An Upper Limit on the Contribution of Galactic Free-Free Emission to the Cosmic Microwave Background Near the North Celestial Pole
We have observed the region of the sky north of 81° declination with a wide-angle CCD camera and narrow-band (1 nm) Hα filter. After subtracting the stellar background using off-band images and smoothing to 0.̊1 resolution, we set an upper limit on the anisotropy in the Hα emission at this angular s...
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| Veröffentlicht in: | Publications of the Astronomical Society of the Pacific 1996-04, Vol.108 (722), p.351-355 |
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| container_title | Publications of the Astronomical Society of the Pacific |
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| creator | Gaustad, John E. McCullough, Peter R. Van Buren, Dave |
| description | We have observed the region of the sky north of 81° declination with a wide-angle CCD camera and narrow-band (1 nm) Hα filter. After subtracting the stellar background using off-band images and smoothing to 0.̊1 resolution, we set an upper limit on the anisotropy in the Hα emission at this angular scale of 1.3 Rayleigh. At degree angular scales, the upper limit is 0.5 R, which corresponds to an anisotropy in the brightness temperature of the free-free emission at 32 GHz of 3 μK. Thus no more than 7% of the 44 μK anisotropy observed by Netterfield et al. (ApJ, 331, 341, 1995) can be due to free-free emission by Galactic hydrogen. |
| doi_str_mv | 10.1086/133729 |
| format | Article |
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After subtracting the stellar background using off-band images and smoothing to 0.̊1 resolution, we set an upper limit on the anisotropy in the Hα emission at this angular scale of 1.3 Rayleigh. At degree angular scales, the upper limit is 0.5 R, which corresponds to an anisotropy in the brightness temperature of the free-free emission at 32 GHz of 3 μK. Thus no more than 7% of the 44 μK anisotropy observed by Netterfield et al. (ApJ, 331, 341, 1995) can be due to free-free emission by Galactic hydrogen.</description><identifier>ISSN: 0004-6280</identifier><identifier>EISSN: 1538-3873</identifier><identifier>DOI: 10.1086/133729</identifier><language>eng</language><publisher>American Institute of Physics</publisher><subject>Anisotropy ; Cosmic microwave background radiation ; Declination ; Image filters ; Interstellar Medium and Nebulae ; Microwaves ; North celestial pole ; Observatories ; Optical filters ; Pixels ; Stars</subject><ispartof>Publications of the Astronomical Society of the Pacific, 1996-04, Vol.108 (722), p.351-355</ispartof><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c341t-4cd358121036a61ba3d93fb8580d081e4be8f63b84c3d71f8030e93ed4cc74ba3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/40680726$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/40680726$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>314,780,784,803,27924,27925,58017,58250</link.rule.ids></links><search><creatorcontrib>Gaustad, John E.</creatorcontrib><creatorcontrib>McCullough, Peter R.</creatorcontrib><creatorcontrib>Van Buren, Dave</creatorcontrib><title>An Upper Limit on the Contribution of Galactic Free-Free Emission to the Cosmic Microwave Background Near the North Celestial Pole</title><title>Publications of the Astronomical Society of the Pacific</title><description>We have observed the region of the sky north of 81° declination with a wide-angle CCD camera and narrow-band (1 nm) Hα filter. After subtracting the stellar background using off-band images and smoothing to 0.̊1 resolution, we set an upper limit on the anisotropy in the Hα emission at this angular scale of 1.3 Rayleigh. At degree angular scales, the upper limit is 0.5 R, which corresponds to an anisotropy in the brightness temperature of the free-free emission at 32 GHz of 3 μK. Thus no more than 7% of the 44 μK anisotropy observed by Netterfield et al. (ApJ, 331, 341, 1995) can be due to free-free emission by Galactic hydrogen.</description><subject>Anisotropy</subject><subject>Cosmic microwave background radiation</subject><subject>Declination</subject><subject>Image filters</subject><subject>Interstellar Medium and Nebulae</subject><subject>Microwaves</subject><subject>North celestial pole</subject><subject>Observatories</subject><subject>Optical filters</subject><subject>Pixels</subject><subject>Stars</subject><issn>0004-6280</issn><issn>1538-3873</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><recordid>eNo90MFOwzAMANAIgcQY8AdIOXErOE2WZsdRbQNpDA7sXKWpyzLaZkoyEFe-nI5NXGzJfrYsE3LN4I6BkveM8ywdn5ABG3GVcJXxUzIAAJHIVME5uQhhA8CYYjAgP5OOrrZb9HRhWxup62hcI81dF70td9H2BVfTuW60idbQmUdM9oFOWxvCvh3dcSS0PXi2xrsv_Yn0QZuPd-92XUWXqP0fWjof1zTHBkO0uqGvrsFLclbrJuDVMQ_JajZ9yx-Txcv8KZ8sEsMFi4kwFR8pljLgUktWal6NeV2qkYIKFENRoqolL5UwvMpYrYADjjlWwphM9HxIbg97-wND8FgXW29b7b8LBsX-c8Xhcz28OcBNiM7_KwFSQZZK_guIwWoA</recordid><startdate>19960401</startdate><enddate>19960401</enddate><creator>Gaustad, John E.</creator><creator>McCullough, Peter R.</creator><creator>Van Buren, Dave</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>19960401</creationdate><title>An Upper Limit on the Contribution of Galactic Free-Free Emission to the Cosmic Microwave Background Near the North Celestial Pole</title><author>Gaustad, John E. ; McCullough, Peter R. ; Van Buren, Dave</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c341t-4cd358121036a61ba3d93fb8580d081e4be8f63b84c3d71f8030e93ed4cc74ba3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1996</creationdate><topic>Anisotropy</topic><topic>Cosmic microwave background radiation</topic><topic>Declination</topic><topic>Image filters</topic><topic>Interstellar Medium and Nebulae</topic><topic>Microwaves</topic><topic>North celestial pole</topic><topic>Observatories</topic><topic>Optical filters</topic><topic>Pixels</topic><topic>Stars</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gaustad, John E.</creatorcontrib><creatorcontrib>McCullough, Peter R.</creatorcontrib><creatorcontrib>Van Buren, Dave</creatorcontrib><collection>CrossRef</collection><jtitle>Publications of the Astronomical Society of the Pacific</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gaustad, John E.</au><au>McCullough, Peter R.</au><au>Van Buren, Dave</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>An Upper Limit on the Contribution of Galactic Free-Free Emission to the Cosmic Microwave Background Near the North Celestial Pole</atitle><jtitle>Publications of the Astronomical Society of the Pacific</jtitle><date>1996-04-01</date><risdate>1996</risdate><volume>108</volume><issue>722</issue><spage>351</spage><epage>355</epage><pages>351-355</pages><issn>0004-6280</issn><eissn>1538-3873</eissn><abstract>We have observed the region of the sky north of 81° declination with a wide-angle CCD camera and narrow-band (1 nm) Hα filter. After subtracting the stellar background using off-band images and smoothing to 0.̊1 resolution, we set an upper limit on the anisotropy in the Hα emission at this angular scale of 1.3 Rayleigh. At degree angular scales, the upper limit is 0.5 R, which corresponds to an anisotropy in the brightness temperature of the free-free emission at 32 GHz of 3 μK. Thus no more than 7% of the 44 μK anisotropy observed by Netterfield et al. (ApJ, 331, 341, 1995) can be due to free-free emission by Galactic hydrogen.</abstract><pub>American Institute of Physics</pub><doi>10.1086/133729</doi><tpages>5</tpages><oa>free_for_read</oa></addata></record> |
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| source | Institute of Physics Journals; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection; JSTOR |
| subjects | Anisotropy Cosmic microwave background radiation Declination Image filters Interstellar Medium and Nebulae Microwaves North celestial pole Observatories Optical filters Pixels Stars |
| title | An Upper Limit on the Contribution of Galactic Free-Free Emission to the Cosmic Microwave Background Near the North Celestial Pole |
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