Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-07-27
Astronomy and Astrophysics
Astrophysics
21 pages, 9 figures + 19 additional images (jpg). Accepted for publication in the Astronomical Journal (Nov 2000 issue)
Scientific paper
10.1086/316825
We present near-infrared J and K band imaging of a sample of powerful radio source host galaxies with the Hubble Space Telescope NICMOS2 camera. These sources have been selected on their double lobed radio structure, and include a wide range of projected radio source sizes. The largest projected linear sizes range from the compact Gigahertz Peaked Spectrum (GPS, <1 kpc) and Compact Steep Spectrum (CSS, < 20 kpc) radio sources, up to the large-scale (> 20 kpc) classical doubles (FR II radio sources). We investigate the dependence of host galaxy properties (including near-IR surface brightness profiles) on radio source size, using both our own and published data. The absolute magnitudes and surface brightness profiles are consistent with the host galaxies being regular giant elliptical galaxies rather than Brightest Cluster Galaxies (BCGs). We find that the GPS, CSS, and FR II host galaxies are a uniform class of objects, consistent with a scenario in which a powerful radio source evolves along this size sequence.
Barthel Peter D.
de Vries Willem H.
Fanti Carla
Fanti Roberto
Lehnert Matt D.
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