J/other/Ap/66.11 Optical classification of BZG objects (Abrahamyan+, 2023)
Optical classification of BZG objects from the BZCAT blazar catalog.
Abrahamyan H.V., Mickaelian A.M., Paronyan G.M., Mikayelyan G.A.,
Sukiasyan A.G.
<Astrophysics , 66, 11-23 (2023)>
=2023Ap.....66...11A 2023Ap.....66...11A (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei; QSOs ; Radio sources; Redshifts;
Magnitudes, absolute
Keywords: blazar - quasar - optical spectral classification -
radio spectral index
Abstract:
In the blazar catalog BZCAT the objects are divided into 4 types: BZB,
BZQ, BZG, and BZU. In this paper BZG objects are studied in order to
determine their physical nature. Of the 274 BZG objects, 150 have
optical spectra in the SDSS spectroscopic catalog, for which a
detailed spectral classification has been carried out. A radio study
showed that these objects mostly (69%) have a flat radio spectrum with
a spectral index less than ±0.5. Quasars predominate among these
kinds of radio spectra. However, with increasing distance, on the
average the radio spectrum becomes steeper.
Description:
Table 4 shows our detailed classification of the 150 BZG objects using
the SDSS DR 16 spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 127 150 List of the 150 BZG objects classified
using the SDSS spectra
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See also:
VII/274 : The Roma BZCAT - 5th edition (Massaro+, 2015)
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- BZG Blazar name (5BZG JHHMM+DDMM)
18- 28 F11.7 deg RAdeg Right ascension (J2000), BZCAT v.5
31- 42 F12.7 deg DEdeg Declination (J2000), BZCAT v.5
46- 50 F5.2 mag rmag SDSS r magnitude
53- 58 F6.2 mag rMAG Absolute magnitude (SDSS r band)
61- 67 F7.5 --- z SDSS redshift
70- 74 F5.2 --- RSI ? Radio spectral index
77- 82 A6 --- SDSS SDSS classification
85- 87 A3 --- VCV-13 VCV-13 classification (Veron-Cetty and Veron,
2010A&A...518A..10V 2010A&A...518A..10V, Cat. VII/258)
90-115 A26 --- NED NED classification
118-127 A10 --- NewAT New activity type (DD1,DD2,DD3 and by eye)
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Acknowledgements:
Areg Mickaelian, aregmick(at)yahoo.com
(End) Patricia Vannier [CDS] 31-Mar-2024