Discovery of two neighbouring satellites in the Carina constellation with MagLiteS

G. Torrealba; V. Belokurov; S. E. Koposov; K. Bechtol; A. Drlica-Wagner; K. A.G. Olsen; A. K. Vivas; B. Yanny; P. Jethwa; A. R. Walker; T. S. Li; S. Allam; B. C. Conn; C. Gallart; R. A. Gruendl; D. J. James; M. D. Johnson; K. Kuehn; N. Kuropatkin; N. F. Martin; D. Martinez-Delgado; D. L. Nidever; N. E.D. Nöel; J. D. Simon; G. S. Stringfellow; D. L. Tucker

doi:10.1093/MNRAS/STY170

Discovery of two neighbouring satellites in the Carina constellation with MagLiteS

G. Torrealba, V. Belokurov, S. E. Koposov, K. Bechtol, A. Drlica-Wagner, K. A.G. Olsen, A. K. Vivas, B. Yanny, P. Jethwa, A. R. Walker, T. S. Li, S. Allam, B. C. Conn, C. Gallart, R. A. Gruendl, D. J. James, M. D. Johnson, K. Kuehn, N. Kuropatkin, N. F. MartinD. Martinez-Delgado, D. L. Nidever, N. E.D. Nöel, J. D. Simon, G. S. Stringfellow, D. L. Tucker

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Abstract

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 bothCarina 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 M_V ~-4.5 and r_h ~ 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 (M_V ~ -2.4), significantly more compact (r_h ~ 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.

Original language	English (US)
Pages (from-to)	5085-5097
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	475
Issue number	4
DOIs	https://doi.org/10.1093/MNRAS/STY170
State	Published - Apr 21 2018

Keywords

Galaxies: dwarf
Galaxy: halo
Magellanic Clouds

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Online availability

10.1093/MNRAS/STY170

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Torrealba, G., Belokurov, V., Koposov, S. E., Bechtol, K., Drlica-Wagner, A., Olsen, K. A. G., Vivas, A. K., Yanny, B., Jethwa, P., Walker, A. R., Li, T. S., Allam, S., Conn, B. C., Gallart, C., Gruendl, R. A., James, D. J., Johnson, M. D., Kuehn, K., Kuropatkin, N., ... Tucker, D. L. (2018). Discovery of two neighbouring satellites in the Carina constellation with MagLiteS. Monthly Notices of the Royal Astronomical Society, 475(4), 5085-5097. https://doi.org/10.1093/MNRAS/STY170

Torrealba, G, Belokurov, V, Koposov, SE, Bechtol, K, Drlica-Wagner, A, Olsen, KAG, Vivas, AK, Yanny, B, Jethwa, P, Walker, AR, Li, TS, Allam, S, Conn, BC, Gallart, C, Gruendl, RA, James, DJ, Johnson, MD, Kuehn, K, Kuropatkin, N, Martin, NF, Martinez-Delgado, D, Nidever, DL, Nöel, NED, Simon, JD, Stringfellow, GS & Tucker, DL 2018, 'Discovery of two neighbouring satellites in the Carina constellation with MagLiteS', Monthly Notices of the Royal Astronomical Society, vol. 475, no. 4, pp. 5085-5097. https://doi.org/10.1093/MNRAS/STY170

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title = "Discovery of two neighbouring satellites in the Carina constellation with MagLiteS",

abstract = "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 bothCarina 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.",

keywords = "Galaxies: dwarf, Galaxy: halo, Magellanic Clouds",

author = "G. Torrealba and V. Belokurov and Koposov, {S. E.} and K. Bechtol and A. Drlica-Wagner and Olsen, {K. A.G.} and Vivas, {A. K.} and B. Yanny and P. Jethwa and Walker, {A. R.} and Li, {T. S.} and S. Allam and Conn, {B. C.} and C. Gallart and Gruendl, {R. A.} and James, {D. J.} and Johnson, {M. D.} and K. Kuehn and N. Kuropatkin and Martin, {N. F.} and D. Martinez-Delgado and Nidever, {D. L.} and N{\"o}el, {N. E.D.} and Simon, {J. D.} and Stringfellow, {G. S.} and Tucker, {D. L.}",

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T1 - Discovery of two neighbouring satellites in the Carina constellation with MagLiteS

AU - Torrealba, G.

AU - Belokurov, V.

AU - Koposov, S. E.

AU - Bechtol, K.

AU - Drlica-Wagner, A.

AU - Olsen, K. A.G.

AU - Vivas, A. K.

AU - Yanny, B.

AU - Jethwa, P.

AU - Walker, A. R.

AU - Li, T. S.

AU - Allam, S.

AU - Conn, B. C.

AU - Gallart, C.

AU - Gruendl, R. A.

AU - James, D. J.

AU - Johnson, M. D.

AU - Kuehn, K.

AU - Kuropatkin, N.

AU - Martin, N. F.

AU - Martinez-Delgado, D.

AU - Nidever, D. L.

AU - Nöel, N. E.D.

AU - Simon, J. D.

AU - Stringfellow, G. S.

AU - Tucker, D. L.

PY - 2018/4/21

Y1 - 2018/4/21

N2 - 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 bothCarina 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.

AB - 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 bothCarina 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.

KW - Galaxies: dwarf

KW - Galaxy: halo

KW - Magellanic Clouds

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U2 - 10.1093/MNRAS/STY170

DO - 10.1093/MNRAS/STY170

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AN - SCOPUS:85045890270

SN - 0035-8711

VL - 475

SP - 5085

EP - 5097

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

Discovery of two neighbouring satellites in the Carina constellation with MagLiteS

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