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Discovery of two neighbouring satellites in the Carina constellation with MagLiteS

Journal Article · · Mon.Not.Roy.Astron.Soc.
DOI:https://doi.org/10.1093/mnras/sty170· OSTI ID:1438044
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [5];  [8];  [7];  [5];  [5];  [9];  [10];  [11];  [12];  [13];  [14];  [5];  [15] more »;  [16];  [6];  [17];  [18];  [19];  [5] « less
  1. Cambridge U., Inst. of Astron.; Taipei, Inst. Astron. Astrophys.
  2. Cambridge U., Inst. of Astron.; CCA, New York
  3. Carnegie Mellon U.; Cambridge U., Inst. of Astron.
  4. Large Binocular Telescope, Tucson
  5. Fermilab
  6. NRAO, Tucson
  7. Cerro-Tololo InterAmerican Obs.
  8. Cambridge U., Inst. of Astron.
  9. Res. Sch. Astron. Astrophys., Weston Creek
  10. IAC, La Laguna; Laguna U., Tenerife
  11. Illinois U., Urbana, Astron. Dept.; NCSA, Urbana
  12. Harvard-Smithsonian Ctr. Astrophys.
  13. NCSA, Urbana
  14. Australian Astron. Observ.
  15. Strasbourg Observ.; Heidelberg, Max Planck Inst. Astron.
  16. Heidelberg, Astron. Rechen Inst.
  17. Surrey U.
  18. Carnegie Inst. Observ.
  19. Colorado U.
+ Show Author Affiliations
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 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.
Research Organization:
Australian Astron. Observ.; CCA, New York; Cambridge U., Inst. of Astron.; Carnegie Inst. Observ.; Carnegie Mellon U.; Cerro-Tololo InterAmerican Obs.; Colorado U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Harvard-Smithsonian Ctr. Astrophys.; Heidelberg, Astron. Rechen Inst.; Heidelberg, Max Planck Inst. Astron.; IAC, La Laguna; Illinois U., Urbana, Astron. Dept.; Laguna U., Tenerife; Large Binocular Telescope, Tucson; NCSA, Urbana; NRAO, Tucson; Res. Sch. Astron. Astrophys., Weston Creek; Strasbourg Observ.; Surrey U.; Taipei, Inst. Astron. Astrophys.
Sponsoring Organization:
US Department of Energy
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1438044
Report Number(s):
FERMILAB-PUB-18-156-AE-CD; oai:inspirehep.net:1671470; arXiv:1801.07279
Journal Information:
Mon.Not.Roy.Astron.Soc., Journal Name: Mon.Not.Roy.Astron.Soc. Journal Issue: 4 Vol. 475
Country of Publication:
United States
Language:
English

Figures / Tables (10)

Figure 1(p. 2)figure Figure 1
Figure 2(p. 3)figure Figure 2
Figure 3(p. 5)figure Figure 3
Table 1(p. 5)table Table 1
Figure 4(p. 7)figure Figure 4
Table 2(p. 7)table Table 2
Figure 5(p. 9)figure Figure 5
Figure 6(p. 10)figure Figure 6
Figure 7(p. 11)figure Figure 7
Table A1(p. 14)table Table A1

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Galaxy: halo
Magellanic Clouds
galaxies: dwarf