Journal Article

Dense gas and exciting sources of the molecular outflow in the AFGL 437 star-forming region

G. Manjarrez, J. F. Gómez and I. de Gregorio-Monsalvo

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 4, pages 3338-3345
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19973.x
Dense gas and exciting sources of the molecular outflow in the AFGL 437 star-forming region

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We present Very Large Array (VLA) high-resolution observations of the NH(1,1) and NH(2,2) molecular transitions towards the high-mass star-forming region AFGL 437. Our aim was to investigate if the poorly collimated CO molecular outflow previously detected in the region is the result of a projection effect, with no intrinsic bipolarity, as suggested by Gómez et al. We complemented our observations with radio continuum archived data from the VLA at 2 and 3.6 cm, and with unpublished public data at 450 m taken with Submillimetre Common-User Bolometer Array at the James Clerk Maxwell Telescope. Ammonia emission was found mainly in three clumps located at the south and east of the position of the compact infrared cluster of AFGL 437, where the CO outflow seemed to have its origin. One of the NH(1,1) clumps coincides with the maximum of NH(2,2) and with a local peak of emission at 450 m. A near-infrared source (s11) is also found at that position. Our continuum map at 2 cm shows extended elongated emission associated with the infrared source AFGL 437W. This elongated morphology and its spectral index between 3.6 and 2 cm (0.4) suggest the presence of a jet in AFGL 437W. We suggest that several molecular bipolar outflows may exist in the region. The observed CO outflow would be the superposition of those individual outflows, which would explain its low degree of collimation observed at larger scales.

Keywords: circumstellar matter; stars: formation; ISM: jets and outflows; ISM: individual objects: AFGL 437; infrared: stars

Journal Article.  5292 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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