Astrophys. J., 880, 68-68 (2019/August-1)
H I spectroscopy of reverberation-mapped active galactic nuclei.
ROBINSON J.H., BENTZ M.C., JOHNSON M.C., COURTOIS H.M. and OU-YANG B.
Abstract (from CDS):
We present H I 21 cm spectroscopy from the Robert C. Byrd Green Bank Telescope for the host galaxies of 31 nearby active galactic nuclei with direct MBH measurements from reverberation mapping. These are the first published H I detections for 12 galaxies, and the spectral quality is generally an improvement over archival data for the remainder of the sample. We present measurements of emission-line fluxes, velocity widths, and recessional velocities from which we derive H I mass, total gas mass, and redshifts. Combining MGAS with constraints on MSTARS allows exploration of the baryonic content of these galaxies. We find a typical MGAS/MSTARS fraction of 10%, with a few reaching ∼30%-50%. We also examine several relationships between MSTARS, MGAS, MBH, baryonic mass, and morphological type. We find a weak preference for galaxies with larger MGAS to host more massive black holes. We also find gas-to-stellar fractions to weakly correlate with later types in unbarred spirals, with an approximately constant fraction for barred spirals. Consistent with previous studies, we find declining MGAS/MSTARS with increasing MSTARS, with a slope suggesting the gas reservoirs have been replenished. Finally, we find a clear relationship for MBH-MBARY with a similar slope as MBH-MSTARS reported by Bentz & Manne-Nicholas. The dwarf Seyfert NGC 4395 appears to follow this relationship as well, even though it has a significantly higher gas fraction and smaller MBH than the remainder of our sample.
© 2019. The American Astronomical Society. All rights reserved.
galaxies: active - galaxies: nuclei - galaxies: Seyfert - radio lines: galaxies
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