Star Formation in Galaxies between Redshifts of 0.7 and 1.8
Star Formation in Galaxies between Redshifts of 0.7 and 1.8
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红移介于 0.7 和 1.8 之间的星系中的恒星形成
DOI：
10.1086/316857
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
A. Szalay
中科院分区：
文献类型：
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作者：
Andrew M. Hopkins;A. Connolly;A. Szalay
本文利用近红外相机和多目标光谱仪（NICMOS）棱镜光谱观测，分析了红移在0.7 < z < 1.8范围内星系的星星形成率。我们在163个星系中探测到了14.4弧分~ 2的H α辐射，其中37个可能有Hα辐射。我们将观测到的Hα光度函数（LF）在这个红移范围内扩展到比早期工作弱2倍的光度，并且在重叠区域是一致的。使用Hα LF，我们估计了一个星星形成率（SFR）密度在这个红移范围0.166兆年-1兆秒差距-3（H 0 = 75公里秒-1兆秒差距-1），与其他估计的基础上的发射线和支持的数量级增加，在z = 0和z = 1之间的SFR密度。我们对SFR密度的测量值比从紫外数据估计的值大1.2 -3倍，与当地观察到的因子相当，这意味着紫外和Hα之间的相对关系在z = 1.3时几乎没有变化。
We present an analysis of the star formation rate in galaxies with redshifts in the range 0.7 < z < 1.8 using Near Infrared Camera and Multi-Object Spectrograph (NICMOS) grism spectral observations. We detect 163 galaxies in an area of ∼4.4 arcmin2, 37 of which show possible Hα emission. We extend the observed Hα luminosity function (LF) in this redshift range to luminosities a factor of 2 fainter than earlier work and are consistent in the region of overlap. Using the Hα LF, we estimate a star formation rate (SFR) density in this redshift range of 0.166 M⊙ yr-1 Mpc-3 (H0 = 75 km s-1 Mpc-1), consistent with other estimates based on emission lines and supporting the order-of-magnitude increase in SFR density between z = 0 and z = 1. Our measurement of SFR density is a factor of ≈2–3 greater than that estimated from UV data, comparable to the factor observed locally, implying little evolution in the relative extinctions between UV and Hα out to z ≈ 1.3.