MEASUREMENT OF THE BLACK HOLE MASS IN NGC 1332 FROM ALMA OBSERVATIONS AT 0.044 ARCSECOND RESOLUTION

作者：Barth, Aaron J.^*; Boizelle, Benjamin D.; Darling, Jeremy; Baker, Andrew J.; Buote, David A.; Ho, Luis C.; Walsh, Jonelle L.

来源：Astrophysical Journal Letters, 2016, 822(2): L28.

DOI：10.3847/2041-8205/822/2/L28

• galaxies: bulges
• galaxies: individual (NGC 1332)
• galaxies: kinematics and dynamics
• galaxies: nuclei

We present Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 3 observations of CO(2-1) emission from the circumnuclear disk in the E/S0 galaxy NGC 1332 at 0.'' 044 resolution. The disk exhibits regular rotational kinematics and central high-velocity emission (+/- 500 km s(-1)) consistent with the presence of a compact central mass. We construct models for a thin, dynamically cold disk in the gravitational potential of the host galaxy and black hole and fit the beam-smeared model line profiles directly to the ALMA data cube. Model fits successfully reproduce the disk kinematics out to r = 200 pc. Fitting models just to spatial pixels within projected r = 50 pc of the nucleus (two times larger than the black hole's gravitational radius of influence), we find M-BH = (6.64(-0.63)(+0.63)) x 10(8) M-circle dot. This observation demonstrates ALMA's powerful capability to determine the masses of supermassive black holes by resolving gas kinematics on small angular scales in galaxy nuclei.

• 出版日期2016-5-10
• 单位北京大学