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Evolution of Elliptical Galaxies at $z \gtrsim 1$ Revealed from a Large, Multicolor Sample of Extremely Red Objects

Masayuki Miyazaki, Kazuhiro Shimasaku, Tadayuki Kodama, Sadanori Okamura, Hisanori Furusawa, Masami Ouchi, Fumiaki Nakata, Mamoru Doi, Masaru Hamabe, Masahiko Kimura, Yutaka Komiyama, Satoshi Miyazaki (+14 others)
2003 Nippon Tenmon Gakkai obun kenkyu hokoku  

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2002 pre-print
arXiv:astro-ph/0210509v1 fatcat:53amjnoxuvbpfa2wl2sunuchty
We study the evolution of elliptical galaxies at z > 1 on the basis of a sample of 247 Extremely Red Objects (EROs) with R-Ks >= 3.35 (AB) and Ks <= 22.1 (AB) constructed from BVRi'z'JHKs multicolor data of a 114 arcmin2 area in the Subaru/XMM Deep Survey Field. By fitting template spectra of old ellipticals (OEs) and young, dusty starbursts (DSs) to the multicolor data, we classify EROs into these two classes and estimate their redshifts. We find that 58 are fit by a spectrum having a disk
more » ... onent with the B-band bulge-to-total luminosity ratio of <= 0.9. We compare the observed surface density of OEs with predictions from passive evolution models. We then derive rest-frame B-band luminosity functions (LFs) of OEs in our sample at z=1-1.5 and 1.5-2.5. We find that the LF at z=1-1.5 roughly agrees with the LF of local ellipticals if a dimming of 1.3 mag from z=1.25 to the present epoch is assumed. On the other hand, the amplitude of the LF at z=1.5-2.5 is found to be lower than that of the local LF by a factor of 3 over the whole range of magnitude observed. Taking account of a strong decrease in the number density of morphologically classified early-type galaxies at z > 1.5 found by several authors, we conclude that the majority of ellipticals seen at present have not established either a red color or a smooth 1/4-law profile before z 1.5. (abridged)
doi:10.1093/pasj/55.6.1079 fatcat:vgeol2mujbb4vfsod3tbvhzlmm
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Citation

Masayuki Miyazaki, Kazuhiro Shimasaku, Tadayuki Kodama, Sadanori Okamura, Hisanori Furusawa, Masami Ouchi, Fumiaki Nakata, Mamoru Doi, Masaru Hamabe, Masahiko Kimura, Yutaka Komiyama, Satoshi Miyazaki, Chie Nagashima, Tetsuya Nagata, Takahiro Nagayama, Yasushi Nakajima, Hidehiko Nakaya, Andrew J. Pickles, Shuji Sato, Kazuhiro Sekiguchi, Maki Sekiguchi, Koji Sugitani, Tadafumi Takata, Motohide Tamura, Masafumi Yagi, Naoki Yasuda. "Evolution of Elliptical Galaxies at $z \gtrsim 1$ Revealed from a Large, Multicolor Sample of Extremely Red Objects." Nippon Tenmon Gakkai obun kenkyu hokoku 55.6 (2003) 1079-1103