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Ships Passing in the Night: Spectroscopic Analysis of Two Ultra-faint Satellites in the Constellation Carina

Li, T. S., Simon, J. D., Pace, A. B., Torrealba, G., Kuehn, K., Drlica-Wagner, A., Bechtol, K., Vivas, A. K., Marel, R. P. van der, Wood, M. , Yanny, B., Belokurov, V., Jethwa, P., Zucker, D. B., Lewis, G., Kron, R., Nidever, D. L., Sánchez-Conde, M. A., Ji, A. P., Conn, B. C., James, D. J., Martin, N. F., Martinez-Delgado, D. and Noel, N. E. D. (2018) Ships Passing in the Night: Spectroscopic Analysis of Two Ultra-faint Satellites in the Constellation Carina The Astrophysical Journal, 857 (2), 145.

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We report the discovery of two ultra-faint satellites in the vicinity of the Large Magellanic Cloud (LMC) in data from the Magellanic Satellites Survey (MagLiteS ). Situated 18 deg (∼20 kpc) from the LMC and separated from each other by only 18 arcmin, Carina II and III form an intriguing pair. By simultaneously modelling the spatial and the colour–magnitude stellar distributions, we find that both Carina II and Carina III are likely dwarf galaxies, although this is less clear for Carina III. There are in fact several obvious differences between the two satellites. While both are well described by an old and metal poor population, Carina II is located at ∼36 kpc from the Sun, with MV ∼ −4.5 and rh ∼ 90 pc, and it is further confirmed by the discovery of 3 RR Lyrae at the right distance. In contrast, Carina III is much more elongated, measured to be fainter (MV ∼ −2.4), significantly more compact (rh ∼ 30 pc), and closer to the Sun, at ∼28 kpc, placing it only 8 kpc away from Car II. Together with several other systems detected by the Dark Energy Camera, Carina II and III form a strongly anisotropic cloud of satellites in the vicinity of the Magellanic Clouds.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Li, T. S.
Simon, J. D.
Pace, A. B.
Torrealba, G.
Kuehn, K.
Drlica-Wagner, A.
Bechtol, K.
Vivas, A. K.
Marel, R. P. van der
Wood, M.
Yanny, B.
Belokurov, V.
Jethwa, P.
Zucker, D. B.
Lewis, G.
Kron, R.
Nidever, D. L.
Sánchez-Conde, M. A.
Ji, A. P.
Conn, B. C.
James, D. J.
Martin, N. F.
Martinez-Delgado, D.
Noel, N. E.
Date : 23 January 2018
Funders : Spanish Ministry of Economy and Competitiveness, European Union’s Seventh Framework Programme, Australian Research Council
DOI : 10.3847/1538-4357/aab666
Grant Title : Spanish Ministry of Economy and Competitiveness
Uncontrolled Keywords : Galaxy: halo, galaxies: dwarf, Magellanic Clouds
Additional Information : Embargo OK Metadata OK No Further Action
Depositing User : James Marshall
Date Deposited : 21 Aug 2020 09:15
Last Modified : 21 Aug 2020 09:15

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