New parametrizations of non-Gaussian line-of-sight velocity distribution | Zendy

Hongsheng Zhao | Zendy; Francisco Prada | Zendy

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New parametrizations of non-Gaussian line-of-sight velocity distribution

Author(s) -

Hongsheng Zhao,

Francisco Prada

Publication year - 1996

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/282.4.1223

Subject(s) - physics , line of sight , gaussian , line (geometry) , distribution (mathematics) , astrophysics , statistical physics , classical mechanics , mathematical analysis , geometry , quantum mechanics , mathematics

A five-parameter fitting formula for the line-of-sight stellar velocitydistributions of steady state systems is proposed. It can faithfully reproducevelocity distributions of theoretical models ranging from nearly Gaussianprofiles to strongly skewed or mildly double-peaked profiles. In contrast tovan der Marel and Franx (1993) and Kuijken and Merrifield (1993), the lineprofiles are required to have neither multi-peaks nor negative velocity wings.Information of the profile is mostly specified by five physically meaningfuland nearly orthogonal fitting parameters.Comment: submitted to MNRAS; 22 pages with 3 tables and 8 figures in uuencoded compressed PS file. Also available at ftp://ibm-1.mpa-garching.mpg.de/pub/hsz/profile.u

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