Supersonic gas motion in giant extragalactic HII regions

Details Supersonic gas motion in giant extragalactic HII regions Supersonic gas motion in giant extragalactic HII regions

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.302..677m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 302, Issue 4, pp. 677-683.

Astronomy and Astrophysics

Astronomy

34

Scientific paper

We present high signal-to-noise ratio, long-slit spectra of the central region of the 30 Doradus nebula taken with unprecedented spatial (~ 0.1 pc) and spectral (~ 3 km s-1) resolution. We use these observations to investigate the dominant line-broadening mechanisms for the global nebula. We find no evidence for significant gravitational broadening of the lines. Thus, broadening appears to be dominated by stellar winds and thermal motions. However, we identify a new broad component to the lines that explains the integrated profile wings identified in previous observations. The broad component appears at all positions observed, and is possibly related to the disruption through photo-evaporation of high-density condensations within the nebula.

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