학술논문
First HETDEX Spectroscopic Determinations of Ly$\alpha$ and UV Luminosity Functions at $z=2-3$: Bridging a Gap Between Faint AGN and Bright Galaxies
Document Type
Working Paper
Author
Zhang, Yechi; Ouchi, Masami; Gebhardt, Karl; Cooper, Erin Mentuch; Liu, Chenxu; Davis, Dustin; Jeong, Donghui; Farrow, Daniel J.; Finkelstein, Steven L.; Gawiser, Eric; Hill, Gary J.; Harikane, Yuichi; Kakuma, Ryota; Acquaviva, Viviana; Casey, Caitlin M.; Fabricius, Maximilian; Hopp, Ulrich; Jarvis, Matt J.; Landriau, Martin; Mawatari, Ken; Mukae, Shiro; Ono, Yoshiaki; Sakai, Nao; Schneider, Donald P.
Source
Subject
Language
Abstract
We present Ly$\alpha$ and ultraviolet-continuum (UV) luminosity functions (LFs) of galaxies and active galactic nuclei (AGN) at $z=2.0-3.5$ determined by the un-targetted optical spectroscopic survey of the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). We combine deep Subaru imaging with HETDEX spectra resulting in $11.4$ deg$^2$ of fiber-spectra sky coverage, obtaining $18320$ galaxies spectroscopically identified with Ly$\alpha$ emission, $2126$ of which host type 1 AGN showing broad (FWHM$~>1000$ km s$^{-1}$) Ly$\alpha$ emission lines. We derive the Ly$\alpha$ (UV) LF over 2 orders of magnitude covering bright galaxies and AGN in $\log L_\mathrm{Ly\alpha}/\mathrm{[erg~s^{-1}]}=43.3-45.5$ ($-27-21$) type 1 AGN increases from $z\sim2$ to $z\sim0$ as opposed to the evolution of bright ($M_\mathrm{UV}<-21$) type 1 AGN, suggesting the AGN downsizing in the rest-frame UV luminosity.
Comment: 27 pages, 19 figures, accepted for publication in ApJ
Comment: 27 pages, 19 figures, accepted for publication in ApJ