Activity Types of Galaxies Selected from HRC/BHRC Sample

In this study we carry out detailed spectral classification of 173 AGN candidates from the Joint HRC/BHRC sample, which is a combination of HRC (Hamburg-ROSAT Catalogue) and BHRC (Byurakan-Hamburg-ROSAT Catalogue). These objects were revealed as optical counterparts for ROSAT X-ray sources; however,...

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Bibliographic Details
Published in:Astrophysics 2019-06, Vol.62 (2), p.147-162
Main Authors: Paronyan, G. M., Mickaelian, A. M., Harutyunyan, G. S., Abrahamyan, H. V., Mikayelyan, G. A.
Format: Article
Language:English
Subjects:
Active galactic nuclei
Astronomy
Astrophysics
Astrophysics and Astroparticles
Astrophysics and Cosmology
Classification
Diagnostic systems
Galaxies
Observations
Observations and Techniques
Optical counterparts (astronomy)
Physics
Physics and Astronomy
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Spectra
Spectral classification
X ray sources
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Summary:In this study we carry out detailed spectral classification of 173 AGN candidates from the Joint HRC/BHRC sample, which is a combination of HRC (Hamburg-ROSAT Catalogue) and BHRC (Byurakan-Hamburg-ROSAT Catalogue). These objects were revealed as optical counterparts for ROSAT X-ray sources; however, spectra for 173 of them are given in SDSS without definite spectral classification. We studied these 173 objects using the SDSS spectra and revealed the detailed activity types for them. Three diagnostic diagrams and direct examination of the spectra were used to obtain a more confident classification. We also identified these sources in other wavelength ranges and calculated some of their parameters.
ISSN:0571-7256
1573-8191
DOI:10.1007/s10511-019-09570-x