The Morphological Type Dependence of K-band Luminosity Functions

Details The Morphological Type Dependence of K-band Luminosity Functions The Morphological Type Dependence of K-band Luminosity Functions

2009-02-04

arxiv.org/abs/0902.0778v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

To be published in Galaxy Evolution: Emerging Insights and Future Challenges, ed. S. Jogee et al. Astron. Soc. Pacific 2009. T

Scientific paper

Differential 2.2um (K-band) luminosity functions are presented for a complete sample of 1570 nearby Vgsr < 3000 km/s, where Vgsr is the velocity measured with respect to the Galactic standard of rest), bright (K < 10 mag), galaxies segregated by visible morphology. The K-band luminosity function for late-type spirals follows a power law that rises towards low luminosities whereas the K-band luminosity functions for ellipticals, lenticulars and bulge-dominated spirals are peaked with a fall off at both high and low luminosities. However, each morphological type (E, S0, S0/a-Sab, Sb-Sbc, Sc-Scd) contributes approximately equally to the overall K-band luminosity density in the local universe, and by inference, the stellar mass density as well.

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