A Subset of Quasars Brighter than the Others

摘要：

We have calculated the Doppler redshifts for a sample of quasars from their observed emission and absorption redshifts. In our sample, we selected only those absorption redshifts that are larger than the corresponding emission redshifts. We obtained 256 absorption systems with Ζabs > Ζem from 123 quasars. We find that there is a two-peaked structure in the distribution of the Doppler redshifts, with one peak being located at ΖDopp ≈ 0.00 and the other at ΖDopp ≈ 0.01 Around the second peak, ΖDopp ≈ 0.01, we identify a subset of quasars with Doppler redshifts greater than 0.0088. Our analysis shows that quasars in this subset are generally brighter than those with Doppler redshifts less than 0.0088. The Doppler velocities of the absorbers of these quasars are concentrated about ～ 3000 km s-l.

关键词： methods statistical quasars general quasars emission lines quasars absorption lines

作者: L. Z. Lü Y. P. Qin A. C. Gupta

作者单位: Physics Department, Guangxi UniversitV, Nanning 530004, P. R. China Center for Astrophysics, Guangzhou University, Guangzhou 510006, P. R. China Aryabhatta Research Institute for Observational Sciences (ARIES), Manora Peak, Naini Tal 263129, IND

会议类型: 国际会议

会议名称: The 10th Asian-Pacific Regional International Astronomical Union Meeting(第十届亚洲及太平洋地区天文学大会 APRIM)

会议地点: 昆明

会议语种:英文

页码: 326-327

在线出版日期: 2008-08-03（万方平台首次上网日期，不代表论文的发表时间）