z ∼ 7-10 galaxies in the HUDF and GOODS fields:: UV luminosity functions

被引:246
作者
Bouwens, Rychard J. [1 ]
Illingworth, Garth D. [1 ]
Franx, Marijn [2 ]
Ford, Holland [3 ]
机构
[1] Univ Calif Santa Cruz, Dept Astron, Santa Cruz, CA 95064 USA
[2] Leiden Observ, NL-2300 RA Leiden, Netherlands
[3] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
关键词
galaxies : evolution; galaxies : high-redshift;
D O I
10.1086/590103
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We use all available deep optical ACS and near-IR data over both the HUDF and the two GOODS fields to search for star-forming galaxies at z greater than or similar to 7 and constrain the UV LF within the first 700 Myr. Our data set includes similar to 23 arcmin(2) of deep NICMOS J + H data and similar to 248 arcmin(2) of ground-based (ISAAC+MOIRCS) data, coincident with ACS optical data of greater or equal depths. In total, we find eighth < z > similar to 7.3 z-dropouts in our search fields, but no z similar to 9 J-dropout candidates. A careful consideration of a wide variety of different contaminants suggest an overall contamination level of just similar to 12% for our z-dropout selection. After performing detailed simulations to accurately estimate the selection volumes, we derive constraints on the UV LFs at z similar to 7 and z similar to 9. For a faint-end slope alpha - -1.74, our most likely values for M-UV* and phi* at z similar to 7 are -19.8 +/- 0.4 mag and 1.1(-0.7)(+1.7) x 10(-3) Mpc(-3), respectively. Our search results for z similar to 9 J-dropouts set a 1 sigma lower limit on M-UV* of -19.6 mag assuming that phi* and alpha are the same as their values at slightly later times. This lower limit on M-UV* is 1.4 mag fainter than our best-fit value at z similar to 4, suggesting that the UV LF has undergone substantial evolution over this time period. No evolution is ruled out at 99% confidence from z similar to 7 to z similar to 6 and at 80% confidence from z similar to 9 to z similar to 7. We find that the mass-to-light ratio of halos evolves as similar to(1+ z)(-1) if we require that the observed brightening in M-UV* with redshift [i.e., M-UV* (-21.02 +/- 0.09) + (0.36 +/- 0.08)(z - 3.8)] be consistent with the expected evolution in the halo mass function. Finally, we consider the shape of the UV LF at z greater than or similar to 5 and discuss the implications of the Schechter-like form of the observed LFs, particularly the unexpected abrupt cutoff at the bright end.
引用
收藏
页码:230 / 250
页数:21
相关论文
共 118 条
[31]   Where are z=4 Lyman Break Galaxies?: Results from conditional luminosity function models of luminosity-dependent clustering [J].
Cooray, Asantha ;
Ouchi, Masami .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2006, 369 (04) :1869-1879
[32]   The many lives of active galactic nuclei: cooling flows, black holes and the luminosities and colours of galaxies [J].
Croton, DJ ;
Springel, V ;
White, SDM ;
De Lucia, G ;
Frenk, CS ;
Gao, L ;
Jenkins, A ;
Kauffmann, G ;
Navarro, JF ;
Yoshida, N .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2006, 365 (01) :11-28
[33]  
DEJONG RS, 2006, HST CALIBRATION WORK, P121
[34]   Galaxy bimodality due to cold flows and shock heating [J].
Dekel, A ;
Birnboim, Y .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2006, 368 (01) :2-20
[35]  
Dickinson M, 1999, AIP CONF PROC, V470, P122
[36]   Color-selected galaxies at z≈6 in the Great Observatories Origins Deep Survey [J].
Dickinson, M ;
Stern, D ;
Giavalisco, M ;
Ferguson, HC ;
Tsvetanov, Z ;
Chornock, R ;
Cristiani, S ;
Dawson, S ;
Dey, A ;
Filippenko, AV ;
Moustakas, LA ;
Nonino, M ;
Papovich, C ;
Ravindranath, S ;
Riess, A ;
Rosati, P ;
Spinrad, H ;
Vanzella, E .
ASTROPHYSICAL JOURNAL, 2004, 600 (02) :L99-L102
[37]  
Dickinson M., 2004, BAAS, V36, P701
[38]  
Dickinson M, 1998, HUBBLE DEEP FIELD, P219
[39]  
DUNKLEY J, 2008, APJS UNPUB
[40]   ANALYSIS OF A COMPLETE GALAXY REDSHIFT SURVEY .2. THE FIELD-GALAXY LUMINOSITY FUNCTION [J].
EFSTATHIOU, G ;
ELLIS, RS ;
PETERSON, BA .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1988, 232 (02) :431-461