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An Ultra-Faint Galaxy Candidate Discovered in Early Data from the Magellanic Satellites Survey

Journal Article · · Astrophys.J.Lett.
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  1. Fermilab
  2. Particle Beam Lasers, Madison; Wisconsin U., Madison
  3. Illinois U., Urbana, Astron. Dept.; Illinois U., Urbana
  4. Illinois U., Urbana
  5. Cerro-Tololo InterAmerican Obs.
  6. Natl. Solar Observ., Tucson
  7. Stanford U., Phys. Dept.; KIPAC, Menlo Park; SLAC
  8. Hertfordshire U.; Potsdam, Astrophys. Inst.; Potsdam U.
  9. Res. Sch. Astron. Astrophys., Weston Creek
  10. Australia, CSIRO, North Ryde
  11. Pittsburgh U.
  12. Louis Pasteur U., Strasbourg I; Heidelberg, Max Planck Inst. Astron.
  13. Surrey U.
  14. Rio Grande do Sul U.; LIneA, Rio de Janeiro
  15. Carnegie Inst. Observ.
  16. Colorado U.
  17. Baltimore, Space Telescope Sci.
+ Show Author Affiliations
We report a new ultra-faint stellar system found in Dark Energy Camera data from the first observing run of the Magellanic Satellites Survey (MagLiteS). MagLiteS  J0644−5953 (Pictor II or Pic II) is a low surface brightness ($$\mu ={28.5}_{-1}^{+1}\,\mathrm{mag}\,\,\mathrm{arcsec}{}^{-2}$$ within its half-light radius) resolved overdensity of old and metal-poor stars located at a heliocentric distance of $${45}_{-4}^{+5}\,\mathrm{kpc}$$. The physical size ($${r}_{1/2}={46}_{-11}^{+15}\,\mathrm{pc}\,$$) and low luminosity ($${M}_{V}=-{3.2}_{-0.5}^{+0.4}\,\mathrm{mag}\,$$) of this satellite are consistent with the locus of spectroscopically confirmed ultra-faint galaxies. MagLiteS  J0644−5953 (Pic II) is located $${11.3}_{-0.9}^{+3.1}\,\mathrm{kpc}\,$$ from the Large Magellanic Cloud (LMC), and comparisons with simulation results in the literature suggest that this satellite was likely accreted with the LMC. The close proximity of MagLiteS  J0644−5953 (Pic II) to the LMC also makes it the most likely ultra-faint galaxy candidate to still be gravitationally bound to the LMC.
Research Organization:
Australia, CSIRO, North Ryde; Baltimore, Space Telescope Sci.; Carnegie Inst. Observ.; Cerro-Tololo InterAmerican Obs.; Colorado U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Heidelberg, Max Planck Inst. Astron.; Hertfordshire U.; Illinois U., Urbana; Illinois U., Urbana, Astron. Dept.; LIneA, Rio de Janeiro; Louis Pasteur U., Strasbourg I; Natl. Solar Observ., Tucson; Particle Beam Lasers, Madison; Pittsburgh U.; Potsdam U.; Potsdam, Astrophys. Inst.; Res. Sch. Astron. Astrophys., Weston Creek; Rio Grande do Sul U.; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford U., Phys. Dept.; Surrey U.; Wisconsin U., Madison
Sponsoring Organization:
US Department of Energy; USDOE
Grant/Contract Number:
AC02-07CH11359; AC02-76SF00515
OSTI ID:
1335137
Alternate ID(s):
OSTI ID: 1368583
OSTI ID: 22868411
Report Number(s):
FERMILAB-PUB-16-353-AE; oai:inspirehep.net:1485663; arXiv:1609.02148
Journal Information:
Astrophys.J.Lett., Journal Name: Astrophys.J.Lett. Journal Issue: 1 Vol. 833
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Local Group
Magellanic Clouds
galaxies: dwarf