CONSTRAINTS ON FREE-FREE EMISSION FROM ANOMALOUS MICROWAVE EMISSION SOURCES IN THE PERSEUS MOLECULAR CLOUD
We present observations performed with the Green Bank Telescope at 1.4 and 5 GHz of three strips coincident with the anomalous microwave emission features previously identified in the Perseus molecular cloud at 33 GHz with the Very Small Array. With these observations we determine the level of the l...
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| Veröffentlicht in: | The Astrophysical journal 2013-06, Vol.770 (2), p.1-8 |
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| container_title | The Astrophysical journal |
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| creator | Tibbs, C T Paladini, R Dickinson, C Mason, B S Casassus, S Cleary, K Davies, R D Davis, R J Watson, R A |
| description | We present observations performed with the Green Bank Telescope at 1.4 and 5 GHz of three strips coincident with the anomalous microwave emission features previously identified in the Perseus molecular cloud at 33 GHz with the Very Small Array. With these observations we determine the level of the low frequency (~1-5 GHz) emission. We do not detect any significant extended emission in these regions and we compute conservative 3[sigma] upper limits on the fraction of free-free emission at 33 GHz of 27%, 12%, and 18% for the three strips, indicating that the level of the emission at 1.4 and 5 GHz cannot account for the emission observed at 33 GHz. Additionally, we find that the low frequency emission is not spatially correlated with the emission observed at 33 GHz. These results indicate that the emission observed in the Perseus molecular cloud at 33 GHz, is indeed in excess over the low frequency emission, hence confirming its anomalous nature. |
| doi_str_mv | 10.1088/0004-637X/770/2/122 |
| format | Article |
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With these observations we determine the level of the low frequency (~1-5 GHz) emission. We do not detect any significant extended emission in these regions and we compute conservative 3[sigma] upper limits on the fraction of free-free emission at 33 GHz of 27%, 12%, and 18% for the three strips, indicating that the level of the emission at 1.4 and 5 GHz cannot account for the emission observed at 33 GHz. Additionally, we find that the low frequency emission is not spatially correlated with the emission observed at 33 GHz. 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With these observations we determine the level of the low frequency (~1-5 GHz) emission. We do not detect any significant extended emission in these regions and we compute conservative 3[sigma] upper limits on the fraction of free-free emission at 33 GHz of 27%, 12%, and 18% for the three strips, indicating that the level of the emission at 1.4 and 5 GHz cannot account for the emission observed at 33 GHz. Additionally, we find that the low frequency emission is not spatially correlated with the emission observed at 33 GHz. These results indicate that the emission observed in the Perseus molecular cloud at 33 GHz, is indeed in excess over the low frequency emission, hence confirming its anomalous nature.</description><subject>Arrays</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>CLOUDS</subject><subject>Correlation</subject><subject>DUSTS</subject><subject>EMISSION</subject><subject>Emissions control</subject><subject>GHZ RANGE 01-100</subject><subject>LIMITING VALUES</subject><subject>Low frequencies</subject><subject>Microwave emission</subject><subject>MICROWAVE RADIATION</subject><subject>Molecular clouds</subject><subject>Strip</subject><subject>TELESCOPES</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqNkU1Pg0AQhjdGE2v1F3jZxIsXZD-AhSPBrSUB1vCh3jZ0u0SatlSWHvz3gjXGo5eZzOSZObwPALcYPWDk-zZCyLE8yt5sxpBNbEzIGZhhl_qWQ112Dma_xCW4MmYzjSQIZmATiawo8zDOygKKDC5yzq2pQJ7GRRF_r0QKw0ykYSKqAqZxlIvX8OUPUYgqj3gB4wyWSw6feV7wiRQJj6okzGE0Xj5eg4um3hp989PnoFrwMlpaiXiKozCxlOM6g-UxithqHawatfYIdV1KscJUIcpoo5XnUs8PcI0912c-UYgp0gTeWlO9ahqXOHQO7k5_OzO00qh20Opddfu9VoMkBBOGxr9zcH-iDn33cdRmkLvWKL3d1nvdHY3EDPsB9QhC_0BRgNmYsz-i9ISqvjOm14089O2u7j8lRnJSJafk5SRCjqokkaMq-gUdXnwS</recordid><startdate>20130620</startdate><enddate>20130620</enddate><creator>Tibbs, C