Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/7547
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dc.contributor.advisorSubrahmanyan, Ravi-
dc.contributor.authorSingh, Saurabh-
dc.date.accessioned2020-10-09T11:19:32Z-
dc.date.available2020-10-09T11:19:32Z-
dc.date.issued2018-05-
dc.identifier.citationPh.D. Thesis, Indian Institute of Science, Bangalore, 2018en_US
dc.identifier.urihttp://hdl.handle.net/2289/7547-
dc.descriptionOpen Accessen_US
dc.description.abstractCosmic Dawn (CD), beginning with first light from the first stars and ultra-faint galaxies, and Epoch of Reionization (EoR), resulting in almost complete reionization of the primordial gas, marks an important period in the cosmic evolution of baryons. There is considerable uncertainty and limited observational constraints on the evolution of thermal and ionization state of the intergalactic medium (IGM) in this period as well as on the nature of the first sources of light that caused the transformation. One of the most promising probes of these epochs is the rest-frame global 21-cm signal of neutral hydrogen (HI) produced by the intergalactic medium (IGM) prior to the end of the EoR at z 6. The intensity of the signal is tied to the star formation history as well as to the ionization and thermal histories of the IGM. Hence, its measurement will bracket astrophysical properties of the first UV and X-ray sources including the ionizing efficiency of first stars and quasars, luminosity and spectra of the first population of black holes, and properties of dark matter particles. At present these properties are poorly understood allowing for a large variety of plausible 21-cm spectra.en_US
dc.language.isoenen_US
dc.publisherRaman Research Institute, Bangaloreen_US
dc.rightsThis thesis is posted here with the permission of the author. Personal use of this material is permitted. Any other use requires prior permission of the author. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.en_US
dc.subject.classificationAstronomy and Astrophysicsen
dc.titleObservational Constraints on Global 21-cm Signals from the Epoch of Reionizationen_US
dc.typeThesisen_US
Appears in Collections:Theses (A&A)

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