Where are Compton-thick radio galaxies? A hard X-ray view of three candidates
Abstract
We present a broad-band X-ray spectral analysis of the radio-loud active galactic nuclei NGC 612, 4C 73.08 and 3C 452, exploiting archival data from NuSTAR, XMM-Newton, Swift and INTEGRAL. These Compton-thick candidates are the most absorbed sources among the hard X-ray selected radio galaxies studied in Panessa et al. We find an X-ray absorbing column density in every case below 1.5 × 1024 cm-2, and no evidence for a strong reflection continuum or iron K α line. Therefore, none of these sources is properly Compton-thick. We review other Compton-thick radio galaxies reported in the literature, arguing that we currently lack strong evidences for heavily absorbed radio-loud AGNs.
- Publication:
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Monthly Notices of the Royal Astronomical Society
- Pub Date:
- March 2018
- DOI:
- arXiv:
- arXiv:1712.01300
- Bibcode:
- 2018MNRAS.474.5684U
- Keywords:
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- galaxies: active;
- galaxies: Seyfert;
- X-rays: galaxies;
- X-rays: individual: NGC 612;
- 4C 73.08;
- 3C 452;
- Astrophysics - High Energy Astrophysical Phenomena;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- Accepted for publication in MNRAS, 10 pages, 5 figures
