BASS. XXXV. Stellar vel. dispersion of type 1 AGNs

We present two independent measurements of stellar velocity dispersions ({sigma}) from the CaII H+K {lambda}3969,3934 and MgIb{lambda}5183,5172,5167 region (3880-5550{AA}) and the calcium triplet region (8350-8750{AA}) for 173 hard X-ray-selected Type 1 active galactic nuclei (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 virial black hole mass (M_BH_) estimates and {sigma} measurements obtained from high spectral resolution data, allowing us to test the usage of such methods for supermassive black hole studies. We find that the two independent {sigma} measurements are highly consistent with each other, with an average offset of only 0.002+/-0.001dex. Comparing MBH estimates based on broad emission lines and stellar velocity dispersion measurements, we find that the former is systematically lower by ~0.12dex. 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. We also find an anticorrelation between the offset from the M_BH_-{sigma} relation and the Eddington ratio. Our sample of Type 1 AGNs shows a shallower M_BH_-{sigma}* 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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Creator Caglar T.; Koss M.J.; Burtscher L.; Trakhtenbrot B.; Erdim M.K.,Mejia-Restrepo J.E.; Ricci F.; Powell M.C.; Ricci C.; Mushotzky R.,Bauer F.E.; Ananna T.T.; Bar R.E.; Brandl B.; Brinchmann J.; Harrison F.,Ichikawa K.; Kakkad D.; Oh K.; Riffel R.; Sartori L.F.; Smith K.L.,Stern D.; Urry C.M.
Publisher CDS
Publication Year 2024
OpenAccess true
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Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Cosmology; Galactic and extragalactic Astronomy; High Energy Astrophysics; Interdisciplinary Astronomy; Natural Sciences; Observational Astronomy; Physics