An early-type galaxy with an inner star-forming disc

被引：4
作者：
Li, Song-lin [1 ,2 ]
Shi, Yong [1 ,2 ]
Chen, Yan-Mei [1 ,2 ]
Tabor, Matha [3 ]
Bizyaev, Dmitry [4 ,5 ,6 ,7 ]
Chen, Jian-hang [1 ,2 ]
Yu, Xiao-ling [1 ,2 ]
Bing, Long-ji [1 ,2 ]
机构：
[1] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
[3] Univ Nottingham, Sch Phys & Astron, Univ Pk, Nottingham NG7 2RD, England
[4] Apache Point Observ, POB 59, Sunspot, NM 88349 USA
[5] New Mexico State Univ, POB 59, Sunspot, NM 88349 USA
[6] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119234, Russia
[7] Russian AS, Special Astrophys Observ, Nizhnii Arkhyz 369167, Russia
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 480卷 / 02期
基金：
国家重点研发计划; 美国安德鲁·梅隆基金会; 俄罗斯科学基金会; 中国国家自然科学基金;
关键词：
galaxies: elliptical and lenticular; CD; galaxies: individual: SDSS J142055.01+400715.7; galaxies: star formation; INTEGRAL-FIELD SPECTROSCOPY; DIGITAL SKY SURVEY; ATLAS(3D) PROJECT; SAURON PROJECT; ELLIPTIC GALAXIES; NEARBY GALAXIES; S0; GALAXIES; CLASSIFICATION; PHOTOMETRY; COMPONENTS;
D O I：
10.1093/mnras/sty2008
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Early-type galaxies (ETGs) are composed of two distinct populations: high-mass and low-mass, which are likely to be built via gas-poor merging and gas-rich merging/accretion, respectively. However, it is difficult to directly associate low-mass ETGs with gas-rich processes because currently they are gas poor with no signs of ongoing star formation. We report a discovery of an ETG (SDSS J142055.01+400715.7) with M-* = 10(10) M-circle dot that offers direct evidence for gas-rich merging as the origin of low-mass ETGs. The integrated properties of the galaxy are consistent with a typical low-mass ETG, but the outer and inner regions show distinct dispersion- and rotation-dominated kinematics, respectively. There are some tidal features surrounding the galaxy. These two facts suggest very recent galaxy merging. Furthermore, the inner disc harbors ongoing star formation, indicating the merging to be gas rich. This type of galaxy is rare, but it may be a demonstration of the role the transient phase of gas-rich merging plays in making a low-mass ETG.
引用
收藏
页码：1705 / 1710
页数：6
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