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2020

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 journalArticle

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 journalArticle

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 journalArticle

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 journalArticle

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 journalArticle

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 journalArticle

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 1 2019, In : Monthly Notices of the Royal Astronomical Society. 482, 3, p. 3288-3307 20 p.

Research output: Contribution to journalArticle

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 journalArticle

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 journalArticle

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 others, Gupta, 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 journalArticle

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 journalArticle

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

Research output: Contribution to journalArticle

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 journalArticle

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., 2017, In : The Astrophysical journal. 841, 118

Research output: Contribution to journalArticle

2016

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

Lyu, Y. & Liu, X., Jan 1 2016, In : Monthly Notices of the Royal Astronomical Society. 463, 1, p. 1-14 14 p.

Research output: Contribution to journalArticle

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 journalArticle

2014

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 journalArticle

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 journalArticle

2013

Chandra X-ray and Hubble Space Telescope imaging of optically selected Kiloparsec-scale binary active galactic nuclei. I. Nature of the nuclear ionizing sources

Liu, X., Civano, F., Shen, Y., Green, P., Greene, J. E. & Strauss, M. A., Jan 10 2013, In : Astrophysical Journal. 762, 2, 110.

Research output: Contribution to journalArticle

Observations of feedback from radio-quiet quasars - I. Extents and morphologies of ionized gas nebulae

Liu, G., Zakamska, N. L., Greene, J. E., Nesvadba, N. P. H. & Liu, X., May 2 2013, In : Monthly Notices of the Royal Astronomical Society. 430, 3, p. 2327-2345 19 p.

Research output: Contribution to journalArticle

Observations of feedback from radio-quiet quasars - II. kinematics of ionized gas nebulae

Liu, G., Zakamska, N. L., Greene, J. E., Nesvadba, N. P. H. & Liu, X., Dec 1 2013, In : Monthly Notices of the Royal Astronomical Society. 436, 3, p. 2576-2597 22 p.

Research output: Contribution to journalArticle

2012

Comparing single-epoch virial black hole mass estimators for luminous quasars

Shen, Y. & Liu, X., Jul 10 2012, In : Astrophysical Journal. 753, 2, 125.

Research output: Contribution to journalArticle

2011

A comparison of spectroscopic methods for detecting the starlight scattered by transiting hot Jupiters, with an application to Subaru data for HD 209458b and HD 189733b

Langford, S. V., Wyithe, J. S. B., Turner, E. L., Jenkins, E. B., Narita, N., Liu, X., Suto, Y. & Yamada, T., Jul 1 2011, In : Monthly Notices of the Royal Astronomical Society. 415, 1, p. 673-686 14 p.

Research output: Contribution to journalArticle

Active galactic nucleus pairs from the Sloan Digital Sky Survey. I. the frequency on 5-100kpc scales

Liu, X., Shen, Y., Strauss, M. A. & Hao, L., Aug 20 2011, In : Astrophysical Journal. 737, 2, 101.

Research output: Contribution to journalArticle

Cosmic train wreck by massive black holes: Discovery of a kiloparsec-scale triple active galactic nucleus

Liu, X., Shen, Y. & Strauss, M. A., Jul 20 2011, In : Astrophysical Journal Letters. 736, 1, L7.

Research output: Contribution to journalArticle

2010

Discovery of four kpc-scale binary active galactic nuclei

Liu, X., Greene, J. E., Shen, Y. & Strauss, M. A., Jan 1 2010, In : Astrophysical Journal Letters. 715, 1 PART 2, p. L30-L34

Research output: Contribution to journalArticle

Type 2 active galactic nuclei with double-peaked [O III] Lines: Narrow-line region kinematics or merging supermassive black hole pairs?

Liu, X., Shen, Y., Strauss, M. A. & Greene, J. E., Jan 1 2010, In : Astrophysical Journal. 708, 1, p. 427-434 8 p.

Research output: Contribution to journalArticle

2009

Host galaxies of luminous type 2 quasars AT z 0.5

Liu, X., Zakamska, N. L., Greene, J. E., Strauss, M. A., Krolik, J. H. & Heckman, T. M., Jan 1 2009, In : Astrophysical Journal. 702, 2, p. 1098-1117 20 p.

Research output: Contribution to journalArticle

Host galaxies of obscured quasars: Infant starbursts caught in action

Liu, X., Zakamska, N. L., Greene, J. E., Strauss, M. A., Krolik, J. H. & Heckman, T. M., Aug 1 2009, In : Proceedings of the International Astronomical Union. 5, S267, p. 118 1 p.

Research output: Contribution to journalArticle

The growth of black holes: Insights from obscured active galaxies

Greene, J. E., Zakamska, N. L., Liu, X., Barth, A. J. & Ho, L. C., Jan 1 2009, In : Astrophysical Journal. 702, 1, p. 441-459 19 p.

Research output: Contribution to journalArticle

2008

Metallicities and physical conditions in star-forming galaxies at z ∼ 1.0-1.5

Liu, X., Shapley, A. E., Coil, A. L., Brinchmann, J. & Ma, C. P., May 10 2008, In : Astrophysical Journal. 678, 2, p. 758-779 22 p.

Research output: Contribution to journalArticle

Theoretical radii of extrasolar giant planets: The cases of TrES-4, XO-3b, and HAT-P-1b

Liu, X., Burrows, A. & Ibgui, L., Nov 10 2008, In : Astrophysical Journal. 687, 2, p. 1191-1200 10 p.

Research output: Contribution to journalArticle

2006

A cross-correlation analysis of WMAP and egret data in wavelet space

Liu, X. & Zhang, S. N., Jan 1 2006, In : Astrophysical Journal. 636, 1 II, p. L1-L4

Research output: Contribution to journalArticle

2005

Structures in a class of magnetized scale-free discs

Shen, Y., Liu, X. & Lou, Y. Q., Feb 1 2005, In : Monthly Notices of the Royal Astronomical Society. 356, 4, p. 1333-1356 24 p.

Research output: Contribution to journalArticle