Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-11
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures. This paper will be published as part of the Galaxy Evolution Explorer (GALEX) Astrophysical Journal Letter
Scientific paper
10.1086/422470
M32, the compact elliptical-galaxy companion to the Andromeda spiral galaxy has been imaged by the Galaxy Evolution Explorer (GALEX) in two ultraviolet bands, centered at ~1500 (FUV) and 2300 Angstroms (NUV). The imaging data have been carefully decomposed so as to properly account for the complicated background contamination from the disk of M31. We have derived the surface brightness and color profiles finding a slightly positive color gradient of Delta(FUV-B)/Delta log(r)=+0.15+/-0.03 within one effective radius. Earlier data from the Ultraviolet Imaging Telescope suggested that M32 had an extremely large (negative) FUV-optical color gradient (Delta(FUV-B)/Delta log(r)<-2), inverted with respect to the majority of gradients seen in giant elliptical galaxies. Our new results show that, despite of its very low UV-upturn, M32 has similar UV properties to those observed in luminous elliptical galaxies.
Barlow Thomas A.
Bianchi Luciana
Byun Yong-Ik.
Donas Jose
Forster Karl
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