Classification and Statistical Properties of Radio Galaxies with Extended Morphology at z<0.3

Details Classification and Statistical Properties of Radio Galaxies with Extended Morphology at z<0.3 Classification and Statistical Properties of Radio Galaxies with Extended Morphology at z<0.3

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21723005l&link_type=abstract

American Astronomical Society, AAS Meeting #217, #230.05; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Extended radio galaxies (RGs) have traditionally been classified into Fanaroff-Riley (FR) I/II types, based on the ratio r of the separation between the brightest regions on either sides of the host galaxy and the total size of the radio source. We examine the distribution of various physical properties as a function of r of 1040 extended RGs at z<0.3. About 2/3 of the RGs are lobe dominated (LD) and 1/3 have prominent jets. If we follow the original definition of the FR types, i.e., a division based solely on r, FR I/II RGs overlap in their host properties. However, the rare, LD sources with r>0.8 and [OIII]5007 luminosity>106 Lsun are markedly different on average from the rest of the RGs, for they are hosted in lower mass galaxies, live in relatively sparse environments, and likely have higher accretion rates onto the supermassive black hole (SMBH). Thus, these high emission line luminosity, high-r LD RGs, and the rest of RGs form a well-defined dichotomy. Motivated by the stark differences in the nuclear emission line properties of the RG subsamples, we suggest that the accretion rate onto the SMBH may play the primary role in creating the different morphologies. At relatively high accretion rates, the accretion system may produce powerful jets that create the "classical double" morphology (roughly the LD sources with r>0.8 and emission lines); at lower accretion rates, the jets from a radiatively inefficient accretion flow generate radio lobes without apparent "hotspots" at the edge (corresponding to the majority of LD sources). At slightly lower accretion rates and in galaxies with dense galactic structure, sources with prominent jets result. It is possible that while the high accretion rate systems could affect sub-Mpc scale environments, the jets from lower accretion rate systems may efficiently suppress activity within the host galaxies.

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