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http://hdl.handle.net/20.500.12386/32789
Title: | 3D velocity fields from methanol and water masers in an intermediate-mass protostar | Authors: | Goddi, C. MOSCADELLI, Luca SANNA, ALBERTO |
Issue Date: | 2012 | Volume: | Cosmic Masers - from OH to H0 | Editors: | Booth, R.S.; Humphreys, E.M.L.; Vilemmings, W.H.T. | Series: | PROCEEDINGS OF THE INTERNATIONAL ASTRONOMICAL UNION | Number: | vol. 8, S287 | First Page: | 401 | Abstract: | We report multi-epoch VLBI observations of molecular masers towards the high-mass star forming region AFGL 5142, leading to the determination of the 3D velocity field of circumstellar molecular gas at radii <0.''23 (or 400 AU) from the protostar MM-1. Our observations of CH<SUB>3</SUB>OH maser emission enabled, for the first time, a direct measurement of infall of a molecular envelope on to an intermediate-mass protostar (radius of 300 AU, velocity of 5 km s<SUP>-1</SUP>, and infall rate of 6 × 10<SUP>-4</SUP> n <SUB>8</SUB> M <SUB>⊙</SUB> yr<SUP>-1</SUP>, where n <SUB>8</SUB> is the ambient volume density in units of 10<SUP>8</SUP> cm<SUP>-3</SUP>). In addition, our measurements of H<SUB>2</SUB>O maser (and radio continuum) emission revealed a collimated bipolar molecular outflow (and ionized jet) from MM-1. The evidence of simultaneous accretion and outflow at small spatial scales, makes AFGL 5142 an extremely compelling target for high-angular resolution studies of high-mass star formation. | Conference Name: | Cosmic Masers - from OH to H0 | Conference Place: | Stellenbosch, South Africa | Conference Date: | 29 January- 3 February, 2012 | URI: | http://hdl.handle.net/20.500.12386/32789 | URL: | https://www.cambridge.org/core/journals/proceedings-of-the-international-astronomical-union/article/3d-velocity-fields-from-methanol-and-water-masers-in-an-intermediatemass-protostar/EBED20947FBED1EF47D9D8234C783C06# https://api.elsevier.com/content/abstract/scopus_id/84864441011 |
ISSN: | 1743-9213 | ISBN: | 9781107032842 | DOI: | 10.1017/S1743921312007375 | Bibcode ADS: | 2012IAUS..287..401G | Fulltext: | open |
Appears in Collections: | 3.01 Contributi in Atti di convegno |
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Goddi_2012_IAUS.pdf | Pdf editoriale | 370.14 kB | Adobe PDF | View/Open |
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