Issue |
A&A
Volume 479, Number 2, February IV 2008
|
|
---|---|---|
Page(s) | 355 - 363 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20078570 | |
Published online | 18 December 2007 |
Measuring supermassive black holes with gas kinematics*
II. The LINERs IC 989, NGC 5077, and NGC 6500
1
INAF – Osservatorio Astronomico di Torino, Strada Osservatorio 20, 10025 Pino Torinese, Italy e-mail: [defrancesco;capetti]@oato.inaf.it
2
Dipartimento di Astronomia e Scienza dello Spazio, Università di Firenze, Largo E. Fermi 2, 50125 Firenze, Italy e-mail: marconi@arcetri.astro.it
Received:
29
August
2007
Accepted:
26
October
2007
We present results from a kinematical study of the gas in the
nucleus of a sample of three LINER galaxies, obtained from archival HST/STIS
long-slit spectra. We found that, while for the elliptical galaxy NGC 5077, the
observed velocity curves are consistent with gas in regular rotation around
the galaxy's center, this is not the case for the two remaining objects.
By modeling the surface brightness distribution and rotation curve from
the emission lines in NGC 5077, we found that the observed
kinematics of the circumnuclear gas can be accurately reproduced by adding to
the stellar mass component a black hole mass of (uncertainties at a 1σ level);
the radius of its sphere of influence (
) is
well-resolved at the HST resolution. The BH mass estimate in NGC 5077 is in
fairly good agreement with both the
(with an upward
scatter of ~0.4 dex) and
correlations (with an upward
scatter of 0.5 dex in the Tremaine et al. form and essentially
no scatter using the Ferrarese et al. form) and provides further support for
the presence of a connection between the residuals from the
correlation and the bulge effective radius. This
indicates the presence of a black hole's “fundamental plane” in the
sense that a combination of at least σ and Re drives the
correlations between MBH and host bulge properties.
Key words: black hole physics / galaxies: active / galaxies: bulges / galaxies: nuclei / galaxies: kinematics and dynamics
© ESO, 2008
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