SPI observations of positron annihilation radiation from the 4th galactic quadrant: sky distribution
G. Weidenspointner, V. Lonjou, J. Knoedlseder, P. Jean, M. Allain, P., von Ballmoos, M.J. Harris, G.K. Skinner, G. Vedrenne, B.J. Teegarden, N., Gehrels, N. Guessoum, V. Schoenfelder, C. Chapuis, Ph. Durouchoux, E. Cisana, and M. Valsesia
TL;DR
This paper analyzes the distribution of positron annihilation radiation in the 4th Galactic quadrant using INTEGRAL's SPI spectrometer, providing insights into the sky distribution of 511 keV emission.
Contribution
It presents the analysis methods and current constraints on the Galactic bulge emission and bulge-to-disk ratio of positron annihilation radiation.
Findings
Constraints on the Galactic bulge emission are established.
Limits on the bulge-to-disk ratio are provided.
Sky distribution of 511 keV line emission is characterized.
Abstract
During its first year in orbit the INTEGRAL observatory performed deep exposures of the Galactic Center region and scanning observations of the Galactic plane. We report on the status of our analysis of the positron annihilation radiation from the 4th Galactic quadrant with the spectrometer SPI, focusing on the sky distribution of the 511 keV line emission. The analysis methods are described; current constraints and limits on the Galactic bulge emission and the bulge-to-disk ratio are presented.
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Taxonomy
TopicsDark Matter and Cosmic Phenomena · Photocathodes and Microchannel Plates · Atomic and Molecular Physics