Excess line broadening in various objects - a case for weak magnetic effects

Details Excess line broadening in various objects - a case for weak magnetic effects Excess line broadening in various objects - a case for weak magnetic effects

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.220..289v&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 220, no. 2, p. 289-297

Astronomy and Astrophysics

Astrophysics

4

H Ii Regions, Line Shape, Magnetic Effects, Motion, Turbulence, Correlation, Least Squares Method, Logarithms, Statistical Analysis

Scientific paper

I present updated compilations of both observational data and theoretical predictions concerning excess line width and sizes in astrophysical bodies. After removing two well-known broadening mechanisms (thermal width due to large scale motions such as expansion), I analyze statisically the excess line width Wexcess. The excess line width shows a changing behavior with object size R, of the form Wexcess approximately = Rq. Taking all objects together, I find that q = 0.55 with s.d. = 0.05. This result extends previous studies to cover 5 decades in sizes, from 0.01 pc up to 1000 pc. Taking only objects with R less than 1 pc, I find that 1 = 0.7 with s.d. = 0.1, while taking only objects with R greater than 1 pc gives q = 0.5 with s.d. = 0.1; thus a steeper (not flatter) value of q at small R may be possible. Previous claims to derive a law for objects of sizes R greater than 1 kpc are discussed, in relation to the problem of removing obvious large scale motions from the observed line width. Thus several models with predicted q values between 0 and 1 can be eliminated, and the remaining ones could allow weak magnetic effects on the line widths.

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