Lacerta i and cassiopeia III. Two luminous and distant andromeda satellite dwarf galaxies found in the 3π pan-starrs1 survey

Nicolas F. Martin*, Colin T. Slater, Edward F. Schlafly, Eric Morganson, Hans Walter Rix, Eric F. Bell, Benjamin P M Laevens, Edouard J. Bernard, Annette M N Ferguson, Douglas P. Finkbeiner, William S. Burgett, Kenneth C. Chambers, Klaus W. Hodapp, Nicholas Kaiser, Rolf Peter Kudritzki, Eugene A. Magnier, Jeffrey S. Morgan, Paul A. Price, John L. Tonry, Richard J. Wainscoat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 (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 and , respectively, and corresponding M31-centric distances of 275 ± 7 kpc and . The brightest of recent Local Group member discoveries, these two new dwarf galaxies owe their late discovery to their large sizes ( arcmin or for Lac I; 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. © 2013. The American Astronomical Society. All rights reserved..

Original languageEnglish
Article number15
Number of pages6
JournalAstrophysical Journal
Volume772
Issue number1
DOIs
Publication statusPublished - 20 Jul 2013

Keywords

  • galaxies: individual (Andromeda XXXI, Andromeda XXXII, Cassiopeia III, Lacerta I)
  • Local Group

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