NGC 4104: A shell galaxy in a forming fossil group

被引：3

作者：

Lima Neto, G. B. ^{[1
]}

Durret, F. ^{[2
]}

Lagan, T. F. ^{[3
]}

Machado, R. E. G. ^{[4
]}

Martinet, N. ^{[5
]}

Cuillandre, J-C ^{[6
]}

Adami, C. ^{[5
]}

机构：

[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226, Sao Paulo, Brazil

[2] Sorbonne Univ, CNRS, UMR 7095, Inst Astrophys Paris, 98bis Bd Arago, F-75014 Paris, France

[3] Univ Cidade Sao Paulo, Univ Cruzeiro Sul, Nucleo Astrofis, R Galvao Bueno 868, BR-01506000 Sao Paulo, SP, Brazil

[4] Univ Tecnol Fed Parana, Dept Acad Fis, Rua Sete Setembro 3165, Curitiba, Parana, Brazil

[5] Aix Marseille Univ, LAM, CNES, CNRS, Marseille, France

[6] PSL Res Univ, Univ Paris Saclay, Univ Paris Diderot, IRFU,CEA,Observ Paris,AIM,Sorbonne Paris Cite,CNR, F-91191 Gif Sur Yvette, France

来源：

ASTRONOMY & ASTROPHYSICS | 2020年 / 641卷

基金：

巴西圣保罗研究基金会;

关键词：

galaxies: individual: NGC 4104; galaxies: groups: general; galaxies: photometry; X-rays: galaxies; methods: numerical; BRIGHTEST CLUSTER GALAXIES; X-RAY-EMISSION; ELLIPTIC GALAXIES; SCALING RELATIONS; INFRARED SURVEY; TIDAL STREAMS; EVOLUTION; DYNAMICS; KINEMATICS; DECOMPOSITION;

D O I：

10.1051/0004-6361/201936098

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Groups are the most common association of galaxies in the Universe and they are found in different configuration states, such as loose, compact, and fossil groups.Aims. We studied the galaxy group MKW 4s, dominated by the giant early-type galaxy NGC 4104 at z=0.0282, with the aim of understanding the evolutionary stage of this group and to place it within the framework of the standard Lambda CDM cosmological scenario.Methods. We obtained deep optical data with CFHT/Megacam (g and r bands) and we applied both the GALFIT 2D image fitting program and the IRAF/ELLIPSE 1D radial method to model the brightest group galaxy (BGG) and its extended stellar envelope. We also analysed the publicly available XMM-Newton and Chandra X-ray data. From N-body simulations of dry-mergers with different mass ratios of the infalling galaxy, we were able to constrain the dynamical stage of this system.Results. Our results show a stellar shell system feature in NGC 4104 and an extended envelope that was reproduced by our numerical simulations of a collision with a satellite galaxy taking place about 4-6 Gyr ago. The initial pair of galaxies had a mass ratio of at least 1:3. Taking into account the stellar envelope contribution to the total r band magnitude and the X-ray luminosity, MKW 4s falls into the category of a fossil group.Conclusions. Our results show that we are witnessing a rare case of a shell elliptical galaxy in a forming fossil group.

引用

页数：16

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