2014A&A...567A..31J


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST18:50:23

2014A&A...567A..31J - Astronomy and Astrophysics, volume 567A, 31-31 (2014/7-1)

Polarisation observations of H2O JK–1 K1 = 532-441 620.701 GHz maser emission with Herschel/HIFI in Orion KL.

JONES S.C., HOUDE M., HARWIT M., KIDGER M., KRAUS A., MCOEY C., MARSTON A., MELNICK G., MENTEN K.M., MORRIS P., TEYSSIER D. and TOLLS V.

Abstract (from CDS):

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 JK–1K1=532-441 at 620.701GHz can only be observed from above Earth's strongly absorbing atmosphere; its emission has recently been detected from space. We sought to further characterize the star-forming environment of Orion KL by investigating the linear polarisation of a source emitting a narrow 620.701GHz maser feature with the heterodyne spectrometer HIFI on board the Herschel Space Observatory. 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. 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 22.235GHz JK–1K1=616-523 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 22.235GHz maser at 7.2km/s, a weaker component at the same velocity as the 620.701GHz maser at 11.7km/s is much less polarised.

Abstract Copyright:

Journal keyword(s): magnetic fields - masers - polarisation - ISM: magnetic fields

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1015 2
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2001 1
3 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 848 1
4 V* VY CMa s*r 07 22 58.32877 -25 46 03.2355 12.01 10.19 7.95     M5Iae 996 0
5 W 49n HII 19 10 13.2 +09 06 12           ~ 411 3

    Equat.    Gal    SGal    Ecl

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2020.07.14-18:50:23

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