THE PROPERTIES OF H alpha EMISSION-LINE GALAXIES AT z=2.24
文献类型：期刊论文
| 作者 | 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 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2014-04-01 |
| 卷号 | 784期号:2页码:0 |
| ISSN号 | 0004-637X |
| 关键词 | galaxies: evolution galaxies: high-redshift galaxies: luminosity function, mass function galaxies: star formation |
| 英文摘要 | Using 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | STAR-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 |
| 收录类别 | SCI |
| 原文出处 | 10.1088/0004-637X/784/2/152 |
| 语种 | 英语 |
| WOS记录号 | WOS:000335519400067 |
| 公开日期 | 2014-11-21 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/10697]  |
| 专题 | 紫金山天文台_星系中的恒星形成研究团组 |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：紫金山天文台
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