Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.7703r&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #77.03; Bulletin of the American Astronomical Society, Vol. 24, p.1245
Astronomy and Astrophysics
Astronomy
Scientific paper
In order to obtain a complete picture of molecular clouds and star formation in the Milky Way it is important to understand cloud and star formation in a physical and chemical environment which is different from that in the inner parts of the Galaxy. The ideal locations for such a study are the massive-star forming clouds at the edge of our own Galaxy. Their galactocentric radius is large enough for the physical environment to be significantly different from that in the Inner Galaxy, e.g., the diffuse galactic interstellar radiation field is weaker, the metallicity is lower (Shaver et al. 1983, Silkey and Fich 1991), and the cosmic-ray flux is down (Bloemen et al. 1984), yet the objects are near enough to resolve their star-forming cores. This study concentrates on sources with galactocentric distances larger than 15 kpc, thus sampling sources further away from the galactic center than the works by Mead and Kutner (1988) and Mead et al. (1990). In this poster we present preliminary results for a systematic high-resolution (4''--8'') study of regions of high-mass star formation at large galactocentric radius. These observations include VLA continuum observations, used to probe the ionized gas in the regions, and thus the stellar content of the regions, as well as combined Kitt Peak 12-m and BIMA interferometer observations of CO (J = 1-> 0) and CS (J = 2-> 1) emission, to probe the molecular gas content of the clouds. Eleven regions were observed at three wavelengths (6, 3.6, and 2 cm) with the VLA of which 7 were detected. The seven objects detected have spectra consistent with optically thin free-free emission. A comparison of the far-infrared luminosities of the 7 detected objects with their 6 cm continuum luminosities shows that the observations are consistent with one star being the ionizing source as well as the heating source. For the undetected four objects, the far-IR luminosities can only be explained if a cluster of non-ionizing stars (later than B2) are present.
de Geus Eugene J.
Rudolph Alexander L.
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