T</creator><creator>Paladini, R</creator><creator>Dickinson, C</creator><creator>Mason, B S</creator><creator>Casassus, S</creator><creator>Cleary, K</creator><creator>Davies, R D</creator><creator>Davis, R J</creator><creator>Watson, R A</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>20130620</creationdate><title>CONSTRAINTS ON FREE-FREE EMISSION FROM ANOMALOUS MICROWAVE EMISSION SOURCES IN THE PERSEUS MOLECULAR CLOUD</title><author>Tibbs, C T ; Paladini, R ; Dickinson, C ; Mason, B S ; Casassus, S ; Cleary, K ; Davies, R D ; Davis, R J ; Watson, R A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c454t-67307bd9bfcd62355331c13c0373fec6536891a1658782c07c2f96de3ebff5243</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Arrays</topic><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>CLOUDS</topic><topic>Correlation</topic><topic>DUSTS</topic><topic>EMISSION</topic><topic>Emissions control</topic><topic>GHZ RANGE 01-100</topic><topic>LIMITING VALUES</topic><topic>Low frequencies</topic><topic>Microwave emission</topic><topic>MICROWAVE RADIATION</topic><topic>Molecular clouds</topic><topic>Strip</topic><topic>TELESCOPES</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Tibbs, C T</creatorcontrib><creatorcontrib>Paladini, R</creatorcontrib><creatorcontrib>Dickinson, C</creatorcontrib><creatorcontrib>Mason, B S</creatorcontrib><creatorcontrib>Casassus, S</creatorcontrib><creatorcontrib>Cleary, K</creatorcontrib><creatorcontrib>Davies, R D</creatorcontrib><creatorcontrib>Davis, R J</creatorcontrib><creatorcontrib>Watson, R A</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tibbs, C T</au><au>Paladini, R</au><au>Dickinson, C</au><au>Mason, B S</au><au>Casassus, S</au><au>Cleary, K</au><au>Davies, R D</au><au>Davis, R J</au><au>Watson, R A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>CONSTRAINTS ON FREE-FREE EMISSION FROM ANOMALOUS MICROWAVE EMISSION SOURCES IN THE PERSEUS MOLECULAR CLOUD</atitle><jtitle>The Astrophysical journal</jtitle><date>2013-06-20</date><risdate>2013</risdate><volume>770</volume><issue>2</issue><spage>1</spage><epage>8</epage><pages>1-8</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>We present observations performed with the Green Bank Telescope at 1.4 and 5 GHz of three strips coincident with the anomalous microwave emission features previously identified in the Perseus molecular cloud at 33 GHz with the Very Small Array. With these observations we determine the level of the low frequency (~1-5 GHz) emission. We do not detect any significant extended emission in these regions and we compute conservative 3[sigma] upper limits on the fraction of free-free emission at 33 GHz of 27%, 12%, and 18% for the three strips, indicating that the level of the emission at 1.4 and 5 GHz cannot account for the emission observed at 33 GHz. Additionally, we find that the low frequency emission is not spatially correlated with the emission observed at 33 GHz. These results indicate that the emission observed in the Perseus molecular cloud at 33 GHz, is indeed in excess over the low frequency emission, hence confirming its anomalous nature.</abstract><cop>United States</cop><doi>10.1088/0004-637X/770/2/122</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Arrays ASTROPHYSICS, COSMOLOGY AND ASTRONOMY CLOUDS Correlation DUSTS EMISSION Emissions control GHZ RANGE 01-100 LIMITING VALUES Low frequencies Microwave emission MICROWAVE RADIATION Molecular clouds Strip TELESCOPES |
| title | CONSTRAINTS ON FREE-FREE EMISSION FROM ANOMALOUS MICROWAVE EMISSION SOURCES IN THE PERSEUS MOLECULAR CLOUD |
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