The Blue Compact Dwarf Galaxy VCC 848 Formed by Dwarf-Dwarf Merging: Hi Gas, Star Formation, and Numerical Simulations
Zhang, Hong-Xin11,12; Smith, Rory14; Oh, Se-Heon13; Paudel, Sanjaya15; Duc, Pierre-Alain1; Boselli, Alessandro2; Cote, Patrick3; Ferrarese, Laura3; Gao, Yu4,5; Hunter, Deidre A.6
刊名ASTROPHYSICAL JOURNAL
2020-09-01
卷号900期号:2页码:20
关键词Blue compact dwarf galaxies Disk galaxies Dwarf galaxies Dwarf irregular galaxies Irregular galaxies Galaxy interactions Galaxy mergers Interstellar medium Hydrodynamical simulations H I line emission
ISSN号0004-637X
DOI10.3847/1538-4357/abab96
产权排序第15完成单位
文献子类Article
英文摘要

A clear link between a dwarf-dwarf merger event and enhanced star formation (SF) in the recent past was recently identified in the gas-dominated merger remnant VCC 848, offering by far the clearest view of a gas-rich late-stage dwarf-dwarf merger. We present a joint analysis of JVLA Hi emission line mapping, optical imaging, and numerical simulations of VCC 848 in order to examine the effect of the merger on the stellar and gaseous distributions. VCC 848 has less than 30% of its Hi gas concentrated within the central high-surface-brightness star-forming region, while the remaining Hi is entrained in outlying tidal features. Particularly, a well-defined tidal arm reachesN(Hi) comparable to the galaxy center but lacks SF. The molecular gas mass inferred from the current SF rate (SFR) dominates over the atomic gas mass in the central similar to 1.5 kpc. VCC 848 is consistent with being a main-sequence star-forming galaxy for itscurrentstellar mass and SFR. The Hii region luminosity distribution largely agrees with that of normal dwarf irregulars with similar luminosities, except that the brightest Hii region is extraordinarily luminous. OurN-body/hydrodynamical simulations imply that VCC 848 is a merger between a gas-dominated primary progenitor and a gas-bearing star-dominated secondary. The progenitors had their first passage on a near-radial noncoplanar orbit more than 1 Gyr ago. The merger did not build up a core as compact as typical compact dwarfs with a centralized starburst, which may be partly ascribed to the star-dominated nature of the secondary and, in a general sense, a negative stellar feedback following intense starbursts triggered at early stages of the merger.

学科主题天文学 ; 星系与宇宙学
URL标识查看原文
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
资助项目National Key R&D Program of China[2017YFA0402702] ; NSFC[11973039] ; NSFC[11421303] ; CAS Pioneer Hundred Talents Program ; New Researcher Program (Shinjin grant) through the National Research Foundation of Korea[2019R1C1C1009600] ; National Research Foundation of Korea (NRF) grant - Korea government (Ministry of Science and ICT: MSIT)[NRF-2020R1A2C1008706] ; National Key Basic Research and Development Program of China[2017YFA0402700] ; National Natural Science Foundation of China[11861131007] ; National Natural Science Foundation of China[11420101002] ; Chinese Academy of Sciences Key Research Program of Frontier Sciences[QYZDJSSW-SLH008]
WOS关键词H-II REGIONS ; DIGITAL SKY SURVEY ; VIRGO CLUSTER ; NEARBY GALAXIES ; MAJOR MERGERS ; RAM-PRESSURE ; DARK-MATTER ; STARBURST GALAXIES ; HII-REGIONS ; MASS-LOSS
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000570681000001
资助机构National Key R&D Program of China[2017YFA0402702] ; NSFC[11973039, 11421303] ; CAS Pioneer Hundred Talents Program ; New Researcher Program (Shinjin grant) through the National Research Foundation of Korea[2019R1C1C1009600] ; National Research Foundation of Korea (NRF) grant - Korea government (Ministry of Science and ICT: MSIT)[NRF-2020R1A2C1008706] ; National Key Basic Research and Development Program of China[2017YFA0402700] ; National Natural Science Foundation of China[11861131007, 11420101002] ; Chinese Academy of Sciences Key Research Program of Frontier Sciences[QYZDJSSW-SLH008]
内容类型期刊论文
源URL[http://ir.ynao.ac.cn/handle/114a53/23781]  
专题云南天文台_丽江天文观测站(南方基地)
通讯作者Zhang, Hong-Xin
作者单位1.Université de Strasbourg, CNRS, Observatoire Astronomique de Strasbourg, UMR 7550, F-67000 Strasbourg, France
2.Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, F-13388 Marseille, France
3.National Research Council of Canada, Herzberg Astronomy and Astrophysics Program, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada
4.Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
5.Purple Mountain Observatory, Chinese Academy of Sciences, 10 Yuanhua Road, Nanjing 210023, People's Republic of China
6.Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA
7.Instituto de Astrofísica, Pontificia Universidad Católica de Chile, 7820436 Macul, Santiago, Chile
8.Department of Astronomy, Peking University, Beijing 100871, People's Republic of China
9.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People's Republic of China
10.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
推荐引用方式
GB/T 7714
Zhang, Hong-Xin,Smith, Rory,Oh, Se-Heon,et al. The Blue Compact Dwarf Galaxy VCC 848 Formed by Dwarf-Dwarf Merging: Hi Gas, Star Formation, and Numerical Simulations[J]. ASTROPHYSICAL JOURNAL,2020,900(2):20.
APA Zhang, Hong-Xin.,Smith, Rory.,Oh, Se-Heon.,Paudel, Sanjaya.,Duc, Pierre-Alain.,...&Zhao YH.(2020).The Blue Compact Dwarf Galaxy VCC 848 Formed by Dwarf-Dwarf Merging: Hi Gas, Star Formation, and Numerical Simulations.ASTROPHYSICAL JOURNAL,900(2),20.
MLA Zhang, Hong-Xin,et al."The Blue Compact Dwarf Galaxy VCC 848 Formed by Dwarf-Dwarf Merging: Hi Gas, Star Formation, and Numerical Simulations".ASTROPHYSICAL JOURNAL 900.2(2020):20.
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