PMO OpenIR  > 星系中的恒星形成研究团组
THE PROPERTIES OF H alpha EMISSION-LINE GALAXIES AT z=2.24
An, Fang Xia1; Zheng, Xian Zhong1; Wang, Wei-Hao2; Huang, Jia-Sheng3,4; Kong, Xu5; Wang, Jun-Xian5; Fang, Guan Wen6,7; Zhu, Feifan5; Gu, Qiu-Sheng8; Wu, Hong4; Hao, Lei9; Xia, Xiao-Yang10
2014-04-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume784Issue:2Pages:0
AbstractUsing deep narrowband H(2)S1 and K-s-band imaging data obtained with CFHT/WIRCam, we identify a sample of 56 H alpha emission-line galaxies (ELGs) at z = 2.24 with the 5 sigma depths of H(2)S1 = 22.8 and K-s = 24.8 (AB) over a 383 arcmin(2) area in the Extended Chandra Deep Field South. A detailed analysis is carried out with existing multi-wavelength data in this field. Three of the 56 H alpha ELGs are detected in Chandra 4 Ms X-ray observations and two of them are classified as active galactic nuclei. The rest-frame UV and optical morphologies revealed by HST/ACS and WFC3 deep images show that nearly half of the H alpha ELGs are either merging systems or have a close companion, indicating that the merging/interacting processes play a key role in regulating star formation at cosmic epoch z = 2-3. About 14% are too faint to be resolved in the rest-frame UV morphology due to high dust extinction. We estimate dust extinction from spectral energy distributions. We find that dust extinction is generally correlated with Ha luminosity and stellar mass. Our results suggest that H alpha ELGs are representative of star-forming galaxies. Applying extinction corrections to individual objects, we examine the intrinsic Ha luminosity function (LF) at z = 2.24, obtaining a best-fit Schechter function characterized by a faint-end slope of alpha similar or equal to -1.3. This is shallower than the typical slope of a z-1.6 in previous works based on constant extinction correction. We demonstrate that this difference is mainly due to the different extinction corrections. The proper extinction correction is thus the key to recovering the intrinsic LF as the extinction globally increases with H alpha luminosity. Moreover, we find that our H alpha LF mirrors the stellar mass function of star-forming galaxies at the same cosmic epoch. This finding indeed reflects the tight correlation between star formation rate and stellar mass for star-forming galaxies, i.e., the so-called main sequence.
KeywordGalaxies: Evolution Galaxies: High-redshift Galaxies: Luminosity Function, Mass Function Galaxies: Star Formation
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/784/2/152
WOS KeywordSTAR-FORMING GALAXIES ; HIGH-REDSHIFT GALAXIES ; DEEP FIELD-SOUTH ; SPECTRAL ENERGY-DISTRIBUTIONS ; EXTRAGALACTIC LEGACY SURVEY ; YALE-CHILE MUSYC ; COLD DARK-MATTER ; EQUAL-TO 2.5 ; LUMINOSITY FUNCTION ; DUST EXTINCTION
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000335519400067
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10697
Collection星系中的恒星形成研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan
3.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
5.Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China
6.Dali Univ, Inst Astron & Hist Sci & Technol, Dali 671003, Yunnan, Peoples R China
7.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210093, Jiangsu, Peoples R China
8.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
9.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
10.Tianjin Normal Univ, Tianjin Astrophys Ctr, Tianjin 300387, Peoples R China
Recommended Citation
GB/T 7714
An, Fang Xia,Zheng, Xian Zhong,Wang, Wei-Hao,et al. THE PROPERTIES OF H alpha EMISSION-LINE GALAXIES AT z=2.24[J]. ASTROPHYSICAL JOURNAL,2014,784(2):0.
APA An, Fang Xia.,Zheng, Xian Zhong.,Wang, Wei-Hao.,Huang, Jia-Sheng.,Kong, Xu.,...&Xia, Xiao-Yang.(2014).THE PROPERTIES OF H alpha EMISSION-LINE GALAXIES AT z=2.24.ASTROPHYSICAL JOURNAL,784(2),0.
MLA An, Fang Xia,et al."THE PROPERTIES OF H alpha EMISSION-LINE GALAXIES AT z=2.24".ASTROPHYSICAL JOURNAL 784.2(2014):0.
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