The Rosat X-Ray Spectra of BL Lacertae Objects
The Rosat X-Ray Spectra of BL Lacertae Objects
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DOI：
10.1017/s0074180900080761
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发表时间：
1996-01
影响因子：
4.8
通讯作者：
P. Padovani;P. Giommi
中科院分区：
文献类型：
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作者：
P. Padovani;P. Giommi
我们分析了 ROSAT 观察到的所有 BL Lacs（作为指向的或偶然的源）的 X 射线光谱。光谱指数是根据 WGA 目录 [5] 中给出的硬度比获得的，WGA 目录是根据所有 ROSAT PSPC 定向观测生成的大量 X 射线源。对象的选择是通过将 WGA 目录的第一版与我们最近的 BL Lacs 目录（[3]）交叉关联来完成的。结果对 85 个不同的 BL Lacs 进行了 163 次观察，相当于目前已知的已确认的 BL Lacs 的大约一半。这代表了可获得均匀 X 射线光谱信息的最大数量的 BL Lac，也是有史以来在 X 射线频率下研究的最大的 BL Lac 样本。
We have analyzed the X-ray spectra of all BL Lacs observed (as pointed or serendipitous sources) by ROSAT. Spectral indices were obtained from the hardness ratios given in the WGA catalogue [5], a large list of X-ray sources generated from all the ROSAT PSPC pointed observations. The selection of the objects was done by cross-correlating the first revision of the WGA catalogue with our recent catalogue of BL Lacs ([3]). This resulted in 163 observations of 85 distinct BL Lacs, which correspond to about half the confirmed BL Lacs presently known. This represents the largest number of BL Lacs for which homogeneous X-ray spectral information is available and the largest BL Lac sample ever studied at X-ray frequencies.