TY - JOUR
T1 - A peculiar faint satellite in the remote outer halo of M31
AU - Mackey, A. D.
AU - Huxor, A. P.
AU - Martin, N. F.
AU - Ferguson, A. M.N.
AU - Dotter, A.
AU - McConnachie, A. W.
AU - Ibata, R. A.
AU - Irwin, M. J.
AU - Lewis, G. F.
AU - Sakari, C. M.
AU - Tanvir, N. R.
AU - Venn, K. A.
PY - 2013/6/20
Y1 - 2013/6/20
N2 - We present Hubble Space Telescope imaging of a newly discovered faint stellar system, PAndAS-48, in the outskirts of the M31 halo. Our photometry reveals this object to be comprised of an ancient and very metal-poor stellar population with age ≳ 10 Gyr and [Fe/H] ≲ -2.3. Our inferred distance modulus (m-M)0 = 24.57 ± 0.11 confirms that PAndAS-48 is most likely a remote M31 satellite with a three-dimensional galactocentric radius of kpc. We observe an apparent spread in color on the upper red giant branch that is larger than the photometric uncertainties should allow, and briefly explore the implications of this. Structurally, PAndAS-48 is diffuse, faint, and moderately flattened, with a half-light radius pc, integrated luminosity M V = -4.8 ± 0.5, and ellipticity . On the size-luminosity plane it falls between the extended globular clusters seen in several nearby galaxies and the recently discovered faint dwarf satellites of the Milky Way; however, its characteristics do not allow us to unambiguously classify it as either type of system. If PAndAS-48 is a globular cluster then it is among the most elliptical, isolated, and metal-poor of any seen in the Local Group, extended or otherwise. Conversely, while its properties are generally consistent with those observed for the faint Milky Way dwarfs, it would be a factor of ∼2-3 smaller in spatial extent than any known counterpart of comparable luminosity.
AB - We present Hubble Space Telescope imaging of a newly discovered faint stellar system, PAndAS-48, in the outskirts of the M31 halo. Our photometry reveals this object to be comprised of an ancient and very metal-poor stellar population with age ≳ 10 Gyr and [Fe/H] ≲ -2.3. Our inferred distance modulus (m-M)0 = 24.57 ± 0.11 confirms that PAndAS-48 is most likely a remote M31 satellite with a three-dimensional galactocentric radius of kpc. We observe an apparent spread in color on the upper red giant branch that is larger than the photometric uncertainties should allow, and briefly explore the implications of this. Structurally, PAndAS-48 is diffuse, faint, and moderately flattened, with a half-light radius pc, integrated luminosity M V = -4.8 ± 0.5, and ellipticity . On the size-luminosity plane it falls between the extended globular clusters seen in several nearby galaxies and the recently discovered faint dwarf satellites of the Milky Way; however, its characteristics do not allow us to unambiguously classify it as either type of system. If PAndAS-48 is a globular cluster then it is among the most elliptical, isolated, and metal-poor of any seen in the Local Group, extended or otherwise. Conversely, while its properties are generally consistent with those observed for the faint Milky Way dwarfs, it would be a factor of ∼2-3 smaller in spatial extent than any known counterpart of comparable luminosity.
KW - galaxies: dwarf
KW - galaxies: individual (M31)
KW - globular clusters: general
KW - Local Group
UR - http://www.scopus.com/inward/record.url?scp=84879119289&partnerID=8YFLogxK
U2 - 10.1088/2041-8205/770/2/L17
DO - 10.1088/2041-8205/770/2/L17
M3 - Article (Academic Journal)
AN - SCOPUS:84879119289
SN - 2041-8205
VL - 770
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 2
M1 - L17
ER -