Local burst model of CMB temperature fluctuations: luminescence in lines of primary para- and orthohelium

Abstract

We have considered the formation of the luminescent subordinate HeI lines by the absorption of continuum radiation from a source in the lines of the main HeI series in the expanding Universe. It is suggested that at some moment of time, corresponding to the redshift $z_0$, a burst of superequilibrium blackbody radiation with a temperature $T+\Delta T$ occurs. This radiation is partially absorbed at different $z<z_0$ in the lines of the main HeI series and then converted into the radiation of subordinate lines. If ${\nu }_{ij}$ is the laboratory frequency of the transition of some subordinate line originating at some $z$, then in the present time its frequency will be $\nu ={\nu }_{ij}/(1+z)$. For different $z$ (and, consequently, for different $\nu$), the quantum yield for the subordinate lines of para- and orthohelium - the number of photons emitted in the subordinate line, per one initial excited atom and line profiles are calculated. Different pumping channels were considered. Spatial and angular distributions of radiation intensity of luminescent lines for the spherically symmetric radiation sources are presented. It is shown that for sufficiently large $\Delta T/T$, the luminescent lines can be very noticeable in the spectrum of blackbody background radiation.

References in corpus (8)

• Planck 2015 results. XIII. Cosmological parameters
• How exactly did the Universe become neutral?
• The evolution of CMB spectral distortions in the early Universe
• Time-Dependent Corrections to the Ly-alpha Escape Probability During Cosmological Hydrogen Recombination
• Propagation of the burst of radiation in expanding and recombining Universe: Thomson scattering
• Spin-Statistic Selection Rules for Multiphoton Transitions: Application to Helium Atom
• Local bursts model of primordial CMB temperature fluctuations: scattering in hydrogen lines
• Local Bursts Model of CMB Temperature Fluctuations: Scattering in Resonance Lines of Primordial Hydrogen and Helium

Cited by in corpus (1)

• Radiative QED corrections to one-photon transition rates in hydrogen atom at finite temperatures