An OH survey of Orion South and GMC214 - 13

Details An OH survey of Orion South and GMC214 - 13 An OH survey of Orion South and GMC214 - 13

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..553j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 2, Jan. 1990, p. 553-562.

Astronomy and Astrophysics

Astronomy

10

Emission Spectra, Molecular Clouds, Orion Constellation, Sky Surveys (Astronomy), Stellar Mass, Interstellar Matter, Mass Distribution, Molecular Gases, Radio Spectra

Scientific paper

A low resolution large scale survey of OH main line emission is presented that covers Orion South and GMC214 - 13, the giant molecular cloud associated with MonR2. OH emission is detected down to the lowest contours in the (C-12)O survey of the Columbia group (Maddalena et al., 1986). An LTE approach gives a mass distribution in Orion South that is similar to that derived from (C-13)O and H2CO observations and differs from that of W(C-12)O. Peaks in the (C-12)O emission, coinciding with reflection nebulae, are found at depressions and strong gradients in the LTE OH column density distribution. The total mass of GMC214 - 13 is found to be (3 + or - 1) x 10 to the 5th and that of Orion South (10 + or - 3) x 10 to the 4th solar masses. In GMC214 - 13 there is no OB association nor is there a similar area of dense matter or a strong velocity gradient as observed in Orion South.

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