Do BL Lac Objects and FR I radiogalaxies inhabit the same galaxy environment
2019
We investigate the environments of galaxies around BL Lac objects and FR I radiogalaxies, the alleged parent populations of misaligned sources. We compare the environment of a sample of 50 BL Lac objects at 0.1i-band. We find that the galaxy excess density within 0.5 Mpc around of FR I radiogalaxies is a factor ~ 2 larger than that around BL Lacs. This implies a reconsideration of the parent population of BL Lac objects.
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