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Date and Time of the Query: 2019-06-15 T20:55:02 PDT
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For refcode 1999ApJ...525L..17T:
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1999ApJ...525L..17T Observational Test of Environmental Effects on the Local Group Dwarf Spheroidal Galaxies Naoyuki Tamura and Hiroyuki Hirashita Department of Astronomy, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan; tamura@kusastro.kyoto-u.ac.jp Received 1999 June 1; accepted 1999 August 31; published 1999 October 5 ABSTRACT In this Letter, we examine whether tidal forces exerted by the Galaxy or M31 have an influence on the Local Group dwarf spheroidal galaxies (dSph's) that are their companions. We focus on the surface brightness profiles of the dSph's, especially their core radii, because it is suggested, based on the numerical simulations, that tidal disturbance can make core radii extended. We examine the correlation for the dSph's between the distances from their parent galaxy (the Galaxy or M31) and the compactnesses of their surface brightness profiles by using a parameter C defined newly in this Letter. Consequently, we find no significant correlation. We make some remarks on the origin of this result by considering three possible scenarios-the tidal picture, the dark matter picture, and the heterogeneity of the group of dSphs-each of which has been often discussed as a way of understanding the fundamental properties and formation processes of dSphs. Subject headings: galaxies: elliptical and lenticular, cD-galaxies: evolution-galaxies: fundamental parameters
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