Hydroxyl as a Tracer of H2 in the Envelope of MBM40

Details Hydroxyl as a Tracer of H2 in the Envelope of MBM40 Hydroxyl as a Tracer of H2 in the Envelope of MBM40

2012-03-03

arxiv.org/abs/1203.0684v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

23 pages, 3 figures, and 4 tables

Scientific paper

We observed 51 positions in the OH 1667 MHz main line transitions in the translucent, high latitude cloud MBM40. We detected OH in 8 out of 8 positions in the molecular core of the cloud and 24 out of 43 in the surrounding, lower extinction envelope and periphery of the cloud. Using a linear relationship between the integrated OH line intensity and E(B-V), we estimate the mass in the core, the envelope, and the periphery of the cloud to be 9.1, 13.7, and 1.5 solar masses. As much as 60% of the total cloud mass may be found in the envelope (0.12 \leq E(B-V) \leq 0.17 mag) and some molecular mass (6%) in the periphery (E(B-V) < 0.12 mag). The OH 1667 MHz line is an excellent tracers of gas in very low extinction regions and high-sensitivity mapping of the envelopes of molecular clouds may reveal the presence of significant quantities of molecular mass.

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