Faint dwarf spheroidals in the Fornax Cluster: A flat luminosity function

Details Faint dwarf spheroidals in the Fornax Cluster: A flat luminosity function Faint dwarf spheroidals in the Fornax Cluster: A flat luminosity function

2002-12-02

arxiv.org/abs/astro-ph/0212044v1

Astron.Astrophys. 397 (2003) L9-L12

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, accepted for publication in Astronomy & Astrophysics (Letters)

Scientific paper

10.1051/0004-6361:20021766

We have discovered about 70 very faint dwarf galaxies in the Fornax Cluster. These dSphs candidates follow the same magnitude-surface brightness relation as their counterparts in the Local Group, and even extend it to fainter limits. The faintest dSph candidate in our sample has an absolute magnitude of M_V = -8.8 mag and a central surface brightness of mu_V = 27 mag/arcsec^2. There exists a tight color-magnitude relation for the early-type galaxies in Fornax that extends from the giant to the dwarf regime. The faint-end slope of the luminosity function of the early-type dwarfs is flat (alpha = -1.1+/-0.1), contrary to the results obtained by Kambas et al. (2000).

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