An ultra-faint galaxy candidate discovered in early data from the Magellanic Satellites Survey
Abstract
Here, 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.
- Authors:
-
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- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Wisconsin IceCube Particle Astrophysics Center (WIPAC), Madison, WI (United States); Univ. of Wisconsin-Madison, Madison, WI (United States)
- Univ. of Illinois, Urbana, IL (United States); National Center for Supercomputing Applications, Urbana, IL (United States)
- National Center for Supercomputing Applications, Urbana, IL (United States)
- National Optical Astronomy Observatory, La Serena (Chile)
- National Optical Astronomy Observatory, Tucson, AZ (United States)
- Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Univ. Potsdam, Potsdam (Germany); Leibnitz-Institut fur Astrophysik Potsdam, Potsdam (Germany); Univ. of Hertfordshire, Hatfield (United Kingdom)
- Mount Stromlo Observatory, Weston Creek, ACT (Australia)
- Australian Astronomical Observatory, North Ryde, NSW (Australia)
- Univ. of Pittsburgh, Pittsburgh, PA (United States)
- Univ. de Strasbourg, Strasbourg (France); Max-Planck-Institut fur Astronomie, Heidelberg (Germany)
- Univ. of Surrey, Guildford (United Kingdom)
- Instituto de Fisica, Porto Alegre (Brazil); Lab. Interinstitucional de e-Astronomia - LIne A, Rio de Janeiro (Brazil)
- Carnegie Observatories, Pasadena, CA (United States)
- Univ. of Colorado, Boulder, CO (United States)
- Space Telescope Science Institute, Baltimore, MD (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1335137
- Alternate Identifier(s):
- OSTI ID: 1368583
- Report Number(s):
- FERMILAB-PUB-16-353-AE; arXiv:1609.02148
Journal ID: ISSN 2041-8213; 1485663
- Grant/Contract Number:
- AC02-07CH11359; AC02-76SF00515
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- The Astrophysical Journal. Letters (Online)
- Additional Journal Information:
- Journal Volume: 833; Journal Issue: 1; Journal ID: ISSN 2041-8213
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; galaxies: dwarf; Local Group; Magellanic Clouds
Citation Formats
Drlica-Wagner, A., Bechtol, Keith, Allam, S., Tucker, D. L., Gruendl, R. A., Johnson, M. D., Walker, A. R., James, D. J., Nidever, D. L., Olsen, K. A. G., Wechsler, R. H., Cioni, M. R. L., Conn, B. C., Kuehn, K., Li, T. S., Mao, Y. -Y., Martin, N. F., Neilsen, E., Noel, N. E. D., Pieres, A., Simon, J. D., Stringfellow, G. S., Marel, R. P. van der, and Yanny, B. An ultra-faint galaxy candidate discovered in early data from the Magellanic Satellites Survey. United States: N. p., 2016.
Web. doi:10.3847/2041-8205/833/1/L5.
Drlica-Wagner, A., Bechtol, Keith, Allam, S., Tucker, D. L., Gruendl, R. A., Johnson, M. D., Walker, A. R., James, D. J., Nidever, D. L., Olsen, K. A. G., Wechsler, R. H., Cioni, M. R. L., Conn, B. C., Kuehn, K., Li, T. S., Mao, Y. -Y., Martin, N. F., Neilsen, E., Noel, N. E. D., Pieres, A., Simon, J. D., Stringfellow, G. S., Marel, R. P. van der, & Yanny, B. An ultra-faint galaxy candidate discovered in early data from the Magellanic Satellites Survey. United States. https://doi.org/10.3847/2041-8205/833/1/L5
Drlica-Wagner, A., Bechtol, Keith, Allam, S., Tucker, D. L., Gruendl, R. A., Johnson, M. D., Walker, A. R., James, D. J., Nidever, D. L., Olsen, K. A. G., Wechsler, R. H., Cioni, M. R. L., Conn, B. C., Kuehn, K., Li, T. S., Mao, Y. -Y., Martin, N. F., Neilsen, E., Noel, N. E. D., Pieres, A., Simon, J. D., Stringfellow, G. S., Marel, R. P. van der, and Yanny, B. 2016.
"An ultra-faint galaxy candidate discovered in early data from the Magellanic Satellites Survey". United States. https://doi.org/10.3847/2041-8205/833/1/L5. https://www.osti.gov/servlets/purl/1335137.
@article{osti_1335137,
title = {An ultra-faint galaxy candidate discovered in early data from the Magellanic Satellites Survey},
author = {Drlica-Wagner, A. and Bechtol, Keith and Allam, S. and Tucker, D. L. and Gruendl, R. A. and Johnson, M. D. and Walker, A. R. and James, D. J. and Nidever, D. L. and Olsen, K. A. G. and Wechsler, R. H. and Cioni, M. R. L. and Conn, B. C. and Kuehn, K. and Li, T. S. and Mao, Y. -Y. and Martin, N. F. and Neilsen, E. and Noel, N. E. D. and Pieres, A. and Simon, J. D. and Stringfellow, G. S. and Marel, R. P. van der and Yanny, B.},
abstractNote = {Here, 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.},
doi = {10.3847/2041-8205/833/1/L5},
url = {https://www.osti.gov/biblio/1335137},
journal = {The Astrophysical Journal. Letters (Online)},
issn = {2041-8213},
number = 1,
volume = 833,
place = {United States},
year = {Wed Nov 30 00:00:00 EST 2016},
month = {Wed Nov 30 00:00:00 EST 2016}
}
Web of Science
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