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Date and Time of the Query: 2019-05-22 T14:03:35 PDT
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For refcode 2013ApJ...772...15M:
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2013ApJ...772...15M Lacerta I and Cassiopeia III. Two Luminous and Distant Andromeda Satellite Dwarf Galaxies Found in the 3pi Pan-STARRS1 Survey Martin, Nicolas F.; Slater, Colin T.; Schlafly, Edward F.; Morganson, Eric; Rix, Hans-Walter; Bell, Eric F.; Laevens, Benjamin P. M.; Bernard, Edouard J.; Ferguson, Annette M. N.; Finkbeiner, Douglas P.; Burgett, William S.; Chambers, Kenneth C.; Hodapp, Klaus W.; Kaiser, Nicholas; Kudritzki, Rolf-Peter; Magnier, Eugene A.; Morgan, Jeffrey S.; Price, Paul A.; Tonry, John L.; Wainscoat, Richard J. Abstract. 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 r_P1_- and i_P1_-band imaging data. Both are luminous systems (M_V_ ~ -12) located at projected distances of 20.^degree^3 and 10.^degree^5 from M31. Lac I and Cas III are likely satellites of the Andromeda galaxy with heliocentric distances of 756^{+44}_{-28}_\,kpc and 772^{+61}_{-56}_\,kpc, respectively, and corresponding M31-centric distances of 275 +/- 7 kpc and 144^{+6}_{-4}_\,kpc. The brightest of recent Local Group member discoveries, these two new dwarf galaxies owe their late discovery to their large sizes (r_h = 4.2^{+0.4}_{-0.5}_ arcmin or 912^{+124}_{-93}_\,pc for Lac I r_h = 6.5^{+1.2}_{-1.0}_ arcmin or 1456 +/- 267 pc for Cas III) and consequently low surface brightness (mu_0_ ~ 26.0 mag arcsec^-2^), 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 3pi Pan-STARRS1 survey, which could lead to the discovery of other distant Andromeda satellite dwarf galaxies. Key words: galaxies: individual: Andromeda XXXI Andromeda XXXII Cassiopeia III Lacerta I, Local Group
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