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arXiv 1903.07573astro-ph.GA
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$z \sim 2$宇宙的星系I.光栅选择静止框架光发射谱线检流计

Galaxies of the $z \sim 2$ Universe. I. Grism-Selected Rest-Frame Optical Emission Line Galaxies

William P. Bowman, Gregory R. Zeimann, Robin Ciardullo, Caryl Gronwall, Donald P. Schneider, Adam P. McCarron, Laurel H. Weiss, Guang Yang, Alex Hagen

摘要:

欧几里德、WFIRST和HETDEX将使发射线选择星系成为$z > 1$宇宙中最大的观测组成部分。然而,我们只有一个有限的了解星系的物理性质选择通过他们的Ly $α$或休息帧光发射线。为了开始解决这个问题,我们提出的基本性质的$\sim 2,000$天盾,宇宙,GOODS-N,GOODS-S,和UDS星系的红移范围内$1.90 < z < 2.35$通过他们的[O II],H $β$,和[O III]发射线。对于这些$z \sim 2$星系,[O III]通常比[O II]和H $β$亮得多,典型的静止坐标系等效宽度为几百埃。此外,这些强发射线系统的恒星质量($\sim 3$ dex)、恒星形成速率($\sim 2$ dex)和[O III]光度($\sim 2$ dex)的范围非常广。比较这些属性的连续选择星系的分布,我们发现,发射线星系有系统地较低的恒星质量和较低的光学/紫外尘埃衰减。这些测量奠定了基础,这些休息帧光发射线星系和LY $α$在HETDEX调查中确定的发射器之间的广泛比较。

英文摘要:

Euclid, WFIRST, and HETDEX will make emission-line selected galaxies the largest observed constituent in the $z > 1$ universe. However, we only have a limited understanding of the physical properties of galaxies selected via their Ly$α$ or rest-frame optical emission lines. To begin addressing this problem, we present the basic properties of $\sim 2,000$ AEGIS, COSMOS, GOODS-N, GOODS-S, and UDS galaxies identified in the redshift range $1.90 < z < 2.35$ via their [O II], H$β$, and [O III] emission lines. For these $z \sim 2$ galaxies, [O III] is generally much brighter than [O II] and H$β$, with typical rest-frame equivalent widths of several hundred Angstroms. Moreover, these strong emission-line systems span an extremely wide range of stellar mass ($\sim 3$ dex), star-formation rate ($\sim 2$ dex), and [O III] luminosity ($\sim 2$ dex). Comparing the distributions of these properties to those of continuum selected galaxies, we find that emission-line galaxies have systematically lower stellar masses and lower optical/UV dust attenuations. These measurements lay the groundwork for an extensive comparison between these rest-frame optical emission-line galaxies and Ly$α$ emitters identified in the HETDEX survey.

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