AN ULTRA-FAINT GALAXY CANDIDATE DISCOVERED in EARLY DATA from the MAGELLANIC SATELLITES SURVEY

A. Drlica-Wagner; Keith Bechtol; S. Allam; D. L. Tucker; R. A. Gruendl; M. D. Johnson; A. R. Walker; D. J. James; D. L. Nidever; K. A G Olsen; R. H. Wechsler; M. R L Cioni; B. C. Conn; K. Kuehn; T. S. Li; Y. Y. Mao; N. F. Martin; E. Neilsen; N. E D Noel; A. Pieres; J. D. Simon; G. S. Stringfellow; R. P Van Der Marel; B. Yanny

doi:10.3847/2041-8205/833/1/L5

AN ULTRA-FAINT GALAXY CANDIDATE DISCOVERED in EARLY DATA from the MAGELLANIC SATELLITES SURVEY

A. Drlica-Wagner, Keith Bechtol, S. Allam, D. L. Tucker, R. A. Gruendl, M. D. Johnson, A. R. Walker, D. J. James, D. L. Nidever, K. A G Olsen, R. H. Wechsler, M. R L Cioni, B. C. Conn, K. Kuehn, T. S. Li, Y. Y. Mao, N. F. Martin, E. Neilsen, N. E D Noel, A. PieresJ. D. Simon, G. S. Stringfellow, R. P Van Der Marel, B. Yanny

Centre for Astrophysics Research (CAR)

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Abstract

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 (μ = 28.5⁺¹ _-1 mag arcsec^-2 within its half-light radius) resolved overdensity of old and metal-poor stars located at a heliocentric distance of 45⁺⁵ _-4 kpc. The physical size (r1/2 = 46⁺¹⁵ _-11) and low luminosity (M_v = -3.2^+0.4 _-0.5 mag) of this satellite are consistent with the locus of spectroscopically confirmed ultra-faint galaxies. MagLiteS J0644-5953 (Pic II) is located 11.3^+3.1 _-0.9 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.

Original language	English
Article number	L5
Number of pages	7
Journal	Astrophysical Journal Letters
Volume	833
Issue number	1
Early online date	30 Nov 2016
DOIs	https://doi.org/10.3847/2041-8205/833/1/L5
Publication status	Published - 10 Dec 2016

Keywords

galaxies: dwarf
Local Group
Magellanic Clouds

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10.3847/2041-8205/833/1/L5Licence: Other

Drlica-Wagner_2016_ApJL_833_L5
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https://arxiv.org/abs/1609.02148Licence: Other

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Drlica-Wagner, A., Bechtol, K., 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., ... Yanny, B. (2016). AN ULTRA-FAINT GALAXY CANDIDATE DISCOVERED in EARLY DATA from the MAGELLANIC SATELLITES SURVEY. Astrophysical Journal Letters, 833(1), Article L5. https://doi.org/10.3847/2041-8205/833/1/L5

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title = "AN ULTRA-FAINT GALAXY CANDIDATE DISCOVERED in EARLY DATA from the MAGELLANIC SATELLITES SURVEY",

abstract = "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 (μ = 28.5+1 -1 mag arcsec-2 within its half-light radius) resolved overdensity of old and metal-poor stars located at a heliocentric distance of 45+5 -4 kpc. The physical size (r1/2 = 46+15 -11) and low luminosity (Mv = -3.2+0.4 -0.5 mag) of this satellite are consistent with the locus of spectroscopically confirmed ultra-faint galaxies. MagLiteS J0644-5953 (Pic II) is located 11.3+3.1 -0.9 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.",

keywords = "galaxies: dwarf, Local Group, Magellanic Clouds",

author = "A. Drlica-Wagner and Keith Bechtol and S. Allam 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 K. Kuehn and Li, {T. S.} and Mao, {Y. Y.} and Martin, {N. F.} and E. Neilsen and Noel, {N. E D} and A. Pieres and Simon, {J. D.} and Stringfellow, {G. S.} and Marel, {R. P Van Der} and B. Yanny",

year = "2016",

month = dec,

day = "10",

doi = "10.3847/2041-8205/833/1/L5",

language = "English",

volume = "833",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

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Drlica-Wagner, A, Bechtol, K, Allam, S, Tucker, DL, Gruendl, RA, Johnson, MD, Walker, AR, James, DJ, Nidever, DL, Olsen, KAG, Wechsler, RH, Cioni, MRL, Conn, BC, Kuehn, K, Li, TS, Mao, YY, Martin, NF, Neilsen, E, Noel, NED, Pieres, A, Simon, JD, Stringfellow, GS, Marel, RPVD & Yanny, B 2016, 'AN ULTRA-FAINT GALAXY CANDIDATE DISCOVERED in EARLY DATA from the MAGELLANIC SATELLITES SURVEY', Astrophysical Journal Letters, vol. 833, no. 1, L5. https://doi.org/10.3847/2041-8205/833/1/L5

TY - JOUR

T1 - AN ULTRA-FAINT GALAXY CANDIDATE DISCOVERED in EARLY DATA from the MAGELLANIC SATELLITES SURVEY

AU - Drlica-Wagner, A.

AU - Bechtol, Keith

AU - Allam, S.

AU - Tucker, D. L.

AU - Gruendl, R. A.

AU - Johnson, M. D.

AU - Walker, A. R.

AU - James, D. J.

AU - Nidever, D. L.

AU - Olsen, K. A G

AU - Wechsler, R. H.

AU - Cioni, M. R L

AU - Conn, B. C.

AU - Kuehn, K.

AU - Li, T. S.

AU - Mao, Y. Y.

AU - Martin, N. F.

AU - Neilsen, E.

AU - Noel, N. E D

AU - Pieres, A.

AU - Simon, J. D.

AU - Stringfellow, G. S.

AU - Marel, R. P Van Der

AU - Yanny, B.

PY - 2016/12/10

Y1 - 2016/12/10

N2 - 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 (μ = 28.5+1 -1 mag arcsec-2 within its half-light radius) resolved overdensity of old and metal-poor stars located at a heliocentric distance of 45+5 -4 kpc. The physical size (r1/2 = 46+15 -11) and low luminosity (Mv = -3.2+0.4 -0.5 mag) of this satellite are consistent with the locus of spectroscopically confirmed ultra-faint galaxies. MagLiteS J0644-5953 (Pic II) is located 11.3+3.1 -0.9 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.

AB - 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 (μ = 28.5+1 -1 mag arcsec-2 within its half-light radius) resolved overdensity of old and metal-poor stars located at a heliocentric distance of 45+5 -4 kpc. The physical size (r1/2 = 46+15 -11) and low luminosity (Mv = -3.2+0.4 -0.5 mag) of this satellite are consistent with the locus of spectroscopically confirmed ultra-faint galaxies. MagLiteS J0644-5953 (Pic II) is located 11.3+3.1 -0.9 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.

KW - galaxies: dwarf

KW - Local Group

KW - Magellanic Clouds

UR - http://www.scopus.com/inward/record.url?scp=85006365124&partnerID=8YFLogxK

U2 - 10.3847/2041-8205/833/1/L5

DO - 10.3847/2041-8205/833/1/L5

M3 - Article

AN - SCOPUS:85006365124

SN - 2041-8205

VL - 833

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

M1 - L5

ER -

AN ULTRA-FAINT GALAXY CANDIDATE DISCOVERED in EARLY DATA from the MAGELLANIC SATELLITES SURVEY

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Keywords

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