| |  Online-Ressource |
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| Verfasst von: | Collins, Michelle [VerfasserIn]  |
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| | Chapman, Scott C. [VerfasserIn] |
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| | Rich, R. Michael [VerfasserIn] |
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| | Ibata, Rodrigo A. [VerfasserIn] |
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| | Martin, Nicolas F. [VerfasserIn] |
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| | Irwin, Michael J. [VerfasserIn] |
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| | Bate, Nicholas F. [VerfasserIn] |
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| | Lewis, Geraint F. [VerfasserIn] |
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| | Peñarrubia, Jorge [VerfasserIn] |
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| | Arimoto, Nobuo [VerfasserIn] |
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| | Casey, Caitlin M. [VerfasserIn] |
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| | Ferguson, Annette M. N. [VerfasserIn] |
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| | Koch-Hansen, Andreas [VerfasserIn] |
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| | McConnachie, Alan W. [VerfasserIn] |
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| | Tanvir, Nial [VerfasserIn] |
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| Titel: | A kinematic study of the Andromeda dwarf spheroidal system |
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| Verf.angabe: | Michelle L. M. Collins, Scott C. Chapman, R. Michael Rich, Rodrigo A. Ibata, Nicolas F. Martin, Michael J. Irwin, Nicholas F. Bate, Geraint F. Lewis, Jorge Peñarrubia, Nobuo Arimoto, Caitlin M. Casey, Annette M.N. Ferguson, Andreas Koch, Alan W. McConnachie, Nial Tanvir |
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| E-Jahr: | 2013 |
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| Jahr: | 26 Feb 2013 |
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| Umfang: | 41 S. |
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| Teil: | volume:768 |
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| | year:2013 |
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| | number:2 |
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| | elocationid:172 |
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| | pages:1-41 |
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| | extent:41 |
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| Fussnoten: | Gesehen am 30.04.2021 |
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| Titel Quelle: | Enthalten in: The astrophysical journal / 1 |
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| Ort Quelle: | London : Institute of Physics Publ., 1996 |
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| Jahr Quelle: | 2013 |
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| Band/Heft Quelle: | 768(2013), 2, Artikel-ID 172, Seite 1-41 |
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| ISSN Quelle: | 1538-4357 |
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| Abstract: | We present a homogeneous kinematic analysis of red giant branch stars within 18 of the 28 Andromeda dwarf spheroidal (dSph) galaxies, obtained using the Keck I LRIS and Keck II DEIMOS spectrographs. Based on their g-i colors (taken with the CFHT MegaCam imager), physical positions on the sky, and radial velocities, we assign probabilities of dSph membership to each observed star. Using this information, the velocity dispersions, central masses and central densities of the dark matter halos are calculated for these objects, and compared with the properties of the Milky Way dSph population. We also measure the average metallicity ([Fe/H]) from the co-added spectra of member stars for each M31 dSph and find that they are consistent with the trend of decreasing [Fe/H] with luminosity observed in the Milky Way population. We find that three of our studied M31 dSphs appear as significant outliers in terms of their central velocity dispersion, And XIX, XXI and XXV, all of which have large half-light radii (>700 pc) and low velocity dispersions (sigma_v<5 km/s). In addition, And XXV has a mass-to-light ratio within its half-light radius of just [M/L]_{half}=10.3^{+7.0}_{-6.7}, making it consistent with a simple stellar system with no appreciable dark matter component within its 1 sigma uncertainties. We suggest that the structure of the dark matter halos of these outliers have been significantly altered by tides. |
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| DOI: | doi:10.1088/0004-637X/768/2/172 |
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| URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Volltext ; Verlag: https://doi.org/10.1088/0004-637X/768/2/172 |
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| | Volltext: http://arxiv.org/abs/1302.6590 |
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| | DOI: https://doi.org/10.1088/0004-637X/768/2/172 |
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| Datenträger: | Online-Ressource |
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| Sprache: | eng |
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| Sach-SW: | Astrophysics - Astrophysics of Galaxies |
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| | Astrophysics - Cosmology and Nongalactic Astrophysics |
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| K10plus-PPN: | 1756721653 |
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| Verknüpfungen: | → Zeitschrift |
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¬A¬ kinematic study of the Andromeda dwarf spheroidal system / Collins, Michelle [VerfasserIn]; 26 Feb 2013 (Online-Ressource)
