The LMC H II region N4A and its unusual molecular cloud

Details The LMC H II region N4A and its unusual molecular cloud The LMC H II region N4A and its unusual molecular cloud

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..960h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 3, p. 960-974

Astronomy and Astrophysics

Astronomy

9

H Ii Regions, Magellanic Clouds, Molecular Clouds, Radio Astronomy, Abundance, Cosmic Dust, Data Reduction, Density Distribution, Gas Temperature, Interstellar Matter, Morphology, Spectrum Analysis

Scientific paper

We present a comprehensive study of the large magellanic cloud (LMC) H II region N4A and its associated molecular cloud using a relatively large amount of data obtained with various observational techniques. We investigate the physical characteristics of the H II region, in particular the morphology, density structure, gas temperature, dust distribution, chemical abundances, etc. A low-brightness filamentary pattern is brought out in N4A. The possible causes of this feature (stellar wind, supernova explosion, magnetic field, molecular cloud) are discussed. The overall extinction towards N4A is AV approximately 0.4 mag. However, it amounts to as high as 3.7 mag in the direction of a compact knot of ionized gas lying in front of the H II region. We investigate the physical parameters of the associated molecular cloud extensively observed in transitions (12)CO(1-0), (12)CO(2-1) and (13)CO(1-0). The cloud is unusual mainly because the emission ratio (12)CO(2-1)/(12)CO(1-0) is much greater than 1 in its part close to N4A. This part is probably a thin molecular sheet in front of the H II region. Moreover, a prominent velocity structure is detected in the molecular cloud with two main components at VLSR = 272.5 and 278.5 km/s. The ionized gas is redshifted with respect to the CO velocity counterpart by as much as 14.6 km/s. A molecular hydrogen mass of approximately 3 x 104 is derived for the main component of the molecular cloud.

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