Host galaxies and the unification of radio-loud AGN |
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| Affiliation: | 1. Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA;2. Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy;3. George Mason University, 4400 Fairfax Drive, Fairfax, VA 20124, USA;4. Universita’ dell’Insubria, via Lucini 3, 22100 Como, Italy;1. Tuorla Observatory, University of Turku, Väisäläntie 20, FI-21500 Piikkiö, Finland;2. INAF, Osservatorio Astronomico di Padova, Vicolo dell’ Osservatorio 5, I-35122 Padova, Italy;3. Universita dell’ Insubria, Via Valleggio 11, I-22100 Como, Italy;4. INAF, IASF-CNR Milano, Via E. Bassini 15, I-20133 Milano, Italy;1. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA;2. Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK;2. Astronomisches Institut Münster, Wilhelm-Klemm-Straße 10, D-48149 Münster, Germany |
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| Abstract: | Our HST WFPC2 survey of 110 BL Lac objects, from six complete X-ray-, radio-, and optically-selected catalogs, probes the host galaxies of low-luminosity radio sources in the redshift range 0<z<1.35. The host galaxies are luminous ellipticals, well matched in radio power and galaxy magnitude to FR I radio galaxies. Similarly, the host galaxies of high luminosity quasars occupy the same region of this plane as FR II radio galaxies (matched in redshift). This strongly supports the unification of radio-loud AGN, and suggests that studying blazars at high redshift is a proxy for investigating less luminous (to us) but intrinsically identical radio galaxies, which are harder to find at high z. Accordingly, the difference between low-power jets in BL Lac objects and high-power jets in quasars can then be related to the FR I/FR II dichotomy; and the evolution of blazar host galaxies or their nuclei (jets) should correspond to the evolution of radio galaxies. |
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