HST Snapshot Survey of BL Lac: General Information
The Hubble Space Telescope (HST) snapshot survey of BL Lacs objects is a survey aimed primarily to the study of the BL Lacertae host galaxy and close environment. A total of 109 objects up to redshift 1.2 were observed with the WFPC2 camera.
As a service to the general astronomical community, for each object we made available in this web page some general information, together with the reduced images and the average radial profile.

How To Use This Page
Click on any cell of the table in order to retrive:

"OBJECT NAME": The object name, in IAU style, is linked to the log of the observation.

"PS": clicking here allows you to retrive a small subset of the original HST image in postscript format. The BL Lac object is always at the center of this small image. Note that the orientation is not as for normal astronomical images, for the north direction varies randomly from image to image. To get the precise orientation and scale you should retrive the "Contour" image.

"CONTOUR": This is the same subset image as for the "PS" link. However, this time the image is displayed using isophotes rather than gray scales. This image is also useful because it reports the scale in arcsecs and orientation (the arrow points to the north and east).

"PROFILE": Radial profile obtained averaging over rings of increasing radius all around the object. The object profile (filled squares) is usually decomposed into a point source (dotted line) plus a de Vaucouleur (dashed line) model. The solid line is the sum of the two models.

"FITS": Same image as before but this time in FITS format. This file can be down loaded and then used with an image processing (like IRAF) for a more direct analysis of the image.