A ROBUST MEASURE OF DARK MATTER HALO ELLIPTICITIES

doi:10.3847/2041-8205/826/2/L23

	A ROBUST MEASURE OF DARK MATTER HALO ELLIPTICITIES
	Evslin, Jarah
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2016-08-01
卷号	826 页码:5
关键词	astrometry Local Group
ISSN号	2041-8205
DOI	10.3847/2041-8205/826/2/L23
英文摘要	In simulations of the standard cosmological model (Lambda CDM), dark matter halos are aspherical. However, so far the asphericity of an individual galaxy's halo has never been robustly established. We use the Jeans equations to define a quantity that robustly characterizes a deviation from rotational symmetry. This quantity is essentially the gravitational torque and it roughly provides the ellipticity projected along the line of sight. We show that the Thirty Meter Telescope (TMT), with a single epoch of observations combined with those of the Gaia Space Telescope, can distinguish the Lambda CDM value of the torque from zero for each Sculptor-like dwarf galaxy with a confidence between 0 and 5 sigma, depending on the orientation of each halo. With two epochs of observations, TMT will achieve a 5 sigma discovery of torque and thus asphericity for most such galaxies, thus providing a new and powerful test of the Lambda CDM model.
资助项目	NSFC MianShang[11375201]
WOS关键词	AQUARIUS SIMULATIONS ; DWARF GALAXIES ; TELESCOPE ; SCULPTOR ; FORNAX ; SHAPE
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000381334800007
资助机构	NSFC MianShang
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/43150]
专题	中国科学院近代物理研究所
通讯作者	Evslin, Jarah
作者单位	Chinese Acad Sci, Inst Modern Phys, NanChangLu 509, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Evslin, Jarah. A ROBUST MEASURE OF DARK MATTER HALO ELLIPTICITIES[J]. ASTROPHYSICAL JOURNAL LETTERS,2016,826:5.
APA	Evslin, Jarah.(2016).A ROBUST MEASURE OF DARK MATTER HALO ELLIPTICITIES.ASTROPHYSICAL JOURNAL LETTERS,826,5.
MLA	Evslin, Jarah."A ROBUST MEASURE OF DARK MATTER HALO ELLIPTICITIES".ASTROPHYSICAL JOURNAL LETTERS 826(2016):5.