期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 327, 期 4, 页码 1249-1259出版社
BLACKWELL SCIENCE LTD
DOI: 10.1046/j.1365-8711.2001.04844.x
关键词
galaxies : fundamental parameters; galaxies : luminosity function, mass function; galaxies : statistics
We measure the z = 0 B-band optical luminosity function (LF) for galaxies selected in a blind Hi survey. The total LF of the Hi selected sample is flat, with Schechter parameters M*= -19.38+(+1.02)(-0.62) + 5 log h(100) mag and alpha = -1.03(-0.15)(+0.25), in good agreement with LFs of optically selected late-type galaxies. Bivariate distribution functions of several galaxy parameters show that the H I density in the local Universe is more widely spread over galaxies of different size, central surface brightness and luminosity than the optical luminosity density is. The number density of very low surface brightness (LSB) (>24.0 mag arcsec (-2)) gas-rich galaxies is considerably lower than that found in optical surveys designed to detect dim galaxies. This suggests that only a part of the population of LSB galaxies is gas-rich and that the rest must be gas-poor. However, we show that this gas-poor population must be cosmologically insignificant in baryon content. The contribution of gas-rich LSB galaxies (>23.0 mag arcsec(-2)) to the local cosmological gas and luminosity density is modest (18(-5)(+6) and 5(-2)(+2) per cent respectively); their contribution to Omega (matter) is not well-determined, but probably <11 per cent. These values are in excellent agreement with the low redshift results from the Hubble Deep Field.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据