NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-25 T15:22:37 PDT
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For refcode 1988A&A...201..199A:
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NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
1988A&A...201..199A Correlations between integrated parameters and H{alpha} velocity widths in giant extragalactic H II regions: a new appraisal R. Arsenult and J.-R. Roy European Southern Observatory, Karl-Schwarzschild-Str. 2, D-0046 Garching, Federal Republic of Germany Departement de Physique et Observatoire Astronomique du Mont Megantic, Universite Laval, Quebec, Qc, Canada, G1K 7P4 Received November 27, 1987; accepted January 20, 1988 Summary. Investigations of relationships between diameters (or luminosities) and velocity widths of H{alpha} line profiles in giant extragalactic H II regions (GEHR) have firmly established that these parameters are correlated. However, three independent studies on the subject disagree on the slopes of these relations. It is shown that all measurements of the velocity width of integrated H{alpha} profiles of GEHRs are entirely consistent. Discrepancies in the relations are explained by different samples, and use of different parameters such as distances to galaxies and diameters of GEHRs. Assembling all observations of H{alpha} velocity widths, new values of slopes and zero-points are derived for the relations between luminosities (or diameters) and velocity widths. Comparisons are made with values given by different mechanisms predicting the scaling of supersonic motions with their linear sizes in nebulae. Key words: interstellar medium: H II regions: general - turbulence
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