A MERLIN Study of 6-GHz excited-state OH and 6.7-GHz methanol masers in ON1
Multi-Element Radio Linked Interferometer Network (MERLIN) observations of 6.668-GHz methanol and both 6.031- and 6.035-GHz hydroxyl (OH) emission from the massive star formation region ON1 are presented. These are the first methanol observations made in full polarization using five antennas of MERL...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2007-12, Vol.382 (2), p.770-778 |
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| container_title | Monthly notices of the Royal Astronomical Society |
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| creator | Green, J. A. Richards, A. M. S. Vlemmings, W. H. T. Diamond, P. Cohen, R. J. |
| description | Multi-Element Radio Linked Interferometer Network (MERLIN) observations of 6.668-GHz methanol and both 6.031- and 6.035-GHz hydroxyl (OH) emission from the massive star formation region ON1 are presented. These are the first methanol observations made in full polarization using five antennas of MERLIN, giving high resolution and sensitivity to extended emission. Maser features are found to lie at the southern edge of the ultracompact H ii region, following the known distribution of ground-state OH masers. The masers cover a region ∼1 arcsec in extent, lying perpendicular to the H13CO+ bipolar outflow. Excited-state OH emission demonstrates consistent polarization angles across the strongest linearly polarized features which are parallel to the overall distribution. The linear polarizations vary between 10.0 and 18.5 per cent, with an average polarization angle of −60°± 28°. The strongest 6.668-GHz methanol features provide an upper limit to linear polarization of ∼1 per cent. Zeeman splitting of OH shows magnetic fields between −1.1 and −5.8 mG, and a tentative methanol magnetic field strength of −18 mG is measured. |
| doi_str_mv | 10.1111/j.1365-2966.2007.12418.x |
| format | Article |
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A. ; Richards, A. M. S. ; Vlemmings, W. H. T. ; Diamond, P. ; Cohen, R. J.</creator><creatorcontrib>Green, J. A. ; Richards, A. M. S. ; Vlemmings, W. H. T. ; Diamond, P. ; Cohen, R. J.</creatorcontrib><description>Multi-Element Radio Linked Interferometer Network (MERLIN) observations of 6.668-GHz methanol and both 6.031- and 6.035-GHz hydroxyl (OH) emission from the massive star formation region ON1 are presented. These are the first methanol observations made in full polarization using five antennas of MERLIN, giving high resolution and sensitivity to extended emission. Maser features are found to lie at the southern edge of the ultracompact H ii region, following the known distribution of ground-state OH masers. The masers cover a region ∼1 arcsec in extent, lying perpendicular to the H13CO+ bipolar outflow. Excited-state OH emission demonstrates consistent polarization angles across the strongest linearly polarized features which are parallel to the overall distribution. The linear polarizations vary between 10.0 and 18.5 per cent, with an average polarization angle of −60°± 28°. The strongest 6.668-GHz methanol features provide an upper limit to linear polarization of ∼1 per cent. 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The masers cover a region ∼1 arcsec in extent, lying perpendicular to the H13CO+ bipolar outflow. Excited-state OH emission demonstrates consistent polarization angles across the strongest linearly polarized features which are parallel to the overall distribution. The linear polarizations vary between 10.0 and 18.5 per cent, with an average polarization angle of −60°± 28°. The strongest 6.668-GHz methanol features provide an upper limit to linear polarization of ∼1 per cent. Zeeman splitting of OH shows magnetic fields between −1.1 and −5.8 mG, and a tentative methanol magnetic field strength of −18 mG is measured.</description><subject>Astronomy</subject><subject>Astrophysics</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>ISM: individual: ON1</subject><subject>masers</subject><subject>Methanol</subject><subject>polarization</subject><subject>Star & galaxy formation</subject><subject>Stars & galaxies</subject><subject>stars: formation</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2007</creationdate><recordtype>article</recordtype><recordid>eNqNkN9r2zAQx8VYoVm3_0EM1je7J8mWrJdCCF0clh-sa6H0RSiyxJw6dic5NOlfXyUpLfRp93IH97kPxxchTCAlsS5WKWE8T6jkPKUAIiU0I0W6_YQGb4vPaADA8qQQhJyiLyGsACBjlA_QryGeXV1PJ3P8p99UO9w5zJNx-Yzt1tS9rZLQ697iRYl1W2GeisNybfu_uu0avNbB-oDrFi_m5Cs6cboJ9ttrP0O3P69uRmUyXYwno-E0MXnOi8RKyoAzcHLJC8Y4ywpnDFvqii6lyTh3LrZM0ApcJWhBJcmMrCpiHLOCG3aGzo_eR9_929jQq3UdjG0a3dpuExSFnAHkMoLfP4CrbuPb-FtkBIvfiDxCxREyvgvBW6cefb3WfqcIqH3EaqX2Sap9kmofsTpErLbx9MerXwejG-d1a-rwfi8lgOQQucsj91Q3dvfffjWbXx_GKEiOgjr0dvsm0P5BccFErsq7eyV_UwLjm1Jx9gJAl5lp</recordid><startdate>200712</startdate><enddate>200712</enddate><creator>Green, J. 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J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c5568-e9230630f9b68336348fcc3bad2b9c466ff9c4472d0fd7282914c9dd1cf3e76c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2007</creationdate><topic>Astronomy</topic><topic>Astrophysics</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>ISM: individual: ON1</topic><topic>masers</topic><topic>Methanol</topic><topic>polarization</topic><topic>Star & galaxy formation</topic><topic>Stars & galaxies</topic><topic>stars: formation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Green, J. A.</creatorcontrib><creatorcontrib>Richards, A. M. S.</creatorcontrib><creatorcontrib>Vlemmings, W. H. T.</creatorcontrib><creatorcontrib>Diamond, P.</creatorcontrib><creatorcontrib>Cohen, R. 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J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A MERLIN Study of 6-GHz excited-state OH and 6.7-GHz methanol masers in ON1</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><addtitle>Monthly Notices of the Royal Astronomical Society</addtitle><date>2007-12</date><risdate>2007</risdate><volume>382</volume><issue>2</issue><spage>770</spage><epage>778</epage><pages>770-778</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><coden>MNRAA4</coden><abstract>Multi-Element Radio Linked Interferometer Network (MERLIN) observations of 6.668-GHz methanol and both 6.031- and 6.035-GHz hydroxyl (OH) emission from the massive star formation region ON1 are presented. These are the first methanol observations made in full polarization using five antennas of MERLIN, giving high resolution and sensitivity to extended emission. 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| source | Oxford Journals Open Access Collection; Wiley Online Library Journals Frontfile Complete |
| subjects | Astronomy Astrophysics Earth, ocean, space Exact sciences and technology ISM: individual: ON1 masers Methanol polarization Star & galaxy formation Stars & galaxies stars: formation |
| title | A MERLIN Study of 6-GHz excited-state OH and 6.7-GHz methanol masers in ON1 |
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