Imaging the Host Galaxies of BL Lac Objects

Details Imaging the Host Galaxies of BL Lac Objects Imaging the Host Galaxies of BL Lac Objects

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.0306w&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #03.06; Bulletin of the American Astronomical Society, Vol. 24, p.731

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We have made two-color optical observations of the host galaxies of BL Lac objects using the Canada-France-Hawaii Telescope (CFHT). We observed a complete sample of 21 x-ray selected BL Lac objects (XBLs) of known redshift taken from the EMSS catalog, as well as a comparison sample of 30 radio-selected BL Lacs (RBLs) of known redshift drawn from the literature. We have resolved hosts galaxies of BL Lacs out to z=0.638. Based on the mu = 25 isophote of resolved hosts, we can derive a total luminosity for a de Vaucouleurs profile elliptical galaxy. The typical range for all our objects (XBLs and RBLs) is -25 < Mtot < -23 (q0=0, H0=50), similar to FR1 radio hosts. Using either an elliptical (de Vaucouleurs) or spiral (exponential {+} elliptical bulge) profile for the host, plus a central point source, we have performed fits to the isophotal profiles. Most BL Lac hosts are well-fit by a de Vaucouleurs r(1/4) law plus point source. Using two different methods, we have examined the images for decentering of the point source from the host. The primary method is to plot the isophote centroid vs major axis. The second method attempts to remove the point source before finding the centroids of the host's isophotes. In two cases we have discovered de-centered point sources strongly suggesting that these BL Lacs are background to the observed galaxies. Additionally, we have identified several objects with features which are not the same color as the underlying resolved hosts. These may be evidence for optical jets similar to PKS0521-36.

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