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The column density distribution of hard X-ray radio galaxies
- Publication Year :
- 2016
- Publisher :
- arXiv, 2016.
-
Abstract
- In order to investigate the role of absorption in AGN with jets, we have studied the column density distribution of a hard X-ray selected sample of radio galaxies, derived from the INTEGRAL/IBIS and Swift/BAT AGN catalogues (~7-10% of the total AGN population). The 64 radio galaxies have a typical FRII radio morphology and are characterized by high 20-100 keV luminosities (from 10^42 to 10^46 erg/s) and high Eddington ratios (Log L_{Bol}/L_{Edd} typically larger than ~0.01). The observed fraction of absorbed AGN (N_{H} > 10^{22} cm^{-2}) is around 40% among the total sample, and ~75% among type 2 AGN. The majority of obscured AGN are narrow line objects, while unobscured AGN are broad line objects, obeying to the zeroth-order predictions of unified models. A significant anti-correlation between the radio core dominance parameter and the X-ray column density is found. The observed fraction of Compton thick AGN is ~2-3%, in comparison with the 5-7% found in radio-quiet hard X-ray selected AGN. We have estimated the absorption and Compton thick fractions in a hard X-ray sample containing both radio galaxies and non-radio galaxies and therefore affected by the same selection biases. No statistical significant difference was found in the absorption properties of radio galaxies and non radio galaxies sample. In particular, the Compton thick objects are likely missing in both samples and the fraction of obscured radio galaxies appears to decrease with luminosity as observed in hard X-ray non-radio galaxies.<br />15 pages, 10 figures. Accepted 2016 June 14 on MNRAS
- Subjects :
- Seyfert [Galaxies]
Galaxies: Seyfert
active [Galaxies]
Radio galaxy
Astrophysics::High Energy Astrophysical Phenomena
Population
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Type (model theory)
Galaxies: jet
Disc galaxy
jet [Galaxies]
01 natural sciences
Radio continuum: galaxie
Luminosity
0103 physical sciences
education
galaxie [Radio continuum]
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Line (formation)
astro-ph.HE
Physics
Luminous infrared galaxy
High Energy Astrophysical Phenomena (astro-ph.HE)
education.field_of_study
010308 nuclear & particles physics
Astronomy
Astronomy and Astrophysics
Galaxies: active
Astronomy and Astrophysic
Galaxy
Space and Planetary Science
Astrophysics - High Energy Astrophysical Phenomena
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....99d83e2c5ea3f7a518901bccc5a4ea24
- Full Text :
- https://doi.org/10.48550/arxiv.1606.05504