Astrophys. J., 772, 15 (2013/July-3)
Lacerta I and Cassiopeia III. Two luminous and distant Andromeda satellite dwarf galaxies found in the 3π Pan-STARRS1 survey.
MARTIN N.F., SLATER C.T., SCHLAFLY E.F., MORGANSON E., RIX H.-W., BELL E.F., LAEVENS B.P.M., BERNARD E.J., FERGUSON A.M.N., FINKBEINER D.P., BURGETT W.S., CHAMBERS K.C., HODAPP K.W., KAISER N., KUDRITZKI R.-P., MAGNIER E.A., MORGAN J.S., PRICE P.A., TONRY J.L. and WAINSCOAT R.J.
Abstract (from CDS):
We report the discovery of two new dwarf galaxies, Lacerta I/Andromeda XXXI (Lac I/And XXXI) and Cassiopeia III/Andromeda XXXII (Cas III/And XXXII), in stacked Pan-STARRS1 rP1- and iP1-band imaging data. Both are luminous systems (MV∼ -12) located at projected distances of 20.°3 and 10.°5 from M31. Lac I and Cas III are likely satellites of the Andromeda galaxy with heliocentric distances of 756–28+44 kpc and 772–5661, respectively, and corresponding M31-centric distances of 275±7 kpc and 1444_+6. The brightest of recent Local Group member discoveries, these two new dwarf galaxies owe their late discovery to their large sizes (rh = 4.2–0.5+0.4 arcmin or 912–93+124 pc for Lac I; rh = 6.5–1.0+1.2 arcmin or 1456±267 pc for Cas III) and consequently low surface brightness (µ0∼ 26.0 mag/arcsec2), as well as to the lack of a systematic survey of regions at large radii from M31, close to the Galactic plane. This latter limitation is now alleviated by the 3π Pan-STARRS1 survey, which could lead to the discovery of other distant Andromeda satellite dwarf galaxies.
galaxies: individual (Andromeda XXXI, Andromeda XXXII, Cassiopeia III, Lacerta I) - Local Group
And R (Nos XXXI-XXXII) added. NAME Lacerta I N=1. NAME Cassiopeia III N=1.
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