BL Lac天体IV的ESO VLT光谱。完整样品的新光谱和性质
ESO VLT Optical Spectroscopy of BL Lac Objects IV. New spectra and properties of the full sample
摘要:
我们提出的光谱程序的最后一章,旨在推导红移或下限的BL紫胶天体使用中等分辨率光谱的红移。在这里,我们报告了2008-2009年获得的33个BL Lac天体候选者的新光谱,确认了25个源的BL Lac性质,并为5个天体获得了新的红移。这些新的观测结果与我们以前的数据相结合,以构建一个均匀的样品\sim 70 BL Lacs与高质量的光谱。所有这些光谱都可以在网站http://www.oapd.inaf.it/zbllac/上获得。平均光谱,光束性能的完整样本,讨论干预系统和未来的前景。
英文摘要:
We present the last chapter of a spectroscopy program aimed at deriving the redshift or a lower limit to the redshift of BL Lac objects using medium resolution spectroscopy. Here we report new spectra for 33 BL Lac object candidates obtained in 2008-2009 confirming the BL Lac nature of 25 sources and for 5 objects we obtained new redshifts. These new observations are combined with our previous data in order to construct a homogeneous sample of \sim 70 BL Lacs with high quality spectroscopy. All these spectra can be accessed at the website http://www.oapd.inaf.it/zbllac/. The average spectrum, beaming properties of the full sample, discussion on intervening systems and future perspectives are addressed.
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