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arXiv 0902.0778astro-ph.CO
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K带光度函数的形态类型依赖性

The Morphological Type Dependence of K-band Luminosity Functions

Nick Devereux, Paul Hriljac, S. P. Willner, M. L. N. Ashby, C. N. A. Willmer

摘要:

差分2.2 μ m(K波段)光度函数给出了1570个附近Vgsr < 3000 km/s的完整样本,其中Vgsr是相对于银河系静止标准测量的速度,明亮(K < 10等),由可见形态分离的星系。晚型螺旋的K-波段光度函数遵循幂律,在低光度时上升,而椭圆星系、椭圆星系和膨胀主导的螺旋的K-波段光度函数在高光度和低光度时都达到峰值并下降。然而,每一种形态类型(E、S 0、S 0/a-Sab、Sb-Sbc、Sc-Scd)对局部宇宙中K波段光度密度的贡献大致相等,由此推断,对恒星质量密度的贡献也大致相等。

英文摘要:

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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