Galaxies with monstrous black holes in galaxy cluster environments

被引：17
作者：
van Son, Lieke A. C. [1 ]
Barber, Christopher [1 ]
Bahe, Yannick M. [1 ]
Schaye, Joop [1 ]
Barnes, David J. [2 ,3 ]
Crain, Robert A. [4 ]
Kay, Scott T. [3 ]
Theuns, Tom [5 ]
Dalla Vecchia, Claudio [6 ,7 ]
机构：
[1] Leiden Univ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands
[2] MIT, Dept Phys, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
[3] Univ Manchester, Jodrell Bank Ctr Astrophys, Sch Phys & Astron, Manchester M13 9PL, Lancs, England
[4] Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
[5] Univ Durham, Dept Phys, Inst Computat Cosmol, South Rd, Durham DH1 3LE, England
[6] Inst Astrofis Canarias, C Via Lactea S-N, E-38205 Tenerife, Spain
[7] Univ La Laguna, Dept Astrofis, Ave Astrofis Franciso Sanchez S-N, E-38206 Tenerife, Spain
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 485卷 / 01期
关键词：
galaxies: evolution; galaxies: formation; galaxies: interactions; STAR-FORMATION; EAGLE SIMULATIONS; COMPACT; EVOLUTION; MASS; PROJECT; GROWTH; RATES;
D O I：
10.1093/mnras/stz399
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Massive early-type galaxies follow a tight relation between the mass of their central supermassive black hole (M-BH) and their stellar mass (M-star). The origin of observed positive outliers from this relation with extremely high M-BH (> 10(9) M-circle dot) remains unclear. We present a study of such outliers in the Hydrangea/C-EAGLE cosmological hydrodynamical simulations, designed to enable the study of high-mass galaxy formation and evolution in cluster environments. We find 69 M-BH(M-star) outliers at z = 0, defined as those with M-BH > 10(7) M-circle dot and M-BH/M-star > 0.01. This paper focuses on a sample of five extreme outliers, that have been selected based on their M-BH and M-star values, which are comparable to the most recent estimates of observed positive outliers. This sample of five outliers, classified as 'black hole monster galaxies' (BMGs), was traced back in time to study their origin and evolution. In agreement with the results of previous simulations for lower mass MBH(M star) outliers, we find that these galaxies became outliers due to a combination of their early formation times and tidal stripping. For BMGs with M-BH > 10(9) M-circle dot, major mergers (with a stellar mass ratio of mu > 0.25) at early times (z > 2) precede the rapid growth of their supermassive BHs. Furthermore, the scatter in the relation between M-BH and stellar velocity dispersion, sigma, correlates positively with the scatter in [Mg/Fe](sigma). This indicates that the alpha enhancement of these galaxies, which is closely related to their star formation history, is related to the growth of their central BHs.
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收藏
页码：396 / 407
页数：12
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