The Host Galaxies of BL Lacertae Objects

Details The Host Galaxies of BL Lacertae Objects The Host Galaxies of BL Lacertae Objects

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3657m&link_type=abstract

HST Proposal ID #3657

Physics

Hst Proposal Id #3657

Scientific paper

In the currently popular 'unified schemes' for AGN, BL Lac objects are thought to be ordinary double radio sources seen end-on. As the host galaxies of double radio sources are almost all large elliptical galaxies, we expect that the same will be true of BL Lac objects. We have undertaken a deep CCD imaging survey of BL Lacs with the 4.2m William Herschel Telescope and, although we find many elliptical galaxies, we also find some disc systems. These results are very exciting but are hard to reconcile with standard 'unified schemes'. We have now done as much as we can from the ground. We propose here to extend these observations to confirm the morphology of one of our proposed disc hosts which is an excellent candidate for HST observations as the very red BL Lac core contributes very little to the total visual light from the galaxy. These observations will be a significant advance on ground based work but will not attempt to push the HST beyond its realistic capabilities.

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