The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS

doi:10.1093/mnras/stz285

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	The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS
	Wang, Peng 1,2; Guo, Quan3 ; Libeskind, Noam I.2,4; Tempel, Elmo 2,5; Wei, Chengliang 1; Kang, Xi 1
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019-04-01
卷号	484 期号:3 页码:4325-4336
关键词	galaxies: dwarf galaxies: general galaxies: haloes Local Group cosmology: observations
ISSN号	0035-8711
DOI	10.1093/mnras/stz285
英文摘要	It has been shown, both in simulations and observationally, that the tidal field of a large galaxy can torque its satellites such that the major axis of satellite galaxies points towards their hosts. This so-called 'shape alignment' has been observed in isolated Milky Way-like galaxies but not in 'Local Group'-like pairs. In this study, we investigate the shape alignment of satellite galaxies in galaxy pairs similar to the Local Group identified in the Sloan Digital Sky Survey Data Release 13 (SDSS DR13). By stacking tens of thousands of satellite galaxies around primary galaxy pairs, we find two statistically strong alignment signals. (1) The major axes of satellite galaxies located in the (projected) area between two primaries (the facing region) tend to be perpendicular to the line connecting the satellite to its host (tangential alignment), while (2) the major axes of satellite galaxies located in regions away from the other host (the away region) tend to be aligned with the line connecting the satellite to its host (radial alignment). These alignments are confirmed at similar to 5 sigma levels. The alignment signal increases with increasing primary brightness, decreasing pair separation, and decreasing satellite distance. The alignment signal is also found to be stronger in filamentary environments. These findings will shed light on understanding the mechanisms of how satellite galaxies are affected by the tidal field in galaxy pairs and will be useful for investigating galaxy intrinsic alignment in the analyses of weak gravitational lensing.
资助项目	NSFC[11333008] ; NSFC[11825303] ; NSFC[11861131006] ; NSFC[11703091] ; NSFC[11743003] ; 973 program[2015CB857003] ; 973 program[2013CB834900] ; University of Lyon under the Investments for the Future Program[ANR-16-IDEX-0005] ; ETAg grants[IUT40-2] ; ETAg grants[IUT26-2] ; EU through the ERDF CoE grants[TK133] ; EU through the ERDF CoE grants[MOBTP86]
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000462410300106
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/31867]
专题	中国科学院上海天文台
通讯作者	Wang, Peng
作者单位	1.PMO, 8 Yuan Hua Rd, Nanjing 2100342, Jiangsu, Peoples R China 2.Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany 3.Shanghai Astron Observ SHAO, Nandan Rd 80, Shanghai 200030, Peoples R China 4.UCB Lyon 1, Univ Lyon, CNRS, IN2P3,IPN Lyon, Lyon, France 5.Univ Tartu, Tartu Observ, Observ 1, EE-61602 Toravere, Estonia
推荐引用方式 GB/T 7714	Wang, Peng,Guo, Quan,Libeskind, Noam I.,et al. The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,484(3):4325-4336.
APA	Wang, Peng,Guo, Quan,Libeskind, Noam I.,Tempel, Elmo,Wei, Chengliang,&Kang, Xi.(2019).The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,484(3),4325-4336.
MLA	Wang, Peng,et al."The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 484.3(2019):4325-4336.