The Theory And Simulation Of The 21-Cm Background From The Epoch Of Reionization

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dc.contributor.utaustinauthorShapiro, Paul R.en
dc.creatorShapiro, P. R.en
dc.creatorIliev, I. T.en
dc.creatorMellerna, G.en
dc.creatorPen, U. L.en
dc.creatorMerz, H.en
dc.date.accessioned2015-04-16T14:48:04Zen
dc.date.available2015-04-16T14:48:04Zen
dc.date.issued2008-08en
dc.description.abstractThe redshifted 21-cm line of distant neutral H atoms provides a probe of the cosmic >dark ages> and the epoch of reionization (>EOR>) which ended them, within die first billion years of cosmic time. The radio continuum produced by this redshifted line can be seen in absorption or emission against die cosmic microwave background (>CMB>) at meterwaves, yielding information about tire thermal and ionization history of the universe and the primordial density perturbation spectrum that led to galaxy and large-scale structure formation. Observing this 21-cm background is a great challenge,as it is necessary to detect a diffuse signal at a brightness temperature that differs from that of die CM B at millikelvin levels and distinguish this from foreground continuum sources. A new generation of low-frequency radio arrays is currently under development to search for this background. Accurate theoretical predictions of tire spectrum and anisotropy of this back-ground, necessary to guide and interpret future observations, are also quite challenging. Toward this end, it is necessary to model the inhomogeneous reionization of the intergalactic medium and determine the spin temperature of the 21-cm transition and its variations in time and space as it decouples from the temperature of the CMB, In my talk, I summarized some of the theoretical progress in this area. Here, I will focus on just a few of the predictions for the 21-cm background from the EOR, based on our newest, large-scale simulations of patchy reionization. These simulations are the first with enough N-body particles (from 5 to 29 billion) and radiative transfer rays to resolve the formation of and trace the ionizing radiation front each of the millions of dwarf galaxies believed responsible for reionization, down to 10(8) M-circle dot, in a cubic volume large enough (90 and 163 comoving Mpc on a side) to make meaningful statistical predictions of the fluctuating 21-cm background.en
dc.description.departmentAstronomyen
dc.identifier.citationPaul R. Shapiro, Ilian T. Iliev, Garrelt Mellema, Ue‐Li Pen, and Hugh Merz. AIP Conference Proceedings 1035, 68 (Aug., 2008); doi: 10.1063/1.2973617en
dc.identifier.doi10.1063/1.2973617en
dc.identifier.issn0094-243Xen
dc.identifier.issn978-0-7354-0558-5en
dc.identifier.urihttp://hdl.handle.net/2152/29457en
dc.language.isoEnglishen
dc.relation.ispartofserialEvolution of Galaxies through the Neutral Hydrogen Windowen_US
dc.rightsAdministrative deposit of works to UT Digital Repository: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en
dc.subjectcosmology : theoryen
dc.subjectdiffuse radiationen
dc.subjectlarge-scale structure ofen
dc.subjectuniverseen
dc.subjecthigh-redshiften
dc.subjectgalaxies : formationen
dc.subjectintergalactic mediumen
dc.subjectradiative transferen
dc.subjectmethods : numericalen
dc.subjectradiative-transfer simulationsen
dc.subjectcosmic reionizationen
dc.subjectlarge scalesen
dc.subjectuniverseen
dc.subjectcodesen
dc.subjectastronomy & astrophysicsen
dc.titleThe Theory And Simulation Of The 21-Cm Background From The Epoch Of Reionizationen
dc.typeArticleen

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