Query : 2006A&A...460..439D

2006A&A...460..439D - Astronomy and Astrophysics, volume 460, 439-448 (2006/12-3)

Measuring supermassive black holes with gas kinematics: the active S0 galaxy NGC 3998.


Abstract (from CDS):

We present results from a kinematical study of the gas in the nucleus of the active S0 galaxy NGC 3998 obtained from archival HST/STIS long-slit spectra. We analyzed the emission lines profiles and derived the map of the gas velocity field. The observed velocity curves are consistent with gas in regular rotation around the galaxy's center. By modeling the surface brightness distribution and rotation curve of the Hα emission line we found that the observed kinematics of the circumnuclear gas can be accurately reproduced by adding to the stellar mass component a compact dark mass (black hole) of MBH=2.7–2.0+2.4x108M (uncertainties at a 2σ level); the radius of its sphere of influence (Rsph∼0.16)" is well resolved at the HST resolution. The BH mass estimate in NGC 3998 is in good agreement with both the MBH-Mbul (with an upward scatter by a factor of ∼2) and MBH-σ correlations (with a downward scatter by a factor of ∼3-7, depending on the form adopted for the dependence of MBH on σ). Although NGC 3998 cannot be considered as an outlier, its location with respect to the MBH-σ relation conforms with the trend suggesting the presence of a connection between the residuals from the MBH-σ correlation and the bulge effective radius. In fact, NGC 3998 has one of the smallest values of Re among the galaxies with measured MBH (0.85kpc) and it shows a negative residual. This suggests that a combination of both σ and Re is necessary to drive the correlations between MBH and other bulge properties, an indication for the presence of a black holes ``fundamental plane''.

Abstract Copyright:

Journal keyword(s): black hole physics - galaxies: active - galaxies: bulges - galaxies: nuclei - galaxies: kinematics and dynamics

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 NGC 3998 SyG 11 57 56.1334044408 +55 27 12.922443432   11.64 12.10 10.09   ~ 604 2
2 NGC 5252 Sy2 13 38 15.8707724328 +04 32 33.521265600   15.21 14.21     ~ 448 0
3 NAME Local Group GrG ~ ~           ~ 7641 0

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