BASS. XXIV. The BASS DR2 Spectroscopic Line Measurements and AGN Demographics

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dc.contributor.authorOh, Kyuseok
dc.contributor.authorKoss, Michael J.
dc.contributor.authorUeda, Yoshihiro
dc.contributor.authorStern, Daniel
dc.contributor.authorRicci, Claudio
dc.contributor.authorTrakhtenbrot, Benny
dc.contributor.authorPowell, Meredith C.
dc.contributor.authorden Brok, Jakob S.
dc.contributor.authorLamperti, Isabella
dc.contributor.authorMushotzky, Richard
dc.contributor.authorRicci, Federica
dc.contributor.authorBar, Rudolf E.
dc.contributor.authorRojas, Alejandra F.
dc.contributor.authorIchikawa, Kohei
dc.contributor.authorRiffel, Rogerio
dc.contributor.authorTreister, Ezequiel
dc.contributor.authorHarrison, Fiona
dc.contributor.authorUrry, C. Megan
dc.contributor.authorBauer, Franz E.
dc.contributor.authorSchawinski, Kevin
dc.date.accessioned2025-01-20T21:04:16Z
dc.date.available2025-01-20T21:04:16Z
dc.date.issued2022
dc.description.abstractWe present the second catalog and data release of optical spectral line measurements and active galactic nucleus (AGN) demographics of the BAT AGN Spectroscopic Survey, which focuses on the Swift-BAT hard X-ray detected AGNs. We use spectra from dedicated campaigns and publicly available archives to investigate spectral properties of most of the AGNs listed in the 70 month Swift-BAT all-sky catalog; specifically, 743 of the 746 unbeamed and unlensed AGNs (99.6%). We find a good correspondence between the optical emission line widths and the hydrogen column density distributions using the X-ray spectra, with a clear dichotomy of AGN types for N (H) = 10(22) cm(-2). Based on optical emission-line diagnostics, we show that 48%-75% of BAT AGNs are classified as Seyfert, depending on the choice of emission lines used in the diagnostics. The fraction of objects with upper limits on line emission varies from 6% to 20%. Roughly 4% of the BAT AGNs have lines too weak to be placed on the most commonly used diagnostic diagram, [O iii]lambda 5007/H beta versus [N ii]lambda 6584/H alpha, despite the high signal-to-noise ratio of their spectra. This value increases to 35% in the [O iii]lambda 5007/[O ii]lambda 3727 diagram, owing to difficulties in line detection. Compared to optically selected narrow-line AGNs in the Sloan Digital Sky Survey, the BAT narrow-line AGNs have a higher rate of reddening/extinction, with H alpha/H beta > 5 (similar to 36%), indicating that hard X-ray selection more effectively detects obscured AGNs from the underlying AGN population. Finally, we present a subpopulation of AGNs that feature complex broad lines (34%, 250/743) or double-peaked narrow emission lines (2%, 17/743).
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4365/ac5b68
dc.identifier.eissn1538-4365
dc.identifier.issn0067-0049
dc.identifier.urihttps://doi.org/10.3847/1538-4365/ac5b68
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/93228
dc.identifier.wosidWOS:000825854300001
dc.issue.numero1
dc.language.isoen
dc.revistaAstrophysical journal supplement series
dc.rightsacceso restringido
dc.titleBASS. XXIV. The BASS DR2 Spectroscopic Line Measurements and AGN Demographics
dc.typeartículo
dc.volumen261
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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