New Parametrizations of Non-Gaussian Line-of-sight Velocity Distribution

Details New Parametrizations of Non-Gaussian Line-of-sight Velocity Distribution New Parametrizations of Non-Gaussian Line-of-sight Velocity Distribution

1995-12-11

arxiv.org/abs/astro-ph/9512066v1

Astronomy and Astrophysics

Astrophysics

submitted to MNRAS; 22 pages with 3 tables and 8 figures in uuencoded compressed PS file. Also available at ftp://ibm-1.mpa-

Scientific paper

A five-parameter fitting formula for the line-of-sight stellar velocity distributions of steady state systems is proposed. It can faithfully reproduce velocity distributions of theoretical models ranging from nearly Gaussian profiles to strongly skewed or mildly double-peaked profiles. In contrast to van der Marel and Franx (1993) and Kuijken and Merrifield (1993), the line profiles are required to have neither multi-peaks nor negative velocity wings. Information of the profile is mostly specified by five physically meaningful and nearly orthogonal fitting parameters.

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