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214 papers
Improved Redshifts for DESI EDR Quasars
Qiaoya Wu, Yue Shen
The Dark Energy Spectroscopic Instrument (DESI) survey will provide optical spectra for million quasars. Accurate redshifts for these quasars will facilitate a broad range…
Varstrometry for Off-nucleus and Dual Sub-kpc AGN (VODKA): Very Long Baseline Array Searches for Dual or Off-nucleus Quasars and Small-scale Jets
Yu-Ching Chen, Xin Liu, Joseph Lazio +5
Dual and off-nucleus active supermassive black holes are expected to be common in the hierarchical structure formation paradigm, but their identification at parsec scales remains a…
Discovery and Characterization of Galactic-scale Dual Supermassive Black Holes Across Cosmic Time
Yue Shen, J. Andrew Casey-Clyde, Yu-Ching Chen +10
The hierarchical structure formation paradigm predicts the formation of pairs of supermassive black holes in merging galaxies. When both (or one) members of the SMBH pair are unobs…
Varstrometry for Off-nucleus and Dual sub-Kpc AGN (VODKA): Investigating the Nature of J0823+2418 at : a Likely Lensed Quasar
Arran C. Gross, Yu-Ching Chen, Adi Foord +8
Dual quasars at small physical separations are an important precursor phase of galaxy mergers, ultimately leading to the coalescence of the two supermassive black holes. Starting f…
Varstrometry for Off-nucleus and Dual sub-Kpc AGN (VODKA). SDSS J1608+2716: A Sub-arcsec Quadruply Lensed Quasar at z=2.575
Junyao Li, Xin Liu, Yue Shen +5
We report Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) deep IR (F160W) imaging of SDSS J1608+2716. This system, located at a redshift of z=2.575, was recently reported a…
The eROSITA Final Equatorial Depth Survey (eFEDS): Complex absorption and soft excesses in hard X-ray--selected active galactic nuclei
Sophia G. H. Waddell, Kirpal Nandra, Johannes Buchner +14
Context. The soft excess, a surplus of X-ray photons above 2 keV with respect to a power law, is a feature of debated physical origin found in the X-ray spectra of many type-1 acti…