Evolutionary behaviour of BL Lac objects

被引：0

作者：

Beckmann, V ^{[1
]}

机构：

[1] Hamburger Sternwarte, D-21029 Hamburg, Germany

来源：

BL LAC PHENOMENON | 1999年 / 159卷

关键词：

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present analysis of a new flux limited sample of 72 X-ray selected BL Lacertae objects with known redshifts for 59 of them. We find the more X-ray dominated BL Lac having negative evolution with redshift, while intermediate objects show no evolution at all. X-ray dominated objects show higher X-ray luminosities and flatter X-ray spectra than the intermediate ones. We were also able to determine the redshift of 1517+656, which is part of our sample and is the optically most luminous X-ray selected BL Lac known so far.

引用

页码：493 / 498

页数：6

共 20 条

[1]

Bade N, 1998, ASTRON ASTROPHYS, V334, P459

[2]

BECKMANN V, 1999, UNPUB A A

[3] THE RECOGNITION OF BL LAC OBJECTS AND THEIR STATISTICAL PROPERTIES [J].