The origin of low-surface-brightness galaxies in the dwarf regime

被引：43

作者：

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

Martin, G. ^{[2
,3
]}

Kaviraj, S. ^{[1
]}

Ramsoy, M. ^{[4
]}

Devriendt, J. E. G. ^{[4
]}

Sedgwick, T. ^{[5
]}

Laigle, C. ^{[6
,7
]}

Choi, H. ^{[8
,9
]}

Beckmann, R. S. ^{[6
,7
]}

Volonteri, M. ^{[6
,7
]}

Dubois, Y. ^{[6
,7
]}

Pichon, C. ^{[6
,7
,10
]}

Yi, S. K. ^{[8
,9
]}

Slyz, A. ^{[4
]}

Kraljic, K. ^{[11
]}

Kimm, T. ^{[8
,9
]}

Peirani, S. ^{[12
]}

Baldry, I ^{[5
]}

机构：

[1] Univ Hertfordshire, Sch Phys Astron & Math, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England

[2] Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85719 USA

[3] Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea

[4] Univ Oxford, Dept Phys, Keble Rd, Oxford OX1 3RH, England

[5] Liverpool John Moores Univ, Astrophys Res Inst, IC2,Liverpool Sci Pk,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England

[6] UMPC Univ Paris 06, Sorbonne Univ, Inst Astrophys Paris, 98 Bis Bd Arago, F-75014 Paris, France

[7] CNRS, UMP 7095, 98 Bis Bd Arago, F-75014 Paris, France

[8] Yonsei Univ, Dept Astron, Seoul 03722, South Korea

[9] Yonsei Univ, Yonsei Univ Observ, Seoul 03722, South Korea

[10] Korea Inst Adv Study KIAS, Sch Phys, 85 Hoegiro, Seoul 02455, South Korea

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

[12] Univ Cote Azur, Observ Cote Azur, Lab Lagrange, CNRS, Bd Observ,CS 34229, F-34229 Nice 4, France

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2021年 / 502卷 / 03期

基金：

新加坡国家研究基金会; 英国科学技术设施理事会;

关键词：

methods: numerical; galaxies: evolution; galaxies: formation; galaxies: interactions; ULTRA-DIFFUSE GALAXIES; PERSISTENT COSMIC WEB; FILAMENTARY STRUCTURE; RADIATIVE-TRANSFER; SKY SURVEY; DENSITY; SUBSTRUCTURE; LUMINOSITY; EVOLUTION; CLUSTERS;

D O I：

10.1093/mnras/stab077

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Low-surface-brightness galaxies (LSBGs) - defined as systems that are fainter than the surface-brightness limits of past wide-area surveys - form the overwhelming majority of galaxies in the dwarf regime (M-star < 10(9) M-circle dot). Using NewHorizon, a high-resolution cosmological simulation, we study the origin of LSBGs and explain why LSBGs at similar stellar mass show the large observed spread in surface brightness. NewHorizon galaxies populate a well-defined locus in the surface brightness-stellar mass plane, with a spread of similar to 3 mag arcsec(-2), in agreement with deep Sloan Digital Sky Survey (SDSS) Stripe 82 data. Galaxies with fainter surface brightnesses today are born in regions of higher dark matter density. This results in faster gas accretion and more intense star formation at early epochs. The stronger resultant supernova feedback flattens gas profiles at a faster rate, which, in turn, creates shallower stellar profiles (i.e. more diffuse systems) more rapidly. As star formation declines towards late epochs (z < 1), the larger tidal perturbations and ram pressure experienced by these systems (due to their denser local environments) accelerate the divergence in surface brightness, by increasing their effective radii and reducing star formation, respectively. A small minority of dwarfs depart from the main locus towards high surface brightnesses, making them detectable in past wide surveys (e.g. standard-depth SDSS images). These systems have anomalously high star formation rates, triggered by recent fly-by or merger-driven starbursts. We note that objects considered extreme or anomalous at the depth of current data sets, e.g. 'ultra-diffuse galaxies', actually dominate the predicted dwarf population and will be routinely visible in future surveys like the Legacy Survey of Space and Time (LSST).

引用

页码：4262 / 4276

页数：15

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