J/A+A/682/A174 Classification of Markarian galaxies (Mickaelian+, 2024)
Homogeneous fine classification of Markarian galaxies based on
SDSS medium-resolution spectroscopy.
Mickaelian A.M., Abrahamyan H.V., Mikayelyan G.A., Paronyan G.M.
<Astron. Astrophys. 682, A174 (2024)>
=2024A&A...682A.174M 2024A&A...682A.174M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, Markarian ; Photometry, SDSS ; Redshifts ;
Photometry, classification
Keywords: techniques: spectroscopic - catalogs - surveys - galaxies: active -
galaxies: Seyfert - galaxies: starburst
Abstract:
Markarian (Mrk) galaxies, revealed due to their ultraviolet excess are
very famous; they play a significant role in many astrophysical
problems and come in a variety of types: Seyferts (Sys),
low-ionization narrow emission-line regions (LINERs), starbursts
(SBs), blue compact dwarf galaxies (BCDGs), as well as some quasars
(QSOs) and blazars. They also appear as sources of non-optical
radiation, such as gamma-ray, X-ray, ultraviolet (UV), infrared (IR),
and radio, including some extremely high-energy gamma-ray sources
(Mrk 421, Mrk 501) and very high-luminosity IR galaxies (Mrk 231).
The classifications of Mrk galaxies for activity types have been
carried out based on old mostly poor-quality and inhomogeneous spectra
(relatively low-resolution photographic spectra and low S/N spectra).
The Sloan Digital Sky Surveys (SDSS) provides ∼90% of the existing
medium-resolution spectra, and is a relevant homogeneous database for
classification of galaxies. Our aim was to obtain homogeneous
classifications of Mrk galaxies by means of the SDSS spectra.
Based on our work on the classification of newly revealed objects from
various recent catalogs, we developed a fine classification scheme for
activity types based on the homogeneous database of the SDSS
spectroscopy. This scheme was applied to Mrk galaxies having spectra
in the SDSS (779 out of 1544, 50.45%).
As a result, 779 Mrk galaxies now have homogeneous optical spectral
classification that can be used for further studies and statistics of
their physical and spatial properties. We revealed 2 QSOs, 49
classical Seyferts (broad-line Seyferts 1, BLS1s), 17 narrow-line
Seyferts 1 (NLS1s), 4 Sy2s, 12 LINERs, 11 active galactic nuclei (AGN)
without a definite type, 31 Composite spectrum objects, and 533
HII/Starbursts. Due to low-quality spectra, some objects were left
without definite activity types and were classified as emission or
absorption galaxies.
Description:
For optical classification, we used SDSS spectra (Abdurro'uf et al.
(2022ApJS..259...35A 2022ApJS..259...35A, Cat. III/286); Ahumada et al.
(2020ApJS..249....3A 2020ApJS..249....3A, Cat. V/154)) for Markarian galaxies. In total,
779 objects out of 1544 have spectra in SDSS.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 140 779 SDSS Activity Types for 779 Markarian galaxies
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See also:
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
III/286 : APOGEE-2 DR17 final allStar catalog (Abdurro'uf+, 2022)
VII/274 : The Roma BZCAT - 5th edition (Massaro+, 2015)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Mrk Markarian name
5 A1 --- m_Mrk [ab] Multiplicity index on Mrk
7- 16 F10.6 deg RAdeg Right ascension (J2000), SDSS
18- 27 F10.6 deg DEdeg Declination (J2000), SDSS
29- 34 F6.3 mag umag SDSS u magnitude
36- 41 F6.3 mag gmag SDSS g magnitude
43- 48 F6.3 mag rmag SDSS r magnitude
50- 55 F6.3 mag imag SDSS i magnitude
57- 62 F6.3 mag zmag SDSS z magnitude
64- 66 A3 --- ClassBZCAT BZCAT classification (Cat. VII/274)
68- 74 A7 --- ClassPetro Petrosian et al. (2007ApJS..170...33P 2007ApJS..170...33P,
Cat. J/ApJS/170/33) classification
76-103 A28 --- ClassNED NED classification
105-108 A4 --- ClassVCV-13 VCV-13 classification (Veron-Cetty & Veron,
2010A&A...518A..10V 2010A&A...518A..10V, Cat. VII/258)
110-124 A15 --- NewAT New activity type (DD1, DD2, DD3 and by eye)
126-133 F8.6 --- z ? SDSS redshift
135-140 F6.2 mag rMAG ? Absolute SDSS r band magnitude
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Acknowledgements:
Areg Mickaelian, aregmick(at)yahoo.com
(End) Patricia Vannier [CDS] 04-Jan-2024