Correlation between X-Ray and Radio Absorption in Compact Radio Galaxies

  • Ostorero L
  • Morganti R
  • Diaferio A
  • et al.
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Abstract

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 ( ) and neutral ( ) 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 and display a significant positive correlation with  ∝  b , where b  = 0.47 and b  = 0.35, depending on the subsample. The – 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, .

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APA

Ostorero, L., Morganti, R., Diaferio, A., Siemiginowska, A., Stawarz, Ł., Moderski, R., & Labiano, A. (2017). Correlation between X-Ray and Radio Absorption in Compact Radio Galaxies. The Astrophysical Journal, 849(1), 34. https://doi.org/10.3847/1538-4357/aa8ef6

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