IMAGING REDSHIFT ESTIMATES FOR BL LACERTAE OBJECTS
IMAGING REDSHIFT ESTIMATES FOR BL LACERTAE OBJECTS
复制标题
BL 蜱虫物体的成像红移估计
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. Romani
中科院分区：
文献类型：
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作者：
A. Meisner;R. Romani
为了寻找活动星系核的宿主，从而限制源红移，我们获得了BL Lacertae天体（BL拉克）的高动态范围、高自然视宁度的i′像.这些天体来自明亮的平谱射电源样本，这些射电源要么是已知的（通过最近的费米大面积望远镜观测）伽马射线发射器，要么是可能在持续的伽马射线观测中检测到的类似源。所有这些都有光谱学证实是BL Lac源，但没有红移的解决方案。我们检测到25/49个对象的主机。由于这些星系被认为是标准烛光，我们测量的主机星等提供了红移估计（范围从0.2到1.0）。下限上的红移的非检测建立。拟合红移的平均值（和下限）高于射电和伽马射线强母源样品的光谱解，这表明可能需要对这些源的光度函数和演化进行校正。
We have obtained high dynamic range, good natural seeing i′ images of BL Lacertae objects (BL Lacs) to search for the active galactic nucleus host and thus constrain the source redshift. These objects are drawn from a sample of bright flat-spectrum radio sources that are either known (via recent Fermi Large Area Telescope observations) gamma-ray emitters or similar sources that might be detected in continuing gamma-ray observations. All had spectroscopic confirmation as BL Lac sources, but no redshift solution. We detected hosts for 25/49 objects. As these galaxies have been argued to be standard candles, our measured host magnitudes provide redshift estimates (ranging from 0.2 to 1.0). Lower bounds are established on the redshifts of non-detections. The mean of the fit redshifts (and lower limits) is higher than those of spectroscopic solutions in the radio-loud and gamma-ray-loud parent samples, suggesting corrections may be needed for the luminosity function and evolution of these sources.