Details

Autor(en) / Beteiligte

• Zhao, W.
• Braatz, J. A.
• Condon, J. J.
• Lo, K. Y.
• Reid, M. J.
• Henkel, C.
• Pesce, D. W.
• Greene, J. E.
• Gao, F.
• Kuo, C. Y.
• Impellizzeri, C. M. V.

Titel

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

Ist Teil von

• The Astrophysical journal, 2018-02, Vol.854 (2), p.124

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Elektronische Zeitschriftenbibliothek (Open access)

Beschreibungen/Notizen

• 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 MSMBH = 2.58 × 107 M ( 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) × 107 M . 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 MSMBH < 4.8 × 107 M . 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 MSMBH < 1.3 × 107 M . For NGC 2824 and J0350−0127, the masers may be associated with parsec- or subparsec-scale jets or outflows.