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COULD THE MAGELLANIC CLOUDS BE TIDAL DWARFS EXPELLED FROM A PAST-MERGER EVENT OCCURRING IN ANDROMEDA?
Yang, Y.1,2; Hammer, F.2
2010-12-10
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume725Issue:1Pages:L24-L27
AbstractThe Magellanic Clouds are often considered to be outliers in the satellite system of the Milky Way (MW) because they are irregular and gas-rich galaxies. From their large relative motion, they are likely in their first pass near the MW, possibly originating from another region of the Local Group or its outskirts. M31 could have been in a merger stage in its past and we investigate whether or not the Large Magellanic Cloud (LMC) could have been a tidal dwarf expelled during this event. Such a hypothesis is tested in the frame of present-day measurements and uncertainties of the relative motions of LMC and M31. Our method is to trace back the LMC trajectory using several thousands of different configurations that sample the corresponding parameter space. We find several configurations that place the LMC at 50 kpc from M31, 4.3-8 Gyr ago, depending on the adopted shape of the MW halo. For all configurations, the LMC velocity at such a location is invariably slightly larger than the escape velocity at such a radius. The preferred solutions correspond to a spherical to prolate MW halo, predicting a transverse motion of M31 of less than 107 km s(-1) and down to values that are close to zero. We conclude that from present-day measurements, the Magellanic Clouds could well be tidal dwarfs expelled from a former merger events occurring in M31.
KeywordGalaxies: Dwarf Galaxies: Evolution Galaxies: Interactions Galaxies: Kinematics And Dynamics Local Group Magellanic Clouds
DOI10.1088/2041-8205/725/1/L24
Indexed BySCI
Language英语
WOS IDWOS:000284575400006
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7808
Collection月球与深空探测研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Paris Diderot, CNRS, Observ Paris, GEPI, Meudon, France
Recommended Citation
GB/T 7714
Yang, Y.,Hammer, F.. COULD THE MAGELLANIC CLOUDS BE TIDAL DWARFS EXPELLED FROM A PAST-MERGER EVENT OCCURRING IN ANDROMEDA?[J]. ASTROPHYSICAL JOURNAL LETTERS,2010,725(1):L24-L27.
APA Yang, Y.,&Hammer, F..(2010).COULD THE MAGELLANIC CLOUDS BE TIDAL DWARFS EXPELLED FROM A PAST-MERGER EVENT OCCURRING IN ANDROMEDA?.ASTROPHYSICAL JOURNAL LETTERS,725(1),L24-L27.
MLA Yang, Y.,et al."COULD THE MAGELLANIC CLOUDS BE TIDAL DWARFS EXPELLED FROM A PAST-MERGER EVENT OCCURRING IN ANDROMEDA?".ASTROPHYSICAL JOURNAL LETTERS 725.1(2010):L24-L27.
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