Gaia DR2

  Hwang, H. C., Shen, Y., Zakamska, N. & Liu, X., Jan 10 2020, In: Astrophysical Journal. 888, 2, 73.

  Research output: Contribution to journal › Article › peer-review

  • active galactic nuclei 100%
  • methodology 78%
  • nuclei 62%
  • quasars 39%
  • sky 37%
• 2019

  Active Galactic Nucleus Pairs from the Sloan Digital Sky Survey. III. Chandra X-Ray Observations Unveil Obscured Double Nuclei

  Hou, M., Liu, X., Guo, H., Li, Z., Shen, Y. & Green, P. J., Sep 1 2019, In: Astrophysical Journal. 882, 1, 41.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • active galactic nuclei 100%
  • luminosity 70%
  • nuclei 62%
  • merger 49%
  • x rays 43%

• An Unusual Mid-infrared Flare in a Type 2 AGN: An Obscured Turning-on AGN or Tidal Disruption Event?

  Yang, Q., Shen, Y., Liu, X., Wu, X. B., Jiang, L., Shangguan, J., Graham, M. J. & Yao, S., Nov 10 2019, In: Astrophysical Journal. 885, 2, 110.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • flares 100%
  • luminosity 80%
  • Wide-field Infrared Survey Explorer 69%
  • dust 62%
  • explosion 31%

• A Trio of Massive Black Holes Caught in the Act of Merging

  Liu, X., Hou, M., Li, Z., Nyland, K., Guo, H., Kong, M., Shen, Y., Wrobel, J. M. & Peng, S., Dec 10 2019, In: Astrophysical Journal. 887, 1, 90.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • merger 100%
  • spectroscopy 67%
  • galaxies 58%
  • stellar cores 56%
  • nuclei 51%

• Constraining sub-parsec binary supermassive black holes in quasars with multi-epoch spectroscopy – III. Candidates from continued radial velocity tests

  Guo, H., Liu, X., Shen, Y., Loeb, A., Monroe, T. & Prochaska, J. X., Jan 21 2019, In: Monthly Notices of the Royal Astronomical Society. 482, 3, p. 3288-3307 20 p.

  Research output: Contribution to journal › Article › peer-review

  • radial velocity 100%
  • quasars 99%
  • spectroscopy 83%
  • time measurement 78%
  • shift 49%

• Deblending and classifying astronomical sources with Mask R-CNN deep learning

  Burke, C. J., Aleo, P. D., Chen, Y. C., Liu, X., Peterson, J. R., Sembroski, G. H. & Lin, J. Y. Y., Dec 1 2019, In: Monthly Notices of the Royal Astronomical Society. 490, 3, p. 3952-3965 14 p.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • classifying 100%
  • learning 96%
  • masks 75%
  • galaxies 48%
  • telescopes 33%

• Discovery of an Mg II Changing-look Active Galactic Nucleus and Its Implications for a Unification Sequence of Changing-look Active Galactic Nuclei

  Guo, H., Sun, M., Liu, X., Wang, T., Kong, M., Wang, S., Sheng, Z. & He, Z., Oct 1 2019, In: Astrophysical Journal Letters. 883, 2, L44.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • active galactic nuclei 100%
  • indicator 58%
  • continuums 21%
  • emitters 16%
  • photoionization 9%

• Enabling real-time multi-messenger astrophysics discoveries with deep learning

  Huerta, E. A., Allen, G., Andreoni, I., Antelis, J. M., Bachelet, E., Berriman, G. B., Bianco, F. B., Biswas, R., Carrasco kind, M., Chard, K., Cho, M., Cowperthwaite, P. S., Etienne, Z. B., Fishbach, M., Forster, F., George, D., Gibbs, T., Graham, M., Gropp, W., Gruendl, R., & 40 othersGupta, A., Haas, R., Habib, S., Jennings, E., Johnson, M. W. G., Katsavounidis, E., Katz, D. S., Khan, A., Kindratenko, V., Kramer, W. T. C., Liu, X., Mahabal, A., Marka, Z., Mchenry, K., Miller, J. M., Moreno, C., Neubauer, M. S., Oberlin, S., Olivas, A. R., Petravick, D., Rebei, A., Rosofsky, S., Ruiz, M., Saxton, A., Schutz, B. F., Schwing, A., Seidel, E., Shapiro, S. L., Shen, H., Shen, Y., Singer, L. P., Sipocz, B. M., Sun, L., Towns, J., Tsokaros, A., Wei, W., Wells, J., Williams, T. J., Xiong, J. & Zhao, Z., Oct 1 2019, In: Nature Reviews Physics. 1, 10, p. 600-608 9 p.

  Research output: Contribution to journal › Article › peer-review

  • learning 100%
  • astrophysics 79%
  • recommendations 72%
  • gravitational waves 67%
  • machine learning 58%

• Varstrometry for Off-nucleus and Dual Sub-Kpc AGN (VODKA): How Well Centered Are Low-z AGN?

