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http://hdl.handle.net/2289/3334
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DC Field | Value | Language |
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dc.contributor.author | Sethi, S.K. | - |
dc.contributor.author | Subrahmanyan, Ravi | - |
dc.contributor.author | Roshi, Anish D. | - |
dc.date.accessioned | 2007-10-04T09:29:21Z | - |
dc.date.available | 2007-10-04T09:29:21Z | - |
dc.date.issued | 2007-07 | - |
dc.identifier.citation | The Astrophysical Journal, 2007, Vol.664, p1-7. | en |
dc.identifier.issn | E-ISSN: 1538-4357 | - |
dc.identifier.issn | P-ISSN: 0004-637X | - |
dc.identifier.uri | http://hdl.handle.net/2289/3334 | - |
dc.description | Restricted Access. Articles older than 2 years are open to all at the journal site (alternative location) | en |
dc.description.abstract | We 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.extent | 144070 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | en | en |
dc.publisher | The University of Chicago Press for the American Astronomical Society | en |
dc.relation.uri | http://adsabs.harvard.edu/cgi-bin/bib_query?2007ApJ...664....1S | en |
dc.relation.uri | http://arxiv.org/abs/0704.1226 | en |
dc.relation.uri | http://dx.doi.org/10.1086/518650 | en |
dc.rights | 2007 The American Astronomical Society | en |
dc.subject | Cosmic Microwave Background | en |
dc.subject | Line: Formation | en |
dc.subject | Radiative Transfer | en |
dc.subject | Radio Lines: General | en |
dc.title | Hydrogen 2p–2s Transition: Signals from the Epochs of Recombination and Reionization | en |
dc.type | Article | en |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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2007 APJ V664 p1.pdf Restricted Access | Restricted Access | 140.69 kB | Adobe PDF | View/Open Request a copy |
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