分类： 天文学 >> 天文学 提交时间： 2023-02-19
Yechi Zhang
Masami Ouchi
Karl Gebhardt
Erin Mentuch Cooper
Chenxu Liu
Dustin Davis
Donghui Jeong
Daniel J. Farrow
Steven L. Finkelstein
Eric Gawiser
Gary J. Hill
Yuichi Harikane
Ryota Kakuma
Viviana Acquaviva
Caitlin M. Casey
Maximilian Fabricius
Ulrich Hopp
Matt J. Jarvis
Martin Landriau
Ken Mawatari
摘要： 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.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Erin Mentuch Cooper
Karl Gebhardt
Dustin Davis
Daniel J. Farrow
Chenxu Liu
Gregory Zeimann
Robin Ciardullo
John J. Feldmeier
Niv Drory
Donghui Jeong
Barbara Benda
William P. Bowman
Michael Boylan-Kolchin
Oscar A. Chavez Ortiz
Maya H. Debski
Mona Dentler
Maximilian Fabricius
Rameen Farooq
Steven L. Finkelstein
Eric Gawiser
摘要： We present the first publicly released catalog of sources obtained from the
Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). HETDEX is an integral
field spectroscopic survey designed to measure the Hubble expansion parameter
and angular diameter distance at 1.88
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Dustin Davis
Karl Gebhardt
Erin Mentuch Cooper
Robin Ciardullo
Maximilian Fabricius
Daniel J. Farrow
John J. Feldmeier
Steven L. Finkelstein
Eric Gawiser
Caryl Gronwall
Gary J. Hill
Ulrich Hopp
Lindsay R. House
Donghui Jeong
Wolfram Kollatschny
Eiichiro Komatsu
Martin Landriau
Chenxu Liu
Shun Saito
Sarah Tuttle
摘要： The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is an untargeted spectroscopic survey that aims to measure the expansion rate of the Universe at $z \sim 2.4$ to 1% precision for both $H(z)$ and $D_A(z)$. HETDEX is in the process of mapping in excess of one million Lyman Alpha emitting (LAE) galaxies and a similar number of lower-z galaxies as a tracer of the large-scale structure. The success of the measurement is predicated on the post-observation separation of galaxies with Ly$\alpha$ emission from the lower-$z$ interloping galaxies, primarily [OII], with low contamination and high recovery rates. The Emission Line eXplorer (ELiXer) is the principal classification tool for HETDEX, providing a tunable balance between contamination and completeness as dictated by science needs. By combining multiple selection criteria, ELiXer improves upon the 20 Angstrom rest-frame equivalent width cut commonly used to distinguish LAEs from lower-$z$ [OII] emitting galaxies. Despite a spectral resolving power, R $\sim800$, that cannot resolve the [OII] doublet, we demonstrate the ability to distinguish LAEs from foreground galaxies with 98.1% accuracy. We estimate a contamination rate of Ly$\alpha$ by [OII] of 1.2% and a Ly$\alpha$ recovery rate of 99.1% using the default ELiXer configuration. These rates meet the HETDEX science requirements.
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