The galaxy luminosity function at z ≃ 6 and evidence for rapid evolution in the bright end from z ≃ 7 to 5

被引:151
作者
Bowler, R. A. A. [1 ]
Dunlop, J. S. [1 ]
McLure, R. J. [1 ]
McCracken, H. J. [2 ]
Milvang-Jensen, B. [3 ]
Furusawa, H. [4 ]
Taniguchi, Y. [5 ]
Le Fevre, O. [6 ,7 ]
Fynbo, J. P. U. [3 ]
Jarvis, M. J. [8 ,9 ]
Haeussler, B. [8 ,10 ]
机构
[1] Univ Edinburgh, Royal Observ, Inst Astron, SUPA, Edinburgh EH9 3HJ, Midlothian, Scotland
[2] Univ Paris 06, UMR CNRS 7095, Inst Astrophys Paris, F-75014 Paris, France
[3] Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark
[4] Natl Astron Observ Japan, Astron Data Ctr, Mitaka, Tokyo 1818588, Japan
[5] Ehime Univ, Res Inst Space & Cosm Evolut, Matsuyama, Ehime 7908577, Japan
[6] CNRS, Lab Astrophys Marseille, F-13388 Marseille 13, France
[7] Aix Marseille Univ, F-13388 Marseille 13, France
[8] Univ Oxford, Subdept Astrophys, Oxford OX1 2DL, England
[9] Univ Western Cape, Dept Phys, ZA-7535 Bellville, South Africa
[10] Univ Hertfordshire, Ctr Astrophys, Sci & Technol Res Inst, Hatfield AL10 9AB, Herts, England
基金
欧洲研究理事会;
关键词
galaxies: evolution; galaxies: formation; galaxies: high-redshift; MASS ASSEMBLY GAMA; ULTRA-DEEP FIELD; LYMAN-BREAK GALAXIES; SPACE-TELESCOPE OBSERVATIONS; STAR-FORMATION RATES; PHOTOMETRIC REDSHIFTS; STELLAR POPULATION; PLANCK COSMOLOGY; Z=7 GALAXIES; SKY SURVEY;
D O I
10.1093/mnras/stv1403
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the results of a search for bright (-22.7 <= M-UV <= -20.5) Lyman-break galaxies at z similar or equal to 6 within a total of 1.65 deg(2) of imaging in the UltraVISTA/Cosmological Evolution Survey (COSMOS) and United Kingdom Infrared Telescope Deep Sky Survey (UKIDSS) Ultra Deep Survey (UDS) fields. The deep near-infrared imaging available in the two independent fields, in addition to deep optical (including z'-band) data, enables the sample of z similar or equal to 6 star-forming galaxies to be securely detected longward of the break (in contrast to several previous studies). We show that the expected contamination rate of our initial sample by cool Galactic brown dwarfs is less than or similar to 3 per cent and demonstrate that they can be effectively removed by fitting brown dwarf spectral templates to the photometry. At z similar or equal to 6, the galaxy surface density in the UltraVISTA field exceeds that in the UDS by a factor of similar or equal to 1.8, indicating strong cosmic variance even between degree-scale fields at z > 5. We calculate the bright end of the rest-frame Ultraviolet (UV) luminosity function (LF) at z similar or equal to 6. The galaxy number counts are a factor of similar to 1.7 lower than predicted by the recent LF determination by Bouwens et al. In comparison to other smaller area studies, we find an evolution in the characteristic magnitude between z similar or equal to 5 and z similar or equal to 7 of Delta M* similar to 0.4, and show that a double power law or a Schechter function can equally well describe the LF at z = 6. Furthermore, the bright end of the LF appears to steepen from z similar or equal to 7 to z similar or equal to 5, which could indicate the onset of mass quenching or the rise of dust obscuration, a conclusion supported by comparing the observed LFs to a range of theoretical model predictions.
引用
收藏
页码:1817 / 1840
页数:24
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