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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3334
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dc.contributor.authorSethi, S.K.-
dc.contributor.authorSubrahmanyan, Ravi-
dc.contributor.authorRoshi, Anish D.-
dc.date.accessioned2007-10-04T09:29:21Z-
dc.date.available2007-10-04T09:29:21Z-
dc.date.issued2007-07-
dc.identifier.citationThe Astrophysical Journal, 2007, Vol.664, p1-7.en
dc.identifier.issnE-ISSN: 1538-4357-
dc.identifier.issnP-ISSN: 0004-637X-
dc.identifier.urihttp://hdl.handle.net/2289/3334-
dc.descriptionRestricted Access. Articles older than 2 years are open to all at the journal site (alternative location)en
dc.description.abstractWe propose a method to study the epoch of reionization based on the possible observation of 2p-2s fine-structure lines from the neutral hydrogen outside the cosmological H II regions enveloping QSOs and other ionizing sources in the reionization era. We show that for parameters typical of luminous sources observed at z~=6.3, the strength of this signal, which is proportional to the H I fraction, has a brightness temperature ~=20 μK for a fully neutral medium. The fine-structure line from this redshift is observable at ν~=1 GHz, and we discuss prospects for the detection with several operational and future radio telescopes. We also compute the characteristics of this signal from the epoch of recombination; the peak brightness is expected to be ~=100 μK, and this signal appears in the frequency range 5-10 MHz. The signal from the recombination era is nearly impossible to detect owing to the extreme brightness of the Galactic emission at these frequencies.en
dc.format.extent144070 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherThe University of Chicago Press for the American Astronomical Societyen
dc.relation.urihttp://adsabs.harvard.edu/cgi-bin/bib_query?2007ApJ...664....1Sen
dc.relation.urihttp://arxiv.org/abs/0704.1226en
dc.relation.urihttp://dx.doi.org/10.1086/518650en
dc.rights2007 The American Astronomical Societyen
dc.subjectCosmic Microwave Backgrounden
dc.subjectLine: Formationen
dc.subjectRadiative Transferen
dc.subjectRadio Lines: Generalen
dc.titleHydrogen 2p–2s Transition: Signals from the Epochs of Recombination and Reionizationen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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