Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 779, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/779/1/L10
Keywords
galaxies: individual (Perseus I, Andromeda XXXIII); Local Group
Categories
Funding
- National Aeronautics and Space Administration [NNX08AR22G]
- National Science Foundation [AST-1238877]
- University of Maryland
- Eotvos Lorand University (ELTE)
- STFC [ST/J001422/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J001422/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1008342, 1009749] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1238877] Funding Source: National Science Foundation
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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 3p survey. Located 27 +/- 9 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 (MV = -10.3 +/- 0.7), with an exponential halflight radius of r(h) = 1.7 +/- 0.4 arcmin or rh = 400+ 105 -85 pc at this distance, and a moderate ellipticity (mu = 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.
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