JHK observations of quasars and BL Lac objects
JHK observations of quasars and BL Lac objects
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DOI：
10.1093/mnras/194.4.795
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发表时间：
1981-04
影响因子：
4.8
通讯作者：
I. Glass
中科院分区：
文献类型：
--
作者：
I. Glass
本文报道了40个类星体和7个BL Lac天体的红外测光结果。在某些情况下，观察持续数年。在3σ上限K = 14.5时，另外12个类星体没有被探测到。不变类星体的颜色作为红移的函数，可以用不同带通中谱线和连续谱的存在与否来理解。它表明，剧烈变化的类星体的颜色指示的幂律通量分布，它们大多是高光度，它们作出了重大贡献的散射存在于红外哈勃图。一些BL Lac天体的颜色清楚地揭示了底层星系的存在。
Infrared photometry of 40 QSOs and seven BL Lac objects is presented. In some cases the observations extend over several years. Twelve additional QSOs were not detected at a 3σupper limit ofK= 14.5. The colours of non-variable QSOs as a function of redshift can be understood in terms of the presence or absence of spectral lines and continua in the various bandpasses. It is shown that the violently variable QSOs have colours indicative of a power law flux distribution, that they are mostly of high luminosity and that they make a major contribution to the scatter present in the infrared Hubble diagram. Some BL Lac objects have colours which clearly reveal the presence of underlying galaxies.