The effect of local galaxy density on the production of powerful radio sources by early-type galaxies

Details The effect of local galaxy density on the production of powerful radio sources by early-type galaxies The effect of local galaxy density on the production of powerful radio sources by early-type galaxies

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288..122h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 288, Jan. 1, 1985, p. 122-131.

Astronomy and Astrophysics

Astrophysics

51

Astronomical Photography, Extragalactic Radio Sources, Galactic Clusters, Galactic Radiation, Astronomical Catalogs, Charge Coupled Devices, Data Sampling, Density Distribution, Galactic Structure

Scientific paper

The authors have quantitatively analyzed the POSS prints and a set of CCD images obtained at KPNO in order to investigate the local galaxy density around samples of 47 radio-loud and 46 radio-quiet elliptical and lenticular galaxies. The radio sources studied are dominated by steep-spectrum components, not by compact, flat-spectrum ones. The local galaxy density has been measured by weighting the companion galaxies according to their relative size (or luminosity) and/or projected proximity. The primary conclusion is that all measures of average local galaxy density (applied to both the large POSS data set and smaller CCD data set) are larger (by at least a factor of 2 - 3) for the radio-loud galaxies. The statistical significance levels of these results are very high (typically >99.9%). It is argued that the evidence that galaxy interactions foster nuclear activity is now strong and may apply to the whole "zoo" of active extragalactic objects (nuclear starburst galaxies, Seyfert galaxies, Liners, radio galaxies, quasars).

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