Perseus I: A distant satellite dwarf galaxy of Andromeda
Abstract
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 3{\pi} survey. Located 27.9{\deg} 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 (M_V = -10.3 +/- 0.7), with an exponential half-light radius of r_h = 1.7 +/- 0.4 arcminutes 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.
Keywords
Cite
@article{arxiv.1310.4170,
title = {Perseus I: A distant satellite dwarf galaxy of Andromeda},
author = {Nicolas F. Martin and Edward F. Schlafly and Colin T. Slater and Edouard J. Bernard and Hans-Walter Rix and Eric F. Bell and Annette M. N. Ferguson and Douglas P. Finkbeiner and Benjamin P. M. Laevens and William S. Burgett and Kenneth C. Chambers and Peter W. Draper and Klaus W. Hodapp and Nicholas Kaiser and Rolf-Peter Kudritzki and Eugene A. Magnier and Nigel Metcalfe and Jeffrey S. Morgan and Paul A. Price and John L. Tonry and Richard J. Wainscoat and Christopher Waters},
journal= {arXiv preprint arXiv:1310.4170},
year = {2015}
}
Comments
6 pages, 4 figures. Accepted for publication in ApJL