J/A+A/674/A85 BPT class and AGN classification (Alban+, 2023)
Classifying the full SDSS-IV MaNGA Survey using optical diagnostic diagrams:
Presentation of AGN catalogs in flexible apertures.
Alban M., Wylezalek D.
<Astron. Astrophys. 674, A85 (2023)>
=2023A&A...674A..85A 2023A&A...674A..85A (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Equivalent widths ; Abundances ; Optical
Keywords: catalogs - galaxies: active
Abstract:
Accurate active galactic nucleus (AGN) identifications in large galaxy
samples are crucial for the assessment of the role of AGN and AGN
feedback in the co-evolution of galaxies and their central
supermassive black holes. Emission-line flux-ratio diagnostics are
commonly used to identify AGN in optical spectra. New large samples of
integral field unit observations allow exploration of the role of
aperture size in the classification process. In this paper, we present
galaxy classifications for all 10010 galaxies observed within the
Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. We
use Baldwin-Philips-Terlevich line flux-ratio diagnostics combined
with an Hα equivalent threshold in 60 apertures of varying size
for the classification, and provide the corresponding catalogs.
MaNGA-selected AGN primarily lie below the main sequence of
star-forming galaxies, and reside in massive galaxies with stellar
masses of ∼1011M☉ and a median Hα-derived star formation
rate of ∼1.44MM☉/yr. We find that the number of "fake" AGN
increases significantly beyond selection apertures of >1.0Reff
because of increased contamination from diffuse ionized gas (DIG). A
comparison with previous works shows that the treatment of the
underlying stellar continuum and flux measurements can significantly
impact galaxy classification. Our work provides the community with AGN
catalogs and galaxy classifications for the full MaNGA survey.
Description:
We used the final data release (DR17) of the SDSS-MaNGA survey
(10010 galaxies) to classify galaxies based on their BPT diagnostics.
We created catalogs using a range of apertures (in units of kpc,
arcsecond, and effective radius) as the basis of our classification.
In each aperture, we measure the BPT diagnostics and include an
EW(Hα) cut for the final AGN classification.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 109 10242 BPT class and AGN classification for
60 different apertures
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See also:
J/AJ/154/86 : MaNGA catalog, DR15 (Wake+, 2017)
https://www.sdss4.org/dr17/manga/manga-data/catalogs : MaNGA DR17 Home Page
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- MaNGA IDs from MaNGA
13 I1 --- AGN [0/1] Seyfert or LINERs with EWHa>3
15 I1 --- SEYFERT [0/1] Boolean array for SEYFERT galaxies
17 I1 --- LINER [0/1] Boolean array for LINER galaxies
19 I1 --- STAR-FORM [0/1] Boolean array for star forming galaxies
21 I1 --- Composite [0/1] Boolean array for composite galaxies
23 I1 --- Ambiguous [0/1] Boolean array for composite galaxies
25- 32 F8.5 --- log[OIII]/Hb ?=- Logarithmic [OIII]/Hβ ratio
34- 41 F8.5 --- log[NII]/Ha ?=- Logarithmic [NII]/Hα ratio
43- 50 F8.5 --- log[SII]/Ha ?=- Logarithmic [SII]/Hα ratio
52- 59 F8.5 --- log[OI]/Ha ?=- Logarithmic [OI]/Hα ratio
61- 70 F10.5 0.1nm EWHa ?=- Halpha Equivalent width
72- 89 F18.14 deg RAdeg Right Ascension (ICRS) at Ep=2016.0
91-109 F19.15 deg DEdeg Declination (ICRS) at Ep=2016.0
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Acknowledgements:
Marco Alban, malban(at)uni-heidelberg.de
(End) Patricia Vannier [CDS] 30-Mar-2023