Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263..535g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 263, NO.2/JUL15, P. 535, 1993
Astronomy and Astrophysics
Astronomy
12
Ism: Clouds - Ism: Individual: Mon R2 - Ism: Individual: Orion Nebula - Ism: Structure - Radio Lines: Ism
Scientific paper
We discuss large-scale features in the neutral hydrogen (H I) towards Orion, as observed with the DRAO 26-m telescope. We identify features including (i) a clump of emission ≍ 3 × 6 deg2 in extent, to the west of Orion B, at negative velocities with respect to the LSR, which is possibly related to Barnard's Loop, (ii) an arc in the south-west at negative velocities, which is part of a large, expanding H I shell noted by Heiles, and which marks the outer edge of a large deficit of H I associated with the Eridanus X-ray hotspot, (iii) the elongated H I cloud associated with the Orion A and Orion B molecular clouds, (iv) H I associated with Mon R2, and (v) a clump of H I outside Barnard's Loop at positive velocities. The reported large-scale rotation of H I centred on the Orion nebula is shown to be an artefact due to the limited latitude coverage of some earlier H I observations.
Green David A.
Padman Rachael
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