HST Observations of BL Lacertae Environments

Details HST Observations of BL Lacertae Environments HST Observations of BL Lacertae Environments

1999-08-31

arxiv.org/abs/astro-ph/9908344v1

New Astron.Rev. 46 (2002) 159-162

Astronomy and Astrophysics

Astrophysics

to appear in "life cycles of radio galaxies", Ed. J.Biretta et al., New Astronomy Reviews, 4 pages + 1 figure

Scientific paper

10.1016/S1387-6473(01)00172-5

We analyze images of BL Lacertae objects obtained with the {\it Hubble Space Telescope} WFPC2 and the F814W filter. The nine objects cover a redshift range of 0.19 to 0.997. The relatively deep images are sufficient to detect galaxies at least one magnitude below M$^{*}_{I}$ (--21.4) and in most cases to three magnitudes below M$^{*}$. Galaxy enhancement over the average background is found around four out of the nine objects. Results for some cases are confirmed by ground-based imaging. In the other cases, the redshifts of the target BL Lac objects may be incorrect or they are truly isolated. These findings reinforce the idea that on average, BL Lac objects are found in regions of above average galaxy density. However, isolated objects apparently can host BL Lac nuclei too, a result that has implications for the processes that trigger/fuel the nuclear activity.

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