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High-angular resolution observations of methanol in the infrared dark cloud core G11.11-0.12P1

Gόmez, L. and Wyrowski, F. and Pillai, T. and Leurini, S. and Menten, K. M. (2011) High-angular resolution observations of methanol in the infrared dark cloud core G11.11-0.12P1. Astronomy and Astrophysics, 529 . Art. No. A161. ISSN 0004-6361.

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Recent studies suggest that infrared dark clouds (IRDCs) have the potential of harboring the earliest stages of massive star formation and indeed evidence for this is found toward distinct regions within them. We present a study with the Plateau de Bure Interferometer of a core in the archetypal filamentary IRDC G11.11-0.12 of a few arcsecond resolution to determine its physical and chemical structures. The data consist of continuum and line observations covering the C^(34)S 2 → 1 line and the methanol 2_k → 1_k v_t = 0 lines at 3 mm and the methanol 5_k → 4_k v_t = 0 lines at 1 mm. Our observations show extended emission in the continuum at 1 and 3 mm. The methanol 2_k → 1_k v_t = 0 emission has three maxima extending over a 1 pc scale (when merged with single-dish short-spacing observations); one of the maxima is spatially coincident with the continuum emission. The fitting results show an enhanced methanol fractional abundance (~3 × 10^(-8)) at the central peak with respect to the other two peaks, where it decreases by about an order of magnitude (~4−6 × 10^(-9)). Evidence of extended 4.5 μm emission, “wings” in the CH_3OH 2_k → 1_k spectra, and CH_3OH abundance enhancements point to the presence of an outflow in the east-west direction. In addition, we find a gradient of ~4 km s^(-1) in the same direction, which we interpret as being produced by an outflow(s)-cloud interaction.

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Menten, K. M.0000-0001-6459-0669
Additional Information:© 2011 ESO. Received 14 December 2010. Accepted 7 March 2011. Published online 25 April 2011. Based on observations carried out with the IRAM Plateau de Bure Interferometer and the IRAM 30 m telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain). Fits images associated with the 1 mm and 3 mm continuum maps of Fig. 1 and the integrated intensity maps of Figs. 3−5, and 9 can be queried from the CDS via anonymous ftp to ( or via We acknowledge the IRAM staff at Pico Veleta and Plateau de Bure for carrying out the observations. L.G. thanks A. Castro-Carrizo and J. M. Winters for their help during the PdBI data reduction. We thank B. Parise for her evaluation of the manuscript and the referee for providing helpful comments and suggestions. L.G. was supported for this research through a stipend from the International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the Universities of Bonn and Cologne. T.P. acknowledges support from the Combined Array for Research in Millimeter-wave Astronomy (CARMA), which is supported by the National Science Foundation through grant AST 05-40399.
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International Max-Planck Research School (IMPRS)UNSPECIFIED
NSFAST 05-40399
Subject Keywords:ISM: abundances; ISM: individual objects: G11.11-0.12P1; ISM: molecules; techniques: interferometric; stars: formation
Record Number:CaltechAUTHORS:20110927-130256224
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Official Citation:High-angular resolution observations of methanol in the infrared dark cloud core G11.11-0.12P1 L. Gómez, F. Wyrowski, T. Pillai, S. Leurini and K. M. Menten A&A 529 A161 (2011) DOI: 10.1051/0004-6361/201016315
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25450
Deposited By: Ruth Sustaita
Deposited On:27 Sep 2011 20:25
Last Modified:03 Oct 2019 03:06

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