2025PASJ...77..996I

Query : 2025PASJ...77..996I

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.

Abstract Copyright: © The Author(s) 2025. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved. For commercial re-use, please contact for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site-for further information please contact

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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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
2 SDSS J043703.67+245606.8 GiG 04 37 03.6816891024 +24 56 06.870657804           ~ 37 0
3 NGC 2273 Sy1 06 50 08.6691789600 +60 50 44.864645136   14.50 13.54     ~ 566 2
4 Z 286-10 Sy2 07 19 30.892 +59 21 18.48   13.3       ~ 148 0
5 NGC 2960 SyG 09 40 36.3826266216 +03 34 37.235848260   13.60       ~ 197 1
6 NGC 3079 Sy2 10 01 57.8789863992 +55 40 47.449758324 11.57 11.54 10.86     ~ 1476 3
7 IC 2560 Sy2 10 16 18.7073057664 -33 33 49.720274676   12.53 13.31 11.25 12.2 ~ 283 1
8 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2512 4
9 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1433 2
10 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1582 2
11 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1331 1
12 NGC 6323 GiG 17 13 18.0454114728 +43 46 56.772281424   14.8       ~ 103 1
13 IC 1481 Sy1 23 19 25.0863724296 +05 54 21.836715048   14.5       ~ 107 1
14 NGC 7738 LIN 23 44 02.0233516093 +00 30 59.758852365   14.4       ~ 112 1

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