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Research Output 2005 2019

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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

active galactic nuclei
nuclei
luminosity
x rays
merger

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

radial velocity
quasars
spectroscopy
time measurement
shift

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

active galactic nuclei
power law
extinction
dust
timescale
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

quasars
nitrogen
carbon
ionization
timescale
Hubble Space Telescope
active galactic nuclei
merger
cameras
galaxies

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

blazars
pulsars
BL Lacertae objects
time measurement
radio

Slip statistics for a bulk metallic glass composite reflect its ductility

Wright, W. J., Long, A. A., Gu, X., Liu, X., Hufnagel, T. C. & Dahmen, K. A., Nov 14 2018, In : Journal of Applied Physics. 124, 18, 185101.

Research output: Contribution to journalArticle

metallic glasses
ductility
slip
statistics
composite materials
Very Long Baseline Array (VLBA)
active galactic nuclei
outflow
radio
angular resolution
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

active galactic nuclei
outflow
luminosity
oscillation
ionized gases

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

Hubble Space Telescope
active galactic nuclei
merger
galaxies
x rays
2014
quasars
spectroscopy
time measurement
H lines
orbitals

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

quasars
slits
luminosity
erg
flattening

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

quasars
line of sight
H lines
inflow
outflow
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

Hubble Space Telescope
active galactic nuclei
x rays
gas
merger
quasars
spectroscopy
time measurement
shift
H lines

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

ionized gases
nebulae
quasars
radio
gas

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

ionized gases
nebulae
quasars
kinematics
radio
2012
active galactic nuclei
star formation
accretion
galaxies
luminosity

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

estimators
quasars
time measurement
luminosity
near infrared
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

Jupiter (planet)
Jupiter
planets
planet
stars

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

active galactic nuclei
merger
galaxies
gas
line of sight

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

wreck
active galactic nuclei
merger
train
galaxies
active galactic nuclei
kinematics
near infrared
spectroscopy
slits
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

active galactic nuclei
slits
near infrared
merger
line of sight

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

active galactic nuclei
kinematics
line of sight
radio spectroscopy
luminosity
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

quasars
galaxies
wolves
luminosity
interacting galaxies

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, 1 p.

Research output: Contribution to journalArticle

infant

Host Galaxies of Obscured Quasars: Infant Starbursts Caught in Action

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

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

active galaxies
galaxies
stars
merger
elliptical galaxies
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

metallicity
galaxies
stars
H II regions
stellar mass

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

planets
planet
heating
radii
opacity
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

Microwave Anisotropy Probe
cross correlation
wavelet
anisotropy
probe
2005
microwave probes
wavelet
Microwave Anisotropy Probe
probe
sky

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

magnetohydrodynamics
perturbation
power law
force-free magnetic fields
magnetic field