Activity Types of Galaxies Selected from an HRC/BHRC Sample. II

This is a detailed spectral classification of 198 candidate active galactic nuclei (AGN) from a joint HRC/BHRC sample consisting of a combination of the HRC (Hamburg-ROSAT) and BHRC (Byurakan-ROSAT) catalogs. These objects have been identified as optical counterparts of ROSAT x-ray sources, but spectra for 198 of them are given in the SDSS without determinations of their spectral classification. They are studied using the SDSS spectra and detailed types of activity are found for them. For a more reliable classification, three diagnostic diagrams have been used, along with direct studies of the spectra. These sources were also identified in other wavelength ranges and their physical parameters have also been calculated.

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Correspondence to G. M. Paronyan.

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Translated from Astrofizika, Vol. 63, No. 2, pp. 193-205 (May 2020)

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Paronyan, G.M., Mickaelian, A.M., Abrahamyan, H.V. et al. Activity Types of Galaxies Selected from an HRC/BHRC Sample. II. Astrophysics 63, 166–178 (2020). https://doi.org/10.1007/s10511-020-09623-6

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Keywords

  • AGN
  • x-ray emission
  • spectral classification
  • HRC/BHRC
  • x-ray AGN
  • ROSAT
  • HQS