Abstract
The close proximity of a radio-loud active galactic nucleus (AGN) can trigger star formation in nearby objects containing gas if they are hit by a radio jet emerging from the active nucleus (as is observed, for example, in the case of Minkowski’s Object). The predicted frequency of such events is modest for close pairs of galaxies—of the order of several percent of all close (with separations of the order of several tens of parsec) pairs containing a radio AGN. A statistical study of this effect is carried out using the SDSS and FIRST surveys, by searching for spatially close pairs (projected separations <150 kpc, relative radial velocities <600 km/s) containing AGNs with radio jets. The frequency of galaxies with bursts of star formation, f SF, and active nuclei f AGN, in pairs either containing or not containing an AGN with radio jets are evaluated as functions of the separation of the galaxies in the pair. It is concluded that (1) the predicted effect should be of the order of 5%, falling off with increasing separation between the galaxies in the pair; (2) the observed values of f SF and f AGN and their dependences on the galaxy separation are consistent withmodel predictions, but the large uncertainties associated with the limited size of the studied sample hinders firm conclusions about the existence of radio-induced activity in close galaxy pairs; (3) further investigations using a larger volume of observational material are required, for example, using only photometric redshifts.
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Original Russian Text © I.N. Pashchenko, V.M. Vitrishchak, 2010, published in Astronomicheskiĭ Zhurnal, 2010, Vol. 87, No. 2, pp. 115–131.
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Pashchenko, I.N., Vitrishchak, V.M. Radio-induced activity in galaxy pairs. Astron. Rep. 54, 97–111 (2010). https://doi.org/10.1134/S1063772910020010
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DOI: https://doi.org/10.1134/S1063772910020010