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      BASS XXXV. The MBH-σ Relation of 105-Month Swift-BAT Type 1 AGNs

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          Abstract

          We present two independent measurements of stellar velocity dispersions ( σ ) from the Ca\,H+K \& Mg\,\textsc{i} region (3880--5550~\AA) and the Calcium Triplet region (CaT, 8350--8750~\AA) for 173 hard X-ray-selected Type 1 AGNs (z 0.08) from the 105-month Swift-BAT catalog. We construct one of the largest samples of local Type 1 AGNs that have both single-epoch (SE) 'virial' black hole mass (MBH) estimates and σ measurements obtained from high spectral resolution data, allowing us to test the usage of such methods for SMBH studies. We find that the two independent σ measurements are highly consistent with each other, with an average offset of only 0.002±0.001 dex. Comparing MBH estimates based on broad emission lines and stellar velocity dispersion measurements, we find that the former is systematically lower by 0.12 dex. Consequently, Eddington ratios estimated through broad-line MBH determinations are similarly biased (but in the opposite way). We argue that the discrepancy is driven by extinction in the broad-line region (BLR). We also find an anti-correlation between the offset from the MBH - σ relation and the Eddington ratio. Our sample of Type 1 AGNs shows a shallower MBH - σ relation (with a power law exponent of 3.5) compared with that of inactive galaxies (with a power-law exponent of 4.5), confirming earlier results obtained from smaller samples.

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          Author and article information

          Journal
          03 August 2023
          Article
          2308.01800
          ade67dc9-d78b-4616-b121-a9ffe54bc798

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          Accepted by the ApJ
          astro-ph.GA

          Galaxy astrophysics
          Galaxy astrophysics

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