Other
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306..142l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 1, 1986, p. 142-159. Research supported by the California Institu
Other
66
Compression Waves, Molecular Gases, Ophiuchi Clouds, Star Formation, Stellar Cores, Stellar Evolution, Astronomical Maps, Carbon Monoxide, Emission Spectra, Formaldehyde, Gas Density, Spatial Distribution, Star Clusters, Stellar Mass
Scientific paper
Emission maps from a variety of molecules identify two adjacent, unusual regions in the star-forming Rho Oph cloud. The first is a region of intense DCO(+) emission that arises in a compact (0.26 x 0.10 pc), dense (about 500,000/cu cm), massive (40 solar masses), yet cold (less than 20 K) core. The second is a separate region of rare 2 cm H2CO emission at slightly blueshifted velocities bordering the southwestern tip of the DCO(+) emission region. This second (0.15 x 0.03 pc) region has a density greater than 10 to the 6th/cu cm and a mass of at least 18 solar masses and is warmer than the first region. There is sufficient mass in this core complex to form a massive star, but, unlike other similar, more distant, massive cores, there is no evidence for any embedded massive or high-luminosity stars. The dramatic differences between the spatial distributions of these unusual molecular emission regions suggests that the second region traces a high-density, warmed compression front propagating into the first region, a remnant of the original cloud.
Loren Robert B.
Wootten Al
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