Astrophys. J., 819, 43 (2016/March-1)
A normal supermassive black hole in NGC 1277.
GRAHAM A.W., DURRE M., SAVORGNAN G.A.D., MEDLING A.M., BATCHELDOR D., SCOTT N., WATSON B. and MARCONI A.
Abstract (from CDS):
The identification of galaxies with "overly massive" black holes requires two measurements: a black hole mass (Mbh) and a host spheroid mass (Msph,*). Here we provide our measurements for NGC 1277. Our structural decomposition reveals that NGC 1277 is dominated by a "classical" spheroid with a Sersic index n = 5.3, a half-light radius Re,major=2.1 kpc, and a stellar mass of 2.7×1011 M☉ (using M*/LV=11.65, Martin-Navarro et al.). This mass is an order of magnitude greater than originally reported. Using the latest Mbh-n, Mbh-Msph,*, and Mbh-σ relations, the expected black hole mass is, respectively, (0.57–0.40+1.29)×109 M☉, (1.58–1.13+4.04)×109 M☉, and (2.27–1.44+4.04)×109 M☉ (using σ = 300 km s–1) for which the "sphere-of-influence" is 0.''31. Our new kinematical maps obtained from laser guide star assisted, adaptive optics on the Keck I Telescope dramatically reaffirm the presence of the inner, nearly edge-on, disk seen in the galaxy image. We also report that this produces a large velocity shear (∼400 km s–1) across the inner 0.''2 (70 pc) plus elevated values of sqrt(σ) 2+V2 across the inner (±3′′ / . 8)×(±0′′ / . 6) region of the galaxy. Our new multi-Gaussian expansion (MGE) models and Jeans Anisotropic MGE analysis struggled to match this extended component. Our optimal black hole mass, albeit a probable upper limit because of the disk is 1.2 x 109 M☉ (M/LV=12.3). This is an order of magnitude smaller than originally reported and 4 times smaller than recently reported. It gives an Mbh/Msph,* ratio of 0.45% in agreement with the median (≃0.5%) and range (0.1%-5.0%) observed in non-dwarf, early-type galaxies. This result highlights the need for caution with inner disks.
black hole physics - galaxies: individual: NGC 1277 - galaxies: kinematics and dynamics - galaxies: nuclei - galaxies: photometry - galaxies: structure
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