TY - JOUR
T1 - Perseus I: A Distant Satellite Dwarf Galaxy of Andromeda
AU - Martin, Nicolas F.
AU - Schlafly, Edward F.
AU - Slater, Colin T.
AU - Bernard, Edouard J.
AU - Rix, Hans-Walter
AU - Bell, Eric F.
AU - Ferguson, Annette M. N.
AU - Finkbeiner, Douglas P.
AU - Laevens, Benjamin P. M.
AU - Burgett, William S.
AU - Chambers, Kenneth C.
AU - Draper, Peter W.
AU - Hodapp, Klaus W.
AU - Kaiser, Nicholas
AU - Kudritzki, Rolf-Peter
AU - Magnier, Eugene A.
AU - Metcalfe, Nigel
AU - Morgan, Jeffrey S.
AU - Price, Paul A.
AU - Tonry, John L.
AU - Wainscoat, Richard J.
AU - Waters, Christopher
PY - 2013/12/1
Y1 - 2013/12/1
N2 - We present the discovery of a new dwarf galaxy, Perseus I/Andromeda
XXXIII, found in the vicinity of Andromeda (M31) in stacked imaging data
from the Pan-STARRS1 3π survey. Located 27.°9 away from M31,
Perseus I has a heliocentric distance of 785 ± 65 kpc, compatible
with it being a satellite of M31 at 374^{+14}_{-10}\,kpc from its host.
The properties of Perseus I are typical for a reasonably bright dwarf
galaxy (MV = -10.3 ± 0.7), with an exponential
half-light radius of rh = 1.7 ± 0.4 arcmin or r_h =
400^{+105}_{-85}\,pc at this distance, and a moderate ellipticity
(\epsilon = 0.43^{+0.15}_{-0.17}). The late discovery of Perseus I is
due to its fairly low surface brightness (\mu _0=25.7^{+1.0}_{-0.9} mag
arcsec-2), and to the previous lack of deep, high
quality photometric data in this region. If confirmed to be a companion
of M31, the location of Perseus I, far east from its host, could place
interesting constraints on the bulk motion of the satellite system of
M31.
AB - We present the discovery of a new dwarf galaxy, Perseus I/Andromeda
XXXIII, found in the vicinity of Andromeda (M31) in stacked imaging data
from the Pan-STARRS1 3π survey. Located 27.°9 away from M31,
Perseus I has a heliocentric distance of 785 ± 65 kpc, compatible
with it being a satellite of M31 at 374^{+14}_{-10}\,kpc from its host.
The properties of Perseus I are typical for a reasonably bright dwarf
galaxy (MV = -10.3 ± 0.7), with an exponential
half-light radius of rh = 1.7 ± 0.4 arcmin or r_h =
400^{+105}_{-85}\,pc at this distance, and a moderate ellipticity
(\epsilon = 0.43^{+0.15}_{-0.17}). The late discovery of Perseus I is
due to its fairly low surface brightness (\mu _0=25.7^{+1.0}_{-0.9} mag
arcsec-2), and to the previous lack of deep, high
quality photometric data in this region. If confirmed to be a companion
of M31, the location of Perseus I, far east from its host, could place
interesting constraints on the bulk motion of the satellite system of
M31.
KW - galaxies: individual: Perseus I Andromeda XXXIII
KW - Local Group
M3 - Article
VL - 779
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
ER -