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The Megamaser Cosmology Project. X. High-resolution Maps and Mass Constraints for SMBHs

Author(s): Zhao, W; Braatz, JA; Condon, JJ; Lo, KY; Reid, MJ; et al

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Abstract: We present high-resolution (submas) Very Long Baseline Interferometry maps of nuclear H2O megamasers for seven galaxies. In UGC. 6093, the well-aligned systemic masers and high-velocity masers originate in an edge-on, flat disk and we determine the mass of the central supermassive black holes (SMBH) to be M-SMBH= 2.58. x. 10(7) M-circle dot (+/- 7%). For J1346+ 5228, the distribution of masers is consistent with a disk, but the faint high-velocity masers are only marginally detected, and we constrain the mass of the SMBH to be in the range (1.5-2.0). x. 10(7) M-circle dot. The origin of the masers in Mrk. 1210 is less clear, as the systemic and high-velocity masers are misaligned and show a disorganized velocity structure. We present one possible model in which the masers originate in a tilted, warped disk, but we do not rule out the possibility of other explanations including outflow masers. In NGC. 6926, we detect a set of redshifted masers, clustered within a parsec of each other, and a single blueshifted maser about 4.4 pc away, an offset that would be unusually large for a maser disk system. Nevertheless, if it is a disk system, we estimate the enclosed mass to be M-SMBH <. 4.8. x. 10(7) M-circle dot. For NGC. 5793, we detect redshifted masers spaced about 1.4 pc from a clustered set of blueshifted features. The orientation of the structure supports a disk scenario as suggested by Hagiwara et al. We estimate the enclosed mass to be M-SMBH <. 1.3. x. 10(7) M-circle dot. For NGC 2824 and J0350-0127, the masers may be associated with parsec-or subparsec-scale jets or outflows.
Publication Date: 20-Feb-2018
Electronic Publication Date: 20-Feb-2018
Citation: Zhao, W, Braatz, JA, Condon, JJ, Lo, KY, Reid, MJ, Henkel, C, Pesce, DW, Greene, JE, Gao, F, Kuo, CY, Impellizzeri, CMV. (2018). The Megamaser Cosmology Project. X. High-resolution Maps and Mass Constraints for SMBHs. ASTROPHYSICAL JOURNAL, 854 (10.3847/1538-4357/aaa95c
DOI: doi:10.3847/1538-4357/aaa95c
ISSN: 0004-637X
EISSN: 1538-4357
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Type of Material: Journal Article
Journal/Proceeding Title: ASTROPHYSICAL JOURNAL
Version: Final published version. This is an open access article.

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