Do BL Lac Objects and FR I radiogalaxies inhabit the same galaxy environment?
High Energy Astrophysical Phenomena
2019-04-10 v1 Astrophysics of Galaxies
Abstract
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 0.1<z<0.33 with that of a sample of 90 FR I galaxies at 0.1<z< 0.15. The galaxy environment is estimated using the SDSS images in the i-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.
Cite
@article{arxiv.1903.01935,
title = {Do BL Lac Objects and FR I radiogalaxies inhabit the same galaxy environment?},
author = {A. Sandrinelli and R. Falomo and A. Treves},
journal= {arXiv preprint arXiv:1903.01935},
year = {2019}
}
Comments
$ pages, 4 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society Letters