197 citations · 2.4k across the 71 of their papers we have counts for
7 papers · 1 filter
Galaxy and Quasar Fueling Caught in the Act from the Intragroup to the Interstellar Medium
Sean D. Johnson, Hsiao-Wen Chen, Lorrie A. Straka +11
We report the discovery of six spatially extended (10-100 kpc) line-emitting nebulae in the z=0.57 galaxy group hosting PKS0405-123, one of the most luminous quasars at z<1. The di…
The largest M dwarfs flares from ASAS-SN
Sarah J. Schmidt, Benjamin J. Shappee, Jennifer L. van Saders +13
The All-Sky Automated Survey for Supernovae (ASAS-SN) is the only project in existence to scan the entire sky in optical light every day, reaching a depth of mag. O…
Characterizing Circumgalactic Gas around Massive Ellipticals at z~0.4 - II. Physical Properties and Elemental Abundances
Fakhri S. Zahedy, Hsiao-Wen Chen, Sean D. Johnson +5
We present a systematic investigation of the circumgalactic medium (CGM) within projected distances d<160 kpc of luminous red galaxies (LRGs). The sample comprises 16 intermediate-…
Characterizing Circumgalactic Gas around Massive Ellipticals at z ~ 0.4 I. Initial Results
Hsiao-Wen Chen, Fakhri S. Zahedy, Sean D. Johnson +4
We present a new Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) absorption-line survey to study halo gas around 16 luminous red galaxies (LRGs) at z=0.21-0.55. The…
On the limitations of statistical absorption studies with the Sloan Digital Sky Surveys I--III
Ting-Wen Lan, Brice Ménard, Dalya Baron +4
We investigate the limitations of statistical absorption measurements with the SDSS optical spectroscopic surveys. We show that changes in the data reduction strategy throughout di…
Imaging Extended Emission-Line Regions of Obscured AGN with the Subaru Hyper Suprime-Cam Survey
Ai-Lei Sun, Jenny E. Greene, Nadia L. Zakamska +9
Narrow-line regions excited by active galactic nuclei (AGN) are important for studying AGN photoionization and feedback. Their strong [O III] lines can be detected with broadband i…