PERSEUS I: A DISTANT SATELLITE DWARF GALAXY OF ANDROMEDA

Journal Article · Tue Dec 10 00:00:00 EST 2013 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/779/1/L10· OSTI ID:22364092

Martin, Nicolas F.; Laevens, Benjamin P. M. ^[1]; Schlafly, Edward F.; Rix, Hans-Walter ^[2]; Slater, Colin T.; Bell, Eric F. ^[3]; Bernard, Edouard J.; Ferguson, Annette M. N. ^[4]; Finkbeiner, Douglas P. ^[5]; Burgett, William S.; Chambers, Kenneth C.; Hodapp, Klaus W.; Kaiser, Nicholas; Kudritzki, Rolf-Peter; Magnier, Eugene A.; Morgan, Jeffrey S.; Tonry, John L. ^[6]; Draper, Peter W.; Metcalfe, Nigel ^[7]; others, and

---

1. Observatoire astronomique de Strasbourg, Université de Strasbourg, CNRS, UMR 7550, 11 rue de l'Université, F-67000 Strasbourg (France)
2. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg (Germany)
3. Department of Astronomy, University of Michigan, 500 Church St., Ann Arbor, MI 48109 (United States)
4. Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ (United Kingdom)
5. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
6. Institute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822 (United States)
7. Department of Physics, Durham University, South Road, Durham DH1 3LE (United Kingdom)

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 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{sub −10}{sup +14} kpc from its host. The properties of Perseus I are typical for a reasonably bright dwarf galaxy (M{sub V} = –10.3 ± 0.7), with an exponential half-light radius of r{sub h} = 1.7 ± 0.4 arcmin or r{sub h}=400{sub −85}{sup +105} pc at this distance, and a moderate ellipticity (ϵ=0.43{sub −0.17}{sup +0.15}). The late discovery of Perseus I is due to its fairly low surface brightness (μ{sub 0}=25.7{sub −0.9}{sup +1.0} mag arcsec{sup –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.

• OSTI ID: 22364092
• Journal Information: Astrophysical Journal Letters, Vol. 779, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTRONOMY
ASTROPHYSICS
BRIGHTNESS
DISTANCE
GALAXIES
GALAXY CLUSTERS
HYDROGEN 1
LIMITING VALUES
PHOTOMETRY
SATELLITES
SURFACES
VISIBLE RADIATION