首页 | 本学科首页   官方微博 | 高级检索  
     检索      


The space density of low-redshift active galactic nuclei
Authors:D Londish  B J Boyle  D J Schade
Institution:School of Physics, University of New South Wales, Kensington, NSW 2030, Australia;Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia;Dominion Astrophysical Observatory, 5071 West Saanich Road, Victoria V8X 4M6, Canada
Abstract:We present a new determination of the optical luminosity function (OLF) of active galactic nuclei (AGN) at low redshifts ( z <0.15) based on Hubble Space Telescope ( HST ) observations of X-ray-selected AGN. The HST observations have allowed us to derive a true nuclear luminosity function for these AGN. The resulting OLF illustrates a two power-law form similar to that derived for quasi‐stellar objects (QSOs) at higher redshifts. At bright magnitudes, M B B >?20. Although the estimate of the OLF is best fitted by a power-law slope at M B 0.35, the binned estimate of the low-redshift OLF is still consistent with an extrapolation of the z >0.35 OLF based on pure luminosity evolution.
Keywords:galaxies: active  galaxies: luminosity function  mass function  quasars: general
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号