UV pumping of hyperfine transitions in the light elements, with application to 21-cm hydrogen and 92-cm deuterium lines from the early universe

Abstract

We present new analytic calculations of the coupling between ultraviolet resonance photons and the population of the hyperfine states in the light elements (H, D, He3+) which include several previously neglected physical processes. Among these are the backreaction of resonant scattering on the pumping radiation, the scattering of Ly_beta photons and the effect of local departure from pure Hubble flow. The application of the new treatment to the redshifted hydrogen 21 and deuterium 92 cm lines from the high-redshift universe results in an amplitude correction of up to an order of magnitude. We further show that the standard assumption that ultraviolet pumping drives the spin temperature towards the kinetic temperature does not hold for deuterium, whose spin temperature is generally negative.

7 pages, 6 figures, submitted to ApJ

References in corpus (14)

• 21-cm Tomography of the Intergalactic Medium at High Redshift
• 21 Centimeter Fluctuations from Cosmic Gas at High Redshifts
• Wouthuysen-Field coupling strength and application to high-redshift 21 cm radiation
• The Spin-Kinetic Temperature Coupling and the Heating Rate due to Lyman Alpha Scattering before Reionization: Predictions for 21cm Emission and Absorption
• Probing Beyond the Epoch of Hydrogen Reionization with 21 Centimeter Radiation
• Radio Signatures of HI at High Redshift: Mapping the End of the ``Dark Ages''
• Observing the Reionization Epoch Through 21 Centimeter Radiation
• The Time Development of a Resonance Line in the Expanding Universe
• The Cosmic Reionization History as Revealed by the CMB Doppler--21-cm Correlation
• Reionization History from Coupled CMB/21cm Line Data
• Improved Fokker-Planck Equation for Resonance Line Scattering
• Measuring the Primordial Deuterium Abundance During the Cosmic Dark Ages
• Polarization of 21cm Radiation from the Epoch of Reionization
• Cross-Correlation Studies with CMB Polarization Maps

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