Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1443
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dc.contributor.authorDeshpande, A.A.-
dc.contributor.authorDwarakanath, K.S.-
dc.contributor.authorGoss, W.M.-
dc.date.accessioned2006-08-24T11:24:28Z-
dc.date.available2006-08-24T11:24:28Z-
dc.date.issued2000-11-01-
dc.identifier.citationAstrophysical Journal, 2000, Vol.543, p227-234en
dc.identifier.issn0004-637X-
dc.identifier.issn1538-4357(Online)-
dc.identifier.urihttp://hdl.handle.net/2289/1443-
dc.description.abstractWe have obtained the power spectral description of the density and opacity fluctuations of the cold H I gas in the Galaxy toward Cas A and Cygnus A. We have employed a method of deconvolution, based on CLEAN, to estimate the true power spectrum of optical depth of cold H I gas from the observed distribution, taking into account the finite extent of the background source and the incomplete sampling of optical depth over the extent of the source. We investigate the nature of the underlying spectrum of density fluctuations in the cold H I gas which would be consistent with that of the observed H I optical depth fluctuations. These power spectra for the Perseus arm toward Cas A and for the outer arm toward Cygnus A have a slope of 2.75+/-0.25 (3 σ error). The slope in the case of the Local arm toward Cygnus A is 2.5 and is significantly shallower in comparison. The linear scales probed here range from 0.01 to 3 pc. We discuss the implications of our results, the non-Kolmogorov nature of the spectrum, and the observed H I opacity variations on small transverse scales.en
dc.format.extent299268 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherThe University of Chicago Press for the American Astronomical Societyen
dc.relation.urihttp://dx.doi.org/10.1086/317104en
dc.rights(2000) by the American Astronomical Society.en
dc.subjectISM: Structure,en
dc.subjectMethods: Data Analysis,en
dc.subjectRadio Lines: ISMen
dc.subjectTechniques: Image Processingen
dc.subjectTechniques: Interferometric, Turbulenceen
dc.titlePower spectrum of the density of cold atomic gas in the galaxy toward Cassiopeia A and Cygnus Aen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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