  Shen, Y., Hwang, H. C., Zakamska, N. & Liu, X., Nov 1 2019, In: Astrophysical Journal Letters. 885, 1, L4.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • active galactic nuclei 100%
  • nuclei 62%
  • coalescence 51%
  • recoilings 16%
  • astrometry 15%
• 2018

  A Candidate Tidal Disruption Event in a Quasar at z = 2.359 from Abundance Ratio Variability

  Liu, X., Dittmann, A., Shen, Y. & Jiang, L., May 20 2018, In: The Astrophysical journal. 859, 1, p. 8 8.

  Research output: Contribution to journal › Article › peer-review

  • quasars 100%
  • nitrogen 59%
  • ionization 32%
  • stars 22%
  • carbon 22%

• Hubble Space Telescope Wide Field Camera 3 Identifies an r_p = 1 Kpc Dual Active Galactic Nucleus in the Minor Galaxy Merger SDSS J0924+0510 at z = 0.1495

  Liu, X., Guo, H., Shen, Y., Greene, J. E. & Strauss, M. A., Jul 20 2018, In: The Astrophysical journal. 862, 1, p. 29 29.

  Research output: Contribution to journal › Article › peer-review

  • merger 100%
  • Hubble Space Telescope 84%
  • active galactic nuclei 81%
  • cameras 62%
  • galaxies 58%

• Pulsar timing constraints on the Fermi massive black hole binary blazar population

  Holgado, A. M., Sesana, A., Sandrinelli, A., Covino, S., Treves, A., Liu, X. & Ricker, P. M., Nov 21 2018, In: Monthly Notices of the Royal Astronomical Society: Letters. 481, 1, p. L74-L78 5 p.

  Research output: Contribution to journal › Article › peer-review

  • blazars 100%
  • pulsars 82%
  • time measurement 65%
  • luminosity 50%
  • BL Lacertae objects 49%

• Very Long Baseline Array Imaging of Type-2 Seyferts with Double-peaked Narrow Emission Lines: Searches for Sub-kpc Dual AGNs and Jet-powered Outflows

  Liu, X., Lazio, T. J. W., Shen, Y. & Strauss, M. A., Feb 20 2018, In: Astrophysical Journal. 854, 2, 169.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • Very Long Baseline Array (VLBA) 100%
  • active galactic nuclei 69%
  • outflow 61%
  • angular resolution 28%
  • galaxies 19%
• 2017

  PHL 6625: A Minor Merger-associated QSO Behind NGC 247

  Tao, L., Feng, H., Shen, Y., Ho, L. C., Ge, J., Kaaret, P., Mao, S. & Liu, X., Jun 1 2017, In: The Astrophysical journal. 841, 2, 118.

  Research output: Contribution to journal › Article › peer-review

  • merger 100%
  • galaxies 58%
  • arcs 33%
  • gravitational lenses 26%
  • Hubble Space Telescope 21%
• 2016

  A high fraction of double-peaked narrow emission lines in powerful active galactic nuclei

  Lyu, Y. & Liu, X., Nov 21 2016, In: Monthly Notices of the Royal Astronomical Society. 463, 1, p. 24-36 13 p.

  Research output: Contribution to journal › Article › peer-review

  • active galactic nuclei 100%
  • luminosity 70%
  • outflow 35%
  • ionized gases 12%
  • gas 9%

• Chandra X-ray and hubble space telescope imaging of optically selected kiloparsec-scale binary active galactic nuclei. II. Host galaxy morphology and AGN activity

  Shangguan, J., Liu, X., Ho, L. C., Shen, Y., Peng, C. Y., Greene, J. E. & Strauss, M. A., May 20 2016, In: Astrophysical Journal. 823, 1, 50.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • merger 100%
  • Hubble Space Telescope 84%
  • active galactic nuclei 81%
  • galaxies 58%
  • x rays 35%
• 2014

  Constraining sub-parsec binary supermassive black holes in quasars with multi-epoch spectroscopy. II. the population with kinematically offset broad balmer emission lines

  Liu, X., Shen, Y., Bian, F., Loeb, A. & Tremaine, S., Jul 10 2014, In: Astrophysical Journal. 789, 2, 140.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • quasars 100%
  • spectroscopy 83%
  • time measurement 79%
  • H lines 73%
  • orbitals 35%

• Gemini long-slit observations of luminous obscured quasars: Further evidence for an upper limit on the size of the narrow-line region

  Hainline, K. N., Hickox, R. C., Greene, J. E., Myers, A. D., Zakamska, N. L., Liu, G. & Liu, X., May 20 2014, In: Astrophysical Journal. 787, 1, 65.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • quasars 100%
  • slits 92%
  • luminosity 60%
  • erg 33%
  • cosmology 18%

• Relativistic redshifts in quasar broad lines

  Tremaine, S., Shen, Y., Liu, X. & Loeb, A., Oct 10 2014, In: Astrophysical Journal. 794, 1, 49.

  Research output: Contribution to journal › Article › peer-review

  • quasars 100%
  • line of sight 39%
  • outflow 29%
  • H lines 29%
  • relativistic effects 22%