The clustering and abundance of star-forming and passive galaxies at z ∼ 2

被引：42

作者：

Hartley, W. G. ^{[1
]}

Lane, K. P. ^{[1
]}

Almaini, O. ^{[1
]}

Cirasuolo, M. ^{[2
]}

Foucaud, S. ^{[1
]}

Simpson, C. ^{[3
]}

Maddox, S. ^{[1
]}

Smail, I. ^{[4
]}

Conselice, C. J. ^{[1
]}

McLure, R. J. ^{[2
]}

Dunlop, J. S. ^{[5
]}

机构：

[1] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

[2] Univ Edinburgh, Royal Observ, Inst Astron, SUPA, Edinburgh EH9 3HJ, Midlothian, Scotland

[3] Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England

[4] Univ Durham, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England

[5] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2008年 / 391卷 / 03期

基金：

英国科学技术设施理事会;

关键词：

galaxies: evolution; galaxies: formation; galaxies: high-redshift; large-scale structure of Universe; infrared: galaxies;

D O I：

10.1111/j.1365-2966.2008.13956.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use the UKIRT (United Kingdom Infrared Telescope) Infrared Deep Sky Survey (UKIDSS) Ultra-deep survey (UDS), currently the deepest panoramic near-infrared survey, together with deep Subaru optical imaging to measure the clustering, number counts and luminosity function of galaxies at z similar to 2 selected using the BzK selection technique. We find that both star-forming (sBzK) and passive (pBzK) galaxies, to a magnitude limit of K-AB < 23, are strongly clustered. The passive galaxies are the most strongly clustered population, with scalelengths of r(0) = 15.0(-2.2)(+1.9) h(-1) Mpc compared with r(0) = 6.75(-0.37)(+0.34) h(-1) Mpc for star-forming galaxies. The direct implication is that passive galaxies inhabit the most massive dark matter haloes, and are thus identified as the progenitors of the most massive galaxies at the present day. In addition, the pBzKs exhibit a sharp flattening and potential turnover in their number counts, in agreement with other recent studies. This plateau cannot be explained by the effects of incompleteness. We conclude that only very massive galaxies are undergoing passive evolution at this early epoch, consistent with the downsizing scenario for galaxy evolution. Assuming a purely passive evolution for the pBzKs from their median redshift to the present day, their luminosity function suggests that only similar to 2.5 per cent of present-day massive ellipticals had a pBzK as a main progenitor.

引用

页码：1301 / 1307

页数：7

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