Exploring the spectroscopic properties of relic radiogalaxies

Author: Capetti A.   Robinson A.   Baldi R. D.   Buttiglione S.   Axon D. J.   Celotti A.   Chiaberge M.  

Publisher: Edp Sciences

E-ISSN: 1432-0746|551|issue|A55-A55

ISSN: 0004-6361

Source: Astronomy & Astrophysics, Vol.551, Iss.issue, 2013-02, pp. : A55-A55

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Abstract

From an optical spectroscopic survey of 3CR radiogalaxies (RGs) with z < 0.3, we discovered three objects characterized by an extremely low level of gas excitation and a large deficit of line emission with respect to RGs of similar radio luminosity. We interpreted these objects as relic active galactic nuclei (AGN), i.e., sources observed after a large drop in their nuclear activity.