SIMBAD references

2014MNRAS.438.1149G - Mon. Not. R. Astron. Soc., 438, 1149-1161 (2014/February-3)

The Wide-field Infrared Survey Explorer properties of complete samples of radio-loud active galactic nucleus.

GURKAN G., HARDCASTLE M.J. and JARVIS M.J.

Abstract (from CDS):

We present an analysis of four complete samples of radio-loud active galactic nucleus (AGN; 3CRR, 2Jy, 6CE and 7CE) using near- and mid-IR data taken by the Wide-field Infrared Survey Explorer (WISE). The combined sample consists of 79 quasars and 273 radio galaxies, and covers a redshift range 0.003 < z < 3.395. The dichotomy in the mid-IR properties of low- and high-excitation radio galaxies (LERGs and HERGs) is analysed for the first time using large complete samples. Our results demonstrate that a division in the accretion modes of LERGs and HERGs clearly stands out in the mid-IR-radio plane (L22µm = 5x1043 erg/s). This means that WISE data can be effectively used to diagnose accretion modes in radio-loud AGN. The mid-IR properties of all objects were analysed to test the unification between quasars and radio galaxies, consistent with earlier work, and we argue that smooth torus models best reproduce the observation. Quasars are found to have higher mid-IR luminosities than radio galaxies. We also studied all the sources in the near-IR to gain insights into evolution of AGN host galaxies. A relation found between the near-IR luminosity and redshift, well known in the near-IR, is apparent in the two near-IR WISE bands, supporting the idea that radio sources are hosted by massive elliptical galaxies that formed their stars at high redshifts and evolved passively thereafter. Evaluation of the positions of the sample objects in WISE colour-colour diagrams shows that widely used WISE colour cuts are not completely reliable in selecting AGN.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): galaxies: active - galaxies: nuclei - infrared: galaxies

VizieR on-line data: <Available at CDS (J/MNRAS/438/1149): 2jy.dat 3crr.dat 6ce.dat 7ce.dat>

Simbad objects: 353

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2014MNRAS.438.1149G and select 'bookmark this link' or equivalent in the popup menu


2019.12.06-15:25:47

© Université de Strasbourg/CNRS

    • Contact