Star-Forming Galaxies at z - 2 in the Hubble Ultra Deep Field |
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作者姓名: | Xu Kong Wei Zhang Min Wang |
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作者单位: | [1]Center for Astrophysics, University of Science and Technology of China, Hefei 230026 [2]Joint Institute for Galaxy and Cosmology (JOINGC) of SHAO and USTC, University of Science and Technology of China, Hefei 230026 [3]National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012 |
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摘 要: | Using a simple color selection based on B-, z- and K-band photometry, BzK =(z - K)AB - (B - Z)AB 〉 -0.2, we picked out 52 star-forming galaxies at 1.4 ≤z ≤ 2.5 (sBzKs) from a K-band selected sample (Kvega 〈 22.0) in an area of - 5.5 arcmin^2 of the Hubble Ultra Deep Field (UDF). We develop a new photometric redshift method, and the error in our photometric redshifts is less than 0.02(1 + z). From the photometric redshift distribution, we find the BzK color criterion can be used to select star-forming galaxies at 1.4≤ z ≤ 2.5 with Kvega 〈 22.0. Down to Kvega 〈 22.0, the number counts of sBzKs increase linearly with the K magnitude; the sBzKs are strongly clustered, and most of them have irregular morphologies on the ACS images. They have a median reddening of E(B - V) - 0.28, an average star formation rate of - 36 M⊙ yr^-1 and a typical stellar mass of - 10^10 M⊙. The UV criterion for the galaxies at z - 2 can select most of the faint sBzKs in the UDF, but it does not work well for bright, massive, highly-reddened, actively star-forming galaxies.
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关 键 词: | 星系 进化星系 强红移星系 测光法 宇宙学 |
收稿时间: | 2007-04-12 |
修稿时间: | 2007-05-16 |
Star-Forming Galaxies at z - 2 in the Hubble Ultra Deep Field |
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Abstract: | |
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Keywords: | galaxies evolution -galaxies high-redshift - galaxies photometry - cosmology observations |
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