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High angular resolution millimetre continuum observations and modelling of S140-IRS1
Maud, Luke T.; Hoare, Melvin G.; Gibb, Andy G.; Shepherd, Debra; Indebetouw, Rémy
AA(Department of Physics and Astronomy, University of Leeds, Leeds LS2 9JT; ), AB(Department of Physics and Astronomy, University of Leeds, Leeds LS2 9JT), AC(Department of Physics and Astronomy, 6224 Agricultural Road, University of British Columbia, Vancouver, BC V6T 1Z1 Canada), AD(National Radio Astronomy Observatory, Socorro, NM 87801, USA†; Square Kilometre Array-Africa, 3rd Floor, The Park, Park Road, Pinelands 7405, South Africa), AE(Department of Astronomy, University of Virginia, Charlottesville, VA 22904-4325, USA)
Monthly Notices of the Royal Astronomical Society, Volume 428, Issue 1, p.609-624 (MNRAS Homepage)
Publication Date:
Astronomy Keywords:
techniques: high angular resolution, stars: early-type, stars: formation, stars: individual: S140-IRS1, ISM: jets and outflows, radio continuum: stars
Abstract Copyright:
2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Bibliographic Code:


We present high-resolution 1.3 mm continuum observations of the massive young stellar object S140-IRS1. S140-IRS1 is a disc wind prototype with elongated radio emission (PA ˜ 45°) perpendicular to the large-scale CO outflow in the region. The observations taken with the CARMA B array and the Submillimetre Array (SMA) compact configuration correspond to a spatial resolution of 0.3 and 3.0 arcsec, respectively. Complementary 2.7 and 3.5 mm data taken with OVRO in a compact configuration are also discussed. The deconvolved position angle for S140-IRS1 of 37° ±15° is compatible with a disc perpendicular to the main CO outflow and near-infrared monopolar reflection nebula. We have utilized two-dimensional axisymmetric radiative transfer modelling to interpret the millimetre wave emission from S140-IRS1. The model required the addition of a disc component, as the observed image, flux and visibilities cannot be represented solely by a dusty envelope with polar cavities. We report that the high-resolution image of S140-IRS1 is consistent with the interpretation of emission from a dust disc in a large-scale envelope with cleared bipolar cavities. Strong continuum emission is also detected in both SMA and OVRO maps from the previously discovered submillimetre source S140-SMM1 and from the infrared source S140-IRS3. Furthermore, S140-SMM1 is identified with maser sources whose proper motions are consistent with being the source of the outflow with position angle ˜20° previously associated by some authors with a second outflow created by S140-IRS1. Our findings are consistent with a disc wind interpretation of the radio emission for S140-IRS1 rather than that of a jet.
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