The Luminosity Distribution of Local Group Galaxies

Details The Luminosity Distribution of Local Group Galaxies The Luminosity Distribution of Local Group Galaxies

1999-04-19

arxiv.org/abs/astro-ph/9904250v2

Astronomy and Astrophysics

Astrophysics

13 pages, 2 figures, accepted for publication in The Astronomical Journal. Figure 2 replaced, conclusion based on this figure

Scientific paper

10.1086/300977

From a rediscussion of Local Group membership, and of distances to individual galaxies, we obtain $M_V$ values for 35 probable and possible Local Group members. The luminosity function of these objects is well fitted by a Schechter function with faint end slope $\alpha = -1.1 \pm 0.1$. The probability that the luminosity distribution of the Local Group is a single Schechter function with $\alpha$ steeper than -1.3 is less than 1 per cent. However, more complicated luminosity functions, such as multi-component Schechter functions with steep faint-end slopes, cannot be ruled out. There is some evidence that the luminosity distribution of dwarf spheroidal galaxies in the Local Group is steeper than that of dwarf irregular galaxies.

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