SIMBAD references

2017ApJ...849...34O - Astrophys. J., 849, 34-34 (2017/November-8)

Correlation between X-ray and radio absorption in compact radio galaxies.

OSTORERO L., MORGANTI R., DIAFERIO A., SIEMIGINOWSKA A., STAWARZ L., MODERSKI R. and LABIANO A.

Abstract (from CDS):

Compact radio galaxies with a GHz-peaked spectrum (GPS) and/or compact-symmetric-object (CSO) morphology (GPS/CSOs) are increasingly detected in the X-ray domain. Their radio and X-ray emissions are affected by significant absorption. However, the locations of the X-ray and radio absorbers are still debated. We investigated the relationship between the column densities of the total (NH) and neutral (NHI) hydrogen to statistically constrain the picture. We compiled a sample of GPS/CSOs including both literature data and new radio data that we acquired with the Westerbork Synthesis Radio Telescope for sources whose X-ray emission was either established or under investigation. In this sample, we compared the X-ray and radio hydrogen column densities, and found that NH and NHI display a significant positive correlation with NHI ∝ NHb, where b = 0.47 and b = 0.35, depending on the subsample. The NH-NHI correlation suggests that the X-ray and radio absorbers are either co-spatial or different components of a continuous structure. The correlation displays a large intrinsic spread that we suggest to originate from fluctuations, around a mean value, of the ratio between the spin temperature and the covering factor of the radio absorber, Ts/Cf.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: active - galaxies: ISM - galaxies: jets - radio lines: galaxies - radio lines: ISM - X-rays: galaxies - X-rays: galaxies

Simbad objects: 30

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2019.09.17-09:36:48

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