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arXiv 0810.3563astro-ph
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BL Lacertae天体的ESO VLT光谱学。III。样本的扩展

ESO VLT optical spectroscopy of BL Lacertae objects. III. An extension of the sample

B. Sbarufatti, S. Ciprini, J. Kotilainen, R. Decarli, A. Treves, A. Veronesi, R. Falomo

摘要:

我们目前的结果正在进行的计划在ESO VLT的光谱学BL紫胶对象缺乏一个坚定的红移估计,在这里,我们报告15个对象。对于11个源,我们确认了BL Lac分类,并且我们确定了3个物体的新红移,1个具有弱发射线(PKS 1057-79,z=0.569)和2个来自宿主星系的天体(RBS 1752,z=0.449; RBS 1915,z=0.243);此外,在BLLac PKS 0823-223(z ≥ 0.911)的方向上检测到亚阻尼莱曼α(sub-DLA)系统。对于剩下的8个BL Lac,由于没有宿主星系的吸收线,我们得到了红移的下限,z_min在0.20-0.80之间。剩下的三个源被重新归类为FSRQ(PKS 1145-676,z=0.210; TXS 2346+052,z=0.419)和错误分类的银河系恒星(PMNJ 1323-3652)。

英文摘要:

We present results of an ongoing program at the ESO VLT for spectroscopy of BL Lac objects lacking a firm redshift estimate and here we report on 15 objects. For 11 sources we confirm the BL Lac classification, and we determine new redshifts for 3 objects, 1 with weak emission lines (PKS 1057-79, z=0.569) and 2 with absorptions from the host galaxy (RBS 1752, z=0.449; RBS 1915, z=0.243); moreover a sub Damped Lyman Alpha (sub-DLA) system is detected in the direction of the BL Lac PKS 0823-223 (z>=0.911). For the remaining 8 BL Lacs, from the very absence of absorption lines of the host galaxy, lower limits to the redshift are deduced with z_min in the interval 0.20-0.80. The remaining three sources are reclassified as a FSRQ (PKS 1145-676, z=0.210; TXS 2346+052, z=0.419) and a misclassified galactic star (PMNJ 1323-3652).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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