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Questions on pure luminosity evolution for elliptical galaxies
He, P; Zhang, YZ; He, P , Chinese Acad Sci, Beijing Astron Observ, Beijing 100080, Peoples R China.
1999
发表期刊ASTROPHYSICAL JOURNAL
ISSN0004-637X
卷号511期号:2页码:574-584
摘要The explanation for the existence of an excess population of faint blue galaxies (FBGs) has been a mystery for nearly two decades and remains one of the grand astronomical issues to date. Existing models cannot explain all of the observational data, such as galaxy number counts in the optical and infrared passbands and the redshift distributions of galaxies. Here, by modeling the morphological number counts derived from the Hubble Space Telescope, as well as the number counts in optical and infrared passbands and the redshift and color distributions of galaxies obtained from ground-based observations, we show that the "FBG problem" cannot be resolved if elliptical galaxies are assumed to have formed in an instantaneous burst of star formation at high redshift with no subsequent star formation events, which is the conventional scenario for formation and evolution of ellipticals. There exist great discrepancies between the observed B-K color distribution and the predicted distribution for ellipticals by such a pure luminosity evolution (PLE) model in the context of the conventional scenario. Neither can the mild evolution (i.e., the star formation events have lasted for a longer time than those of the instantaneous burst and passive evolution since the formation of galaxies) for ellipticals be accepted in the context of PLE assumption. The introduction of dust extinction also cannot save the PLE models. This conclusion holds for each of the three cosmological models under consideration: flat, open, and A-dominated. Hence, our investigation suggests that PLE assumption for elliptical galaxies is questionable, and number evolution may be essential for ellipticals.
部门归属Chinese Acad Sci, Beijing Astron Observ, Beijing 100080, Peoples R China; CASPKU, Joint Beijing Astrophys Ctr, Beijing 100871, Peoples R China; Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China; CCAST, World Lab, Beijing 100080, Peoples R China
关键词High-redshift Galaxies Faint Blue Galaxies K-band Survey Number Counts Ccd Observations Field Galaxies Merger Model Telescope Population Universe
学科领域Physics
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收录类别SCI
WOS记录号WOS:000079158100006
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/13186
专题理论物理所1978-2010年知识产出
通讯作者He, P , Chinese Acad Sci, Beijing Astron Observ, Beijing 100080, Peoples R China.
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He, P,Zhang, YZ,He, P , Chinese Acad Sci, Beijing Astron Observ, Beijing 100080, Peoples R China.. Questions on pure luminosity evolution for elliptical galaxies[J]. ASTROPHYSICAL JOURNAL,1999,511(2):574-584.
APA He, P,Zhang, YZ,&He, P , Chinese Acad Sci, Beijing Astron Observ, Beijing 100080, Peoples R China..(1999).Questions on pure luminosity evolution for elliptical galaxies.ASTROPHYSICAL JOURNAL,511(2),574-584.
MLA He, P,et al."Questions on pure luminosity evolution for elliptical galaxies".ASTROPHYSICAL JOURNAL 511.2(1999):574-584.
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