The clustering of hot and cold IRAS galaxies: the redshift-space correlation function期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

按检索

The clustering of hot and cold IRAS galaxies: the redshift-space correlation function

Authors:	E Hawkins S Maddox E Branchini W Saunders

Institution:	;¹School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD;²Dipartimento di Fisica, Universita' degli Studi Roma Tre, Via della Vasca Navale 84, I-00146 Roma, Italy;³Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ;⁴Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia

Abstract:	We measure the autocorrelation function, ξ , of galaxies in the IRAS Point Source Catalogue galaxy redshift (PSC z ) survey and investigate its dependence on the far-infrared colour and absolute luminosity of the galaxies. We find that the PSC z survey correlation function can be modelled out to a scale of 10 h ^?1 Mpc as a power law of slope 1.30±0.04 and correlation length 4.77±0.20 . At a scale of 75 h ^?1 Mpc we find the value of J ₃ to be 1500±400 . We also find that galaxies with higher 100 μm/60 μm flux ratio, corresponding to cooler dust temperatures, are more strongly clustered than warmer galaxies. Splitting the survey into three colour subsamples, we find that, between 1 and 10 h ^?1 Mpc, the ratio of ξ is a factor of 1.5 higher for the cooler galaxies compared with the hotter galaxies. This is consistent with the suggestion that hotter galaxies have higher star formation rates, and correspond to later-type galaxies which are less clustered than earlier types. Using volume-limited subsamples, we find a weak variation of ξ as a function of absolute luminosity, in the sense that more luminous galaxies are less clustered than fainter galaxies. The trend is consistent with the colour dependence of ξ and the observed colour–luminosity correlation, but the large uncertainties mean that it has a low statistical significance.

Keywords:	galaxies: distances and redshifts large-scale structure of Universe infrared: galaxies

设为首页 | 免责声明 | 关于勤云 | 加入收藏