Halos around edge-on disk galaxies in the SDSS

Details Halos around edge-on disk galaxies in the SDSS Halos around edge-on disk galaxies in the SDSS

2003-09-23

arxiv.org/abs/astro-ph/0309623v1

Mon.Not.Roy.Astron.Soc.347:556-568,2004

Astronomy and Astrophysics

Astrophysics

15 pages, 9 figures. Accepted for publication on MNRAS. Version with full resolution images available at http://www.mpa-garc

Scientific paper

10.1111/j.1365-2966.2004.07235.x

We present a statistical analysis of halo emission for a sample of 1047 edge-on disk galaxies imaged in five bands by the Sloan Digital Sky Survey (SDSS). Stacking the homogeneously rescaled images of the galaxies, we can measure surface brightnesses as deep as mu_r~31 mag/arcsec^2. The results strongly support the almost ubiquitous presence of stellar halos around disk galaxies, whose spatial distribution is well described by a power-law $\rho\propto r^{-3}$, in a moderately flattened spheroid (c/a~0.6). The colour estimates in g-r and r-i, although uncertain, give a clear indication for extremely red stellar populations, hinting at old ages and/or non-negligible metal enrichment. These results support the idea of halos being assembled via early merging of satellite galaxies.

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