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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693579.0, MPI für Astronomie / Publikationen_mpia
Lacerta I and Cassiopeia III. Two luminous and distant Andromeda satellite dwarf galaxies found in the 3π Pan-STARRS1 Survey
Authors: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.; Wainscoat, R. J.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:The Astrophysical Journal
Issue / Number:1
Start Page:id. 15 (6 pp)
Audience:Not Specified
Abstract / Description: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 (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^{+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 (μ0 ~ 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 3π Pan-STARRS1 survey, which could lead to the discovery of other distant Andromeda satellite dwarf galaxies.
Free Keywords:galaxies: individual: Andromeda XXXI Andromeda XXXII Cassiopeia III Lacerta I; Local Group
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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