A lack of evolution in the very bright end of the galaxy luminosity function from z ≃ 8 to 10

被引：179

作者：

Bowler, R. A. A. ^{[1
]}

Jarvis, M. J. ^{[1
,2
]}

Dunlop, J. S. ^{[3
]}

McLure, R. J. ^{[3
]}

McLeod, D. J. ^{[3
]}

Adams, N. J. ^{[1
]}

Milvang-Jensen, B. ^{[4
,5
]}

McCracken, H. J. ^{[6
]}

机构：

[1] Univ Oxford, Dept Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England

[2] Univ Western Cape, Dept Phys, ZA-7535 Bellville, South Africa

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

[4] Cosm Dawn Ctr DAWN, Copenhagen, Denmark

[5] Univ Copenhagen, Niels Bohr Inst, Lyngbyvej 2, DK-2100 Copenhagen, Denmark

[6] Sorbonne Univ, Inst Astrophys Paris, CNRS, UMR 7095, 98 Bis Blvd Arago, F-75014 Paris, France

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2020年 / 493卷 / 02期

基金：

英国科学技术设施理事会; 日本学术振兴会; 新加坡国家研究基金会;

关键词：

galaxies: evolution; galaxies: formation; galaxies: high-redshift; MASS ASSEMBLY GAMA; PHOTOMETRIC REDSHIFTS; DUST ATTENUATION; L-DWARF; POPULATION; PROJECT; COLORS; COSMOS; ONSET;

D O I：

10.1093/mnras/staa313

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We utilize deep near-infrared survey data from the UltraVISTA fourth data release (DR4) and the VIDEO survey, in combination with overlapping optical and Spitzer data, to search for bright star-forming galaxies at z greater than or similar to 7.5. Using a full photometric redshift fitting analysis applied to the similar to 6 deg(2) of imaging searched, we find 27 Lyman break galaxies (LBGs), including 20 new sources, with best-fitting photometric redshifts in the range 7.4 < z < 9.1. From this sample, we derive the rest-frame UV luminosity function at z = 8 and z = 9 out to extremely bright UV magnitudes (M-UV similar or equal to -23) for the first time. We find an excess in the number density of bright galaxies in comparison to the typically assumed Schechter functional form derived from fainter samples. Combined with previous studies at lower redshift, our results show that there is little evolution in the number density of very bright (M-UV similar to -23) LBG5 between z similar or equal to 5 and z similar or equal to 9. The tentative detection of an LBG with best-fitting photometric redshift of z = 10.9 +/- 1.0 in our data is consistent with the derived evolution. We show that a double power-law fit with a brightening characteristic magnitude (Delta M*/Delta z similar or equal to -0.5) and a steadily steepening bright-end slope (Delta beta/Delta z similar or equal to -0.5) provides a good description of the z > 5 data over a wide range in absolute UV magnitude (-23 < M-UV < -17). We postulate that the observed evolution can be explained by a lack of mass quenching at very high redshifts in combination with increasing dust obscuration within the first similar to 1 Gyr of galaxy evolution.

引用

页码：2059 / 2084

页数：26

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