Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-02
Astron.J.134:1952-1962,2007
Astronomy and Astrophysics
Astrophysics
29 pages, 16 figures reduced to the lowest qual. to fit the astro-ph size requirements, accepted by AJ
Scientific paper
10.1086/518558
We present excellent resolution and high sensitivity Very Large Array (VLA) observations of the 21cm HI line emission from the face-on galaxy NGC 1058, providing the first reliable study of the HI profile shapes throughout the entire disk of an external galaxy. Our observations show an intriguing picture of the interstellar medium; throughout this galaxy velocity-- dispersions range between 4 to 15 km/sec but are not correlated with star formation, stars or the gaseous spiral arms. The velocity dispersions decrease with radius, but this global trend has a large scatter as there are several isolated, resolved regions of high dispersion. The decline of star light with radius is much steeper than that of the velocity dispersions or that of the energy in the gas motions.
Petric Andreea Oana
Rupen Michael P.
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