Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 727, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/727/1/L6
Keywords
galaxies: fundamental parameters; galaxies: general; galaxies: structure
Categories
Funding
- ASI [I/016/07/0]
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We report on the discovery of a relation between the stellar mass M* of early-type galaxies (hereafter ETGs), their shape, as parameterized by the Sersic index n, and their stellar mass-to-light ratio M*/L. In a three-dimensional log space defined by these variables, the ETGs populate a plane surface with small scatter. This relation tells us that galaxy shape and stellar population are not independent physical variables, a result that must be accounted for by theories of galaxy formation and evolution.
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