Colors of Luminous Bulges in Cluster MS1054-03 and Field Galaxies at Redshifts z ~ 0.83

Details Colors of Luminous Bulges in Cluster MS1054-03 and Field Galaxies at Redshifts z ~ 0.83 Colors of Luminous Bulges in Cluster MS1054-03 and Field Galaxies at Redshifts z ~ 0.83

2005-10-21

arxiv.org/abs/astro-ph/0510657v3

Astrophys.J.634:L5-L8,2005

Astronomy and Astrophysics

Astrophysics

5 pages and 1 figure. Accepted for publication in ApJ Letters

Scientific paper

10.1086/498707

Using HST images, we separate the bulge-like (pbulge) and disk-like (pdisk) components of 71 galaxies in the rich cluster MS1054-03 and of 21 in the field. Our key finding is that luminous pbulges are very red with restframe U-B ~ 0.45, while predicted colors are bluer by 0.20 mag. Moreover, these very red colors appear to be independent of environment, pbulge luminosity, pdisk color, and pbulge fraction. These results challenge any models of hierarchical galaxy formation that predict the colors of distant (z ~ 0.8) luminous field and cluster bulges would differ. Our findings also disagree with other claims that 30% to 50% of bright bulges and ellipticals at z ~ 1 are very blue (U-B < 0).

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