Evolution of Elliptical Galaxies at z 1 Revealed from a Large, Multicolor Sample of Extremely Red Objects ∗
Evolution of Elliptical Galaxies at z 1 Revealed from a Large, Multicolor Sample of Extremely Red Objects ∗
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DOI：
10.1093/pasj/55.6.1079
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发表时间：
2002-10
影响因子：
2.3
通讯作者：
Masayuki Miyazaki;K. Shimasaku;T. Kodama;S. Okamura;H. Furusawa;M. Ouchi;F. Nakata;M. Doi;M. Hamabe;M. Kimura;Y. Komiyama;S. Miyazaki;C. Nagashima;T. Nagata;T. Nagayama;Y. Nakajima;H. Nakaya;A. Pickles;S. Sato;K. Sekiguchi;M. Sekiguchi;K. Sugitani;T. Takata;Motohide Tamura;M. Yagi;N. Yasuda
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文献类型：
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作者：
Masayuki Miyazaki;K. Shimasaku;T. Kodama;S. Okamura;H. Furusawa;M. Ouchi;F. Nakata;M. Doi;M. Hamabe;M. Kimura;Y. Komiyama;S. Miyazaki;C. Nagashima;T. Nagata;T. Nagayama;Y. Nakajima;H. Nakaya;A. Pickles;S. Sato;K. Sekiguchi;M. Sekiguchi;K. Sugitani;T. Takata;Motohide Tamura;M. Yagi;N. Yasuda
利用Subaru望远镜和UH 2.2m望远镜在Subaru/XMM-Newton深场114 arcmin 2区域的BV R izJHK s轨道数据构造了247个R-Ks ≥ 3.35（AB）和Ks ≤ 22.1（AB）的极红天体（ERO）样本，研究了椭圆星系atz 1的演化.通过拟合老星系（OG）和年轻的，尘埃星暴（DS）的模板光谱的观测数据，我们将ERO分为这两类，并估计它们的红移。我们发现，在我们的样本中，58%的ERO属于OG类，并且这些OG在任何红移处都具有广泛的颜色范围。我们推导出了在z = 1-1时，我们的样本中OG的静止坐标系B带光度函数。5a nd 1.5-2.5，发现服从被动演化的星系数密度在z 1.5处下降三倍或更多。OGs的空间相关长度估计为r 0 8 h −1 Mpc，与现今类似光度的早型星系相当或更大。我们还讨论了我们的数据中DS的性质。
We studied the evolution of elliptical galaxies atz 1 using a sample of 247 Extremely Red Objects (EROs) with R − Ks ≥ 3.35 (AB) and Ks ≤ 22.1 (AB) constructed from BV R izJHK s multicolor data of a 114arcmin 2 area in the Subaru/XMM-Newton Deep Field taken with the Subaru Telescope and the UH 2.2m telescope. By fitting template spectra of old galaxies (OGs) and young, dusty starbursts (DSs) to the multicolor data, we classified EROs into these two classes and estimated their redshifts. We found that 58% of the EROs in our sample belong to the OG class and that these OGs have a wide range of colors at any redshift. We derived rest-frame B-band luminosity functions of OGs in our sample at z = 1-1. 5a nd 1.5-2.5, and found that the number density of galaxies obeying passive evolution drops at z 1.5 by a factor of three or more. The spatial correlation length of OGs is estimated to be r0 8 h −1 Mpc, which is comparable to, or larger than, those of present-day early-type galaxies of similar luminosities. We also discussed properties of DSs in our data.