The Formation of Compact Elliptical Galaxies in the Vicinity of a Massive Galaxy: The Role of Ram-pressure Confinement

被引:20
作者
Du, Min [1 ]
Debattista, Victor P. [2 ]
Ho, Luis C. [1 ,3 ]
Cote, Patrick [4 ]
Spengler, Chelsea [5 ]
Erwin, Peter [6 ]
Wadsley, James W. [7 ]
Norris, Mark A. [2 ]
Earp, Samuel W. F. [2 ]
Quinn, Thomas R. [8 ]
Fiteni, Karl [9 ,10 ]
Caruana, Joseph [9 ,10 ]
机构
[1] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
[2] Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England
[3] Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
[4] Natl Res Council Canada, Herzberg Inst Astrophys, Victoria, BC V9E 2E7, Canada
[5] Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 5C2, Canada
[6] Max Planck Insitut Extraterrr Phys, Giessenbachstr, D-85748 Garching, Germany
[7] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada
[8] Univ Washington, Astron Dept, Seattle, WA 98195 USA
[9] Univ Malta, Dept Phys, MSD-2080 Msida, Malta
[10] Univ Malta, Inst Space Sci & Astron, MSD-2080 Msida, Malta
基金
中国博士后科学基金; 国家重点研发计划; 美国国家科学基金会;
关键词
galaxies: dwarf; galaxies: evolution; galaxies: formation; galaxies: interactions; galaxies: ISM; DWARF GALAXIES; STAR-FORMATION; STELLAR POPULATIONS; ATLAS(3D) PROJECT; AIMSS PROJECT; MATTER; EVOLUTION; DISCOVERY; CLUSTERS; HALO;
D O I
10.3847/1538-4357/ab0e0c
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Compact ellipticals (cEs) are outliers from the scaling relations of early-type galaxies, particularly the mass-metallicity relation, which is an important outcome of feedback. The formation of such low-mass, but metal-rich and compact, objects is a long-standing puzzle. Using a pair of high-resolution N-body+gas simulations, we investigate the evolution of a gas-rich low-mass galaxy on a highly radial orbit around a massive host galaxy. As the infalling low-mass galaxy passes through the host's corona at supersonic speeds, its diffuse gas outskirts are stripped by ram pressure, as expected. However, the compactness increases rapidly because of bursty star formation in the gas tidally driven to the center. The metal-rich gas produced by supernovae and stellar winds is confined by the ram pressure from the surrounding environment, leading to subsequent generations of stars being more metal-rich. After the gas is depleted, tidal interactions enhance the metallicity further via the stripping of weakly bound, old, and metal-poor stars, while the size of the satellite is changed only modestly. The outcome is a metal-rich cE that is consistent with observations. These results argue that classical cEs are neither the stripped remnants of much more massive galaxies nor the merger remnants of normal dwarfs. We present observable predictions that can be used to test our model.
引用
收藏
页数:10
相关论文
共 74 条
[1]   A new formation model for M32: A threshed early-type spiral galaxy? [J].
Bekki, K ;
Couch, WJ ;
Drinkwater, MJ ;
Gregg, MD .
ASTROPHYSICAL JOURNAL, 2001, 557 (01) :L39-L42
[2]  
Bekki K., 2003, APJ, V596, P13
[3]   The spin and shape of dark matter haloes in the Millennium simulation of a Λ cold dark matter universe [J].
Bett, Philip ;
Eke, Vincent ;
Frenk, Carlos S. ;
Jenkins, Adrian ;
Helly, John ;
Navarro, Julio .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2007, 376 (01) :215-232
[4]   Gas-phase metallicity profiles of the Bluedisk galaxies: Is metallicity in a local star formation regulated equilibrium? [J].
Carton, David ;
Brinchmann, Jarle ;
Wang, Jing ;
Bigiel, Frank ;
Cormier, Diane ;
van der Hulst, Thijs ;
Jozsa, Gyula I. G. ;
Serra, Paolo ;
Verheijen, Marc A. W. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2015, 451 (01) :210-235
[5]   Discovery of a new M 32-like "Compact Elliptical" galaxy in the halo of the Abell 496 cD galaxy [J].
Chilingarian, I. ;
Cayatte, V. ;
Chemin, L. ;
Durret, F. ;
Lagana, T. F. ;
Adami, C. ;
Slezak, E. .
ASTRONOMY & ASTROPHYSICS, 2007, 466 (02) :L21-L24
[6]   Isolated compact elliptical galaxies: Stellar systems that ran away [J].
Chilingarian, Igor ;
Zolotukhin, Ivan .
SCIENCE, 2015, 348 (6233) :418-421
[7]   A Population of Compact Elliptical Galaxies Detected with the Virtual Observatory [J].
Chilingarian, Igor ;
Cayatte, Veronique ;
Revaz, Yves ;
Dodonov, Serguei ;
Durand, Daniel ;
Durret, Florence ;
Micol, Alberto ;
Slezak, Eric .
SCIENCE, 2009, 326 (5958) :1379-1382
[8]   Tidal interaction of M32 and NGC 205 with M31: Surface photometry and numerical simulations [J].
Choi, PI ;
Guhathakurta, P ;
Johnston, KV .
ASTRONOMICAL JOURNAL, 2002, 124 (01) :310-331
[9]   THE LUMINOSITY PROFILE AND STRUCTURAL PARAMETERS OF THE ANDROMEDA GALAXY [J].
Courteau, Stephane ;
Widrow, Lawrence M. ;
McDonald, Michael ;
Guhathakurta, Puragra ;
Gilbert, Karoline M. ;
Zhu, Yucong ;
Beaton, Rachael Lynn ;
Majewski, Steven R. .
ASTROPHYSICAL JOURNAL, 2011, 739 (01)
[10]   Separation of stellar populations by an evolving bar: implications for the bulge of the Milky Way [J].
Debattista, Victor P. ;
Ness, Melissa ;
Gonzalez, Oscar A. ;
Freeman, K. ;
Zoccali, Manuela ;
Minniti, Dante .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2017, 469 (02) :1587-1611