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Dark matter and H I in ultra-diffuse galaxy UGC 2162
Sengupta, Chandreyee1; Scott, T. C.2; Chung, Aeree3; Wong, O. Ivy4
2019-09-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume488Issue:3Pages:3222-3230
Corresponding AuthorSengupta, Chandreyee(sengupta.chandreyee@gmail.com) ; Scott, T. C.(tom.scott@astro.up.pt)
AbstractOur GMRT (Giant Metrewave Radio Telescope) HI observations of the ultra-diffuse galaxy (UDG) UGC?2162, projected similar to 300 kpc from the centre of the M?77 group, reveal it to a have an extended HI disc (R-HI/R25| similar to 3.3) with a moderate rotational velocity (V-rot similar to 31 km s(-1)). This V(rot)is in line with that of dwarf galaxies with similar HI mass. We estimate an M-dyn of similar to 1.14 x 10(9) M-circle dot within the galaxy's R-HI similar to 5.2 kpc. Additionally, our estimates of M-200 for the galaxy from NFW models are in the range of 5.0-8.8 x 10(10) M-circle dot. Comparing UGC 2162 to samples of UDGs with HI detections show it to have amongst the smallest R-e with its M-HI/M-* being distinctly higher and g-i colour slightly bluer than typical values in those samples. We also compared HI and dark matter (DM) halo properties of UGC 2162 with dwarf galaxies in the LITTLE THINGS sample and find its DM halo mass and profile are within the range expected for a dwarf galaxy. While we were unable to determine the origin of the galaxys present-day optical form from our study, its normal HI rotation velocity in relation to its HI mass, HI morphology, environment, and dwarf mass DM halo ruled out some of the proposed ultra-diffuse galaxy formation scenarios for this galaxy.
Keywordgalaxies: individual: UGC 2.162 galaxies: kinematics and dynamics galaxies: ISM galaxies: haloes radio lines: galaxies.
DOI10.1093/mnras/stz1884
WOS KeywordULTRADIFFUSE GALAXIES ; IRREGULAR GALAXIES ; POPULATION ; LUMINOSITY ; CLUSTERS ; DENSITY ; STELLAR ; CLUES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000485158400018
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27820
Collection中国科学院紫金山天文台
Corresponding AuthorSengupta, Chandreyee; Scott, T. C.
Affiliation1.Purple Mt Observ, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
2.Inst Astrophys & Space Sci IA, Rua Estrelas, P-4150762 Porto, Portugal
3.Yonsei Univ, Dept Astron, 50 Yonsei Ro, Seoul 03722, South Korea
4.Univ Western Australia, ICRAR, 35 Stirling Highway, Perth, WA 6009, Australia
Recommended Citation
GB/T 7714
Sengupta, Chandreyee,Scott, T. C.,Chung, Aeree,et al. Dark matter and H I in ultra-diffuse galaxy UGC 2162[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,488(3):3222-3230.
APA Sengupta, Chandreyee,Scott, T. C.,Chung, Aeree,&Wong, O. Ivy.(2019).Dark matter and H I in ultra-diffuse galaxy UGC 2162.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,488(3),3222-3230.
MLA Sengupta, Chandreyee,et al."Dark matter and H I in ultra-diffuse galaxy UGC 2162".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 488.3(2019):3222-3230.
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