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Perseus I : a distant satellite dwarf galaxy of Andromeda.

Martin, N.F. and Schlafly, E.F. and Slater, C.T. and Bernard, E.J. and Rix, H.-W. and Bell, E.F. and Ferguson, A.M.N. and Finkbeiner, D.P. and Laevens, B.P.M. and Burgett, W.S. and Chambers, K.C. and Draper, P.W. and Hodapp, K.W. and Kaiser, N. and Kudritzki, R.-P. and Magnier, E.A. and Metcalfe, N. and Morgan, J.S. and Price, P.A. and Tonry, J.L. and Wainscoat, R.J. and Waters, C. (2013) 'Perseus I : a distant satellite dwarf galaxy of Andromeda.', Astrophysical journal letters., 779 (1). L10.


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 3π survey. Located 27fdg9 away from M31, Perseus I has a heliocentric distance of 785 ± 65 kpc, compatible with it being a satellite of M31 at $374^{+14}_{-10}{\rm \,kpc}$ from its host. The properties of Perseus I are typical for a reasonably bright dwarf galaxy (MV = –10.3 ± 0.7), with an exponential half-light radius of rh = 1.7 ± 0.4 arcmin or $r_h = 400^{+105}_{-85}{\rm \,pc}$ 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.

Item Type:Article
Keywords:Galaxies: individual (Perseus I, Andromeda XXXIII), Local Group.
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Publisher statement:© 2013. The American Astronomical Society. All rights reserved.
Record Created:27 Jun 2014 11:50
Last Modified:07 Aug 2014 14:34

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