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Polarisation observations of H_2O J_(K-1) K_1 = 5_(32) – 4_(41) 620.701 GHz maser emission with Herschel/HIFI in Orion KL

Jones, S. C. and Houde, M. and Harwit, M. and Kidger, M. and Kraus, A. and McCoey, C. and Marston, A. and Melnick, G. and Menten, K. M. and Morris, P. and Teyssier, D. and Tolls, V. (2014) Polarisation observations of H_2O J_(K-1) K_1 = 5_(32) – 4_(41) 620.701 GHz maser emission with Herschel/HIFI in Orion KL. Astronomy and Astrophysics, 567 . Art. No. A31. ISSN 0004-6361.

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Context. The high intensities and narrow bandwidths exhibited by some astronomical masers make them ideal tools for studying star-forming giant molecular clouds. The water maser transition J_(K-1K1) = 5_(32)−4_(41) at 620.701 GHz can only be observed from above Earth’s strongly absorbing atmosphere; its emission has recently been detected from space. Aims. We sought to further characterize the star-forming environment of Orion KL by investigating the linear polarisation of a source emitting a narrow 620.701 GHz maser feature with the heterodyne spectrometer HIFI on board the Herschel Space Observatory. Methods. High-resolution spectral datasets were collected over a thirteen month period beginning in 2011 March, to establish not only the linear polarisation but also the temporal variability of the source. Results. Within a 3σ uncertainty, no polarisation was detected to an upper limit of approximately 2%. These results are compared with coeval linear polarisation measurements of the 22.235 GHz J_(K-1K1) = 6_(16) – 5_(23) maser line from the Effelsberg 100-m radio telescope, typically a much stronger maser transition. Although strongly polarised emission is observed for one component of the 22.235 GHz maser at 7.2 km s^(-1), a weaker component at the same velocity as the 620.701 GHz maser at 11.7 km s^(-1) is much less polarised.

Item Type:Article
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URLURL TypeDescription DOIArticle
Jones, S. C.0000-0002-1952-3720
Kraus, A.0000-0001-9811-568X
Menten, K. M.0000-0001-6459-0669
Alternate Title:Polarisation observations of H2O J(K-1) K-1=5(32)-4(41) 620.701 GHz maser emission with Herschel/HIFI in Orion KL
Additional Information:© 2014 ESO. Article published by EDP Sciences. Received 17 December 2013; Accepted 4 June 2014. Published online 07 July 2014. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with significant participation from NASA. We thank D. Neufeld et al. (2013) for alerting us to the presence of the 621 GHz transition prior to publication. HIFI has been designed and built by a consortium of institutes and university departments from across Europe, Canada and the United States under the leadership of SRON Netherlands Institute for Space Research, Groningen, The Netherlands and with major contributions from Germany, France, and the US. Consortium members are: Canada: CSA, U. Waterloo; France: CESR, LAB, LERMA, IRAM; Germany: KOSMA, MPIfR, MPS; Ireland: NUI Maynooth; Italy: ASI, IFSI-INAF, Osservatorio Astrofisico di Arcetri- INAF; Netherlands: SRON, TUD; Poland: CAMK, CBK; Spain: Observatorio Astronomico Nacional (IGN), Centro de Astrobiología (CSIC-INTA); Sweden: Chalmers University of Technology – MC2, RSS & GARD, Onsala Space Observatory, Swedish National Space Board, Stockholm University – Stockholm Observatory; Switzerland: ETH Zurich, FHNW; USA: Caltech, JPL, NHSC. Partly based on observations with the 100-m telescope of the MPIfR (Max-Planck-Institut für Radioastronomie) at Effelsberg. M.H.’s research is funded through the NSERC Discovery Grant, Canada Research Chair, and Western’s Academic Development Fund programs. The work of M.O.H. has been supported by NASA through awards of JPL subcontracts 1393122 and 1463766 to Cornell University.
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Canada Research ChairUNSPECIFIED
Western’s Academic Development Fund ProgramUNSPECIFIED
Subject Keywords:magnetic fields – masers – polarisation – ISM: magnetic fields
Record Number:CaltechAUTHORS:20141010-140619665
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Official Citation:Polarisation observations of H2O JK-1 K1 = 532 − 441 620.701 GHz maser emission with Herschel/HIFI in Orion KL S. C. Jones, M. Houde, M. Harwit, M. Kidger, A. Kraus, C. MCoey, A. Marston, G. Melnick, K. M. Menten, P. Morris, D. Teyssier and V. Tolls A&A 567 A31 (2014) DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50341
Deposited By: Tony Diaz
Deposited On:10 Oct 2014 21:18
Last Modified:09 Mar 2020 13:18

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