SIMBAD references

2025PASJ...77..996I - Publ. Astron. Soc. Jap., 77, 996-1005 (2025/October-0)

Water maser disk and a supermassive black hole at the nucleus of the active galaxy NGC 7738.

ITO R., MIYAMOTO Y., NAKAI N., YAMAUCHI A. and TERASHIMA Y.

Abstract (from CDS):

We present the results of very long baseline interferometry (VLBI) observations of water vapor masers in the nucleus of the LINER galaxy NGC 7738 . The red- and blue-shifted and newly detected systemic maser features show an almost edge-on disk located at a distance of ${0.031}\!-\!{0.222}$ pc from the galactic center and rotating with a velocity of ${324}\!-\!{454}$ $\mathrm{km\:s^{-1}}$. The velocity field of the disk indicates sub-Keplerian rotation, suggesting a non-negligible disk mass. The Mestel disk model reveals the central and disk masses to be $({1.2}\, \pm \, {0.4})\times 10^6\, M_{\odot}$ and $({{4.7}\, \pm \, {1.5}})\times {10^{6}}\, M_{\odot}$, respectively. The mean volume density within the inner radius of the disk [$({1.2}\, \pm \, {0.5})\times {10^{10}}\, M_{\odot} \, \mathrm{pc^{-3}}$] strongly suggests the existence of a supermassive black hole at the center.

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Journal keyword(s): galaxies: active - galaxies: individual (NGC 7738) - galaxies: nuclei - masers

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 14

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