The central kinematics of NGC 1399 measured with 14pc resolution

Details The central kinematics of NGC 1399 measured with 14pc resolution The central kinematics of NGC 1399 measured with 14pc resolution

2005-10-10

arxiv.org/abs/astro-ph/0510278v1

Mon.Not.Roy.Astron.Soc.367:2-18,2006

Astronomy and Astrophysics

Astrophysics

19 pages, 9 figures. Accepted for publication in MNRAS. High resolution version available at http://www-astro.physics.ox.ac.

Scientific paper

10.1111/j.1365-2966.2005.09713.x

We present near infra-red (NIR) adaptive optics assisted spectroscopic observations of the CO ($\Delta\mu=2$) absorption bands towards the centre of the giant elliptical galaxy NGC 1399. The observations were made with NAOS-CONICA (ESO VLT) and have a FWHM resolution of 0\farcs15 (14pc). Kinematic analysis of the observations reveals a decoupled core and strongly non-Gaussian line-of-sight velocity profiles (VPs) in the central 0.2 arcsec (19pc). NIR imaging also indicates an asymmetric elongation of the central isophotes in the same region. We use spherical orbit-superposition models to interpret the kinematics, using a set of orthogonal ``eigenVPs'' that allow us to fit models directly to spectra. The models require a central black hole of mass $1.2^{+0.5}_{-0.6}\times10^9M_\odot$, with a strongly tangentially biased orbit distribution in the inner 40pc.

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