BAT AGN Spectroscopic Survey I: Spectral Measurements, Derived Quantities, and AGN Demographics

Abstract

We present the first catalog and data release of the Swift-BAT AGN Spectroscopic Survey (BASS). We analyze optical spectra of the majority of AGN (77%, 641/836) detected based on their 14-195 keV emission in the 70-month Swift BAT all-sky catalog. This includes redshift determination, absorption and emission line measurements, and black hole mass and accretion rate estimates for the majority of obscured and un-obscured AGN (74%, 473/641) with 340 measured for the first time. With ~90% of sources at z<0.2, the survey represents a significant census of hard-X-ray selected AGN in the local universe. In this first catalog paper, we describe the spectroscopic observations and datasets, and our initial spectral analysis. The FWHM of the emission lines show broad agreement with the X-ray obscuration (~94%), such that Sy 1-1.8 have NH<10^21.9 cm^-2, and Seyfert 2, have NH>10^21.9 cm^-2. Seyfert 1.9 show a range of column densities. Compared to narrow line AGN in the SDSS, the X-ray selected AGN have a larger fraction of dusty host galaxies suggesting these types of AGN are missed in optical surveys. Using the most sensitive [OIII]/Hbeta and [NII]/Halpha emission line diagnostic, about half of the sources are classified as Seyferts, ~15% reside in dusty galaxies that lack an Hbeta detection, but for which the line upper limits imply either a Seyfert or LINER, ~15% are in galaxies with weak or no emission lines despite high quality spectra, and a few percent each are LINERS, composite galaxies, HII regions, or in known beamed AGN.

arXiv commentAccepted ApJ, see www.bass-survey.com for data

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• Self-consistent population synthesis of AGN from observational constraints in the X-rays
• BASS. XLIV. Morphological preferences of local hard X-ray selected AGN
• Swift-XRT follow-up analysis of unidentified hard X-ray sources
• Cosmological simulations predict that AGN preferentially live in gas-rich, star-forming galaxies despite effective feedback
• AGILE: an end-to-end Rubin-LSST simulation of AGNs, galaxies, and stars I. Software description and first data release
• Galaxy Activity, Torus and Outflow Survey (GATOS) X: Molecular gas clumpiness under the influence of AGN
• The study of the circumnuclear environment of accreting supermassive black holes with realistic X-ray spectral models
• Low-Eddington ratio, changing-look active galactic nuclei: the case of NGC 4614
• Nuclear Activity and Host Galaxy Properties of Low-Luminosity AGN Identified from VLA Observations
• The X-ray coronae in NuSTAR bright active galactic nuclei
• Radio and X-ray flux rebrightening six years after outburst in a partially-obscured extreme changing-look AGN
• Fast, dust-poor outflows in the local candidate dual AGN MCG-03-34-64 observed with VLT/ERIS
• BASS XXX: Distribution Functions of DR2 Eddington-ratios, Black Hole Masses, and X-ray Luminosities
• Seeing through the dust: Unraveling near-infrared variability in type 2 active galactic nuclei
• The shortest detected intra-day variability of active galactic nuclei in TESS survey
• Chandra Follow-up Observations of Swift-BAT-selected AGNs II
• An XMM-Newton Analysis of the Supermassive Black Hole Binary Candidate MCG+11--11--032