On the stellar kinematical evidence for massive black holes in galactic nuclei expected with the Hubble Space Telescope

Details On the stellar kinematical evidence for massive black holes in galactic nuclei expected with the Hubble Space Telescope On the stellar kinematical evidence for massive black holes in galactic nuclei expected with the Hubble Space Telescope

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...432l..91v&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 432, no. 2, p. L91-L94

Astronomy and Astrophysics

Astronomy

22

Astronomical Models, Black Holes (Astronomy), Galactic Nuclei, Kinematics, Normal Density Functions, Velocity Distribution, Absorption Spectra, High Resolution, Hubble Space Telescope, Line Of Sight, Line Spectra, Spatial Resolution

Scientific paper

The central line-of-sight velocity distribution, or velocity profile (VP), of a stellar system with a massive central black hole has more extended wings than a Gaussian. The importance of these wings is studied for the high spatial resolution absorption-line spectra that are now being obtained with the Hubble Space Telescope (HST). As an example, the central VP is calculated for an isotropic dynamical model for M87 with a 5 x 109 solar mass black hole, for observations through a small circular aperture of diameter D. Conventional techniques for the analysis of galaxy spectra that assume Gaussian VPs strongly underestimate the true velocity dispersion (for D = 0.1 sec) by more than a factor of 2] At HST resolution it is thus essential to model VP deviations from a Gaussian. An actual VP shape measurement will strongly constrain any dynamical model, but might be difficult to obtain in practice.

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