The Contribution Of Galactic Free-Free Emission to Anisotropies in the Cosmic Microwave Background Found by the Saskatoon Experiment

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dc.contributor.authorSimonetti, John H.en
dc.contributor.authorDennison, B.en
dc.contributor.authorTopasna, G. A.en
dc.contributor.departmentInstitute for Particle, Nuclear and Astronomical Sciences (IPNAS)en
dc.contributor.departmentPhysicsen
dc.date.accessed2014-02-28en
dc.date.accessioned2014-03-10T13:18:52Zen
dc.date.available2014-03-10T13:18:52Zen
dc.date.issued1996-02en
dc.description.abstractWe made a sensitive, wide-field Ha image of the north celestial polar region. Using this image, we constrain the contribution of irregularities in interstellar free-free emission to the degree-scale anisotropies in the cosmic microwave background detected in recent observations at Saskatoon by the Princeton group. The analysis of the Her image mimics the Saskatoon data analysis: the resulting signal is the strength of irregularities sampled with the Saskatoon beam (i.e., degree-scale) along the 85 degrees declination circle. We found no such irregularities that could be attributed to Her emission. The implied upper bound on the rms variation in free-free brightness temperature is less than 4.6 mu K at 27.5 GHz. The observed cosmic microwave background anisotropies are much larger. Therefore, the contribution of irregularities in interstellar free-free emission to the observed anisotropies is negligible.en
dc.description.sponsorshipNational Science Foundation AST-9319670en
dc.description.sponsorshipHorton Foundation Granten
dc.identifier.citationJohn H. Simonetti et al. 1996 ApJ 458 L1 doi:10.1086/309915en
dc.identifier.doihttps://doi.org/10.1086/309915en
dc.identifier.issn0004-637Xen
dc.identifier.urihttp://hdl.handle.net/10919/25859en
dc.identifier.urlhttp://iopscience.iop.org/1538-4357/458/1/L1/en
dc.language.isoen_USen
dc.publisherIOP PUBLISHING LTDen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectcosmic microwave backgrounden
dc.subjectinstrumentation, miscellaneousen
dc.subjectism,en
dc.subjectgeneralen
dc.subjectradiometeren
dc.titleThe Contribution Of Galactic Free-Free Emission to Anisotropies in the Cosmic Microwave Background Found by the Saskatoon Experimenten
dc.title.serialAstrophysical Journalen
dc.typeArticle - Refereeden

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