A Maximum Entropy Map of the 511 keV Positron Annihilation Line Emission Distribution near the Galactic Center

Details A Maximum Entropy Map of the 511 keV Positron Annihilation Line Emission Distribution near the Galactic Center A Maximum Entropy Map of the 511 keV Positron Annihilation Line Emission Distribution near the Galactic Center

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...481l..43c&link_type=abstract

Astrophysical Journal Letters v.481, p.L43

Astronomy and Astrophysics

Astronomy

28

Galaxies: The Galaxy, Gamma Rays: General

Scientific paper

We have applied the maximum entropy method to a large data set based on Compton Gamma Ray Observatory (CGRO)/OSSE, Solar Maximum Mission, Transient Gamma-Ray Spectrometer, Gamma-Ray Imaging Spectrometer, HEXAGONE, and FIGARO observational results of the Galactic center 511 keV radiation in order to produce a map of the 511 keV line emission. This map suggests two components: a central bulge with a flux of 5.7 +/- 0.29 x 10-4 photons cm-2 s-1 and a Galactic plane (GP) component with a flux of 2.2 +/- 0.4 x 10-4 photons cm-2 s-1. The central bulge is located at l = -0.dg47 +/- 0.dg24, b = 0.dg1 +/- 0.dg18, and FWHM = 5.dg28 +/- 0.dg48. We note that the position of the GP component coincides with a strong hot spot in the COMPTEL map of 1.8 MeV 26Al line emission. A comparison between CGRO/OSSE and other instruments with larger field of view suggests an extended diffuse 511 keV emission. An interesting hot spot