Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-23
Astron.Astrophys. 396 (2002) 857-866
Astronomy and Astrophysics
Astrophysics
Accepted for publication in A&A, 10 pages, 12 figures
Scientific paper
10.1051/0004-6361:20021462
Almost 60% of the B2 low luminosity radio galaxies have been observed with the Hubble Space Telescope. We present an analysis of the dust features, which are often present in the form of circum-nuclear disks or lanes, and show that there are correlations between radio source and dust properties. It is found that nearby radio sources in which a jet has been detected tend to have dust more often than sources without jets; the dust is often in the form of disks or lanes. Moreover the radio jets are close to perpendicular to the disk or lane in the weaker radio sources (with P < 10^{24} W/Hz). In stronger sources the orientation effect appears to be weak or even absent. Also the dust masses found in the weaker radio sources are smaller than in the stronger ones (log M/M_sun ~ 3 against 5 respectively). More generally it appears that there is a correlation between dust mass and total radio power (for those sources in which dust has been detected); we show that this correlation is not induced by redshift.
Capetti Alessandro
de Ruiter Hans R.
Fanti Roberto
Morganti Rafaella
Parma Paola
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