A high-resolution H I survey of the Rosette Nebula

Details A high-resolution H I survey of the Rosette Nebula A high-resolution H I survey of the Rosette Nebula

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..664k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 2, p. 664-671.

Astronomy and Astrophysics

Astronomy

31

H I Regions, Molecular Clouds, Nebulae, Sky Surveys (Astronomy), Astronomical Maps, Emission Spectra, Interstellar Gas, Optical Thickness

Scientific paper

We analyzed the gross physical properties of the atomic gas associated with the Rosette Molecular Complex (RMC) which was derived from a new high-resolution 21 cm survey. At the distance of the RMC, the 4 arcmin angular resolution of the survey corresponds to a linear size of 2 pc. The H I maps presented here cover an area of 110 x 60 pc. If the 21 cm emission is optically thin, then the survey mapped an H I mass of 1.5 +/- 0.1 x 10 exp 5 solar masses. The optical nebula is surrounded by three dense H I regions, which roughly trace out the boundary of an H I shell. The shell is located at the periphery of the atomic cloud and is expanding into the cloud at 4.5 km/s. The expansion center is located at (l, b, v) = (206.266 deg, -2.083 deg, 16.0 km/s). A constant expansion velocity implies a dynamical age for the shell of about 4 million years, which is consistent with the age of the central cluster NGC 2244. The total kinetic energy of the expansion is estimated to be 3.8 x 10 exp 48 ergs. This represents about 2 percent of the total (radiative + mechanical) energy available from the central cluster. Thus the central cluster can provide sufficient energy to power the flow through a combination of stellar winds and radiation.

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