SIMBAD references

2011A&A...527L...2C - Astronomy and Astrophysics, volume 527, L2-2 (2011/3-1)

An optical spectroscopic survey of the 3CR sample of radio galaxies with z < 0.3. IV. Discovery of the new spectroscopic class of relic radio galaxies.

CAPETTI A., BUTTIGLIONE S., AXON D.J., ROBINSON A., CELOTTI A., BALDI R.D., CHIABERGE M., MACCHETTO F.D. and SPARKS W.B.

Abstract (from CDS):

From an optical spectroscopic survey of 3CR radio galaxies with z<0.3, we discovered a new spectroscopic class of powerful radio-loud AGN. The defining characteristics of these galaxies are that compared with radio galaxies of similar radio luminosity they have: a [OIII]/Hβ ratio of ∼0.5, indicative of an extremely low level of gas excitation; a large deficit of [OIII] emission; and radio core power. We interpret these objects as relic AGN, i.e. sources that experienced a large drop in their level of nuclear activity, causing a decrease in their nuclear and line luminosity. This class opens a novel approach to investigating lifetimes and duty cycles of AGN.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: jets - galaxies: elliptical and lenticular, cD

Simbad objects: 8

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