Excited-state hydroxyl maser polarimetry: Who ate all the πs?
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Green, J A; Caswell, Jams; McClure-Griffiths, Naomi
Description
We present polarimetric maser observations with the Australia Telescope Compact Array of excited-state hydroxyl (OH) masers. We observed 30 fields of OH masers in full Stokes polarization with the Compact Array Broadband Backend at both the 6030 and 6035 MHz excited-state OH transitions, and the 6668 MHz methanol maser transition, detecting 70 sites of maser emission. Amongst the OH we found 112 Zeeman pairs, of which 18 exhibited candidate π components. This is the largest single full...[Show more]
dc.contributor.author | Green, J A | |
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dc.contributor.author | Caswell, Jams | |
dc.contributor.author | McClure-Griffiths, Naomi | |
dc.date.accessioned | 2016-02-24T22:41:41Z | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.uri | http://hdl.handle.net/1885/98779 | |
dc.description.abstract | We present polarimetric maser observations with the Australia Telescope Compact Array of excited-state hydroxyl (OH) masers. We observed 30 fields of OH masers in full Stokes polarization with the Compact Array Broadband Backend at both the 6030 and 6035 MHz excited-state OH transitions, and the 6668 MHz methanol maser transition, detecting 70 sites of maser emission. Amongst the OH we found 112 Zeeman pairs, of which 18 exhibited candidate π components. This is the largest single full polarimetric study of multiple sites of star formation for these frequencies, and the rate of 16 per cent π components clearly indicates that the π component exists, and is comparable to the percentage recently found for groundstate transitions. This significant percentage of π components, with consistent proportions at both ground- and excited-state transitions, argues against Faraday rotation suppressing the π component emission. Our simultaneous observations of methanol found the expected low level of polarization, with no circular detected, and linear only found at the ≤10 per cent level for the brightest sources. | |
dc.publisher | Blackwell Publishing Ltd | |
dc.rights | Author/s retain copyright | |
dc.source | Monthly Notices of the Royal Astronomical Society | |
dc.title | Excited-state hydroxyl maser polarimetry: Who ate all the πs? | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 451 | |
dc.date.issued | 2015 | |
local.identifier.absfor | 020100 - ASTRONOMICAL AND SPACE SCIENCES | |
local.identifier.ariespublication | U3488905xPUB7549 | |
local.type.status | Published Version | |
local.contributor.affiliation | Green, J A, CSIRO Astronomy and Space Science | |
local.contributor.affiliation | Caswell, Jams, CSIRO | |
local.contributor.affiliation | McClure-Griffiths, Naomi, College of Physical and Mathematical Sciences, ANU | |
local.bibliographicCitation.issue | 1 | |
local.bibliographicCitation.startpage | 74 | |
local.bibliographicCitation.lastpage | 92 | |
local.identifier.doi | 10.1093/mnras/stv936 | |
dc.date.updated | 2016-02-24T10:14:19Z | |
local.identifier.scopusID | 2-s2.0-84938247741 | |
dcterms.accessRights | Open Access | |
Collections | ANU Research Publications |
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01_Green_Excited-state_hydroxyl_maser_2015.pdf | 3.13 MB | Adobe PDF |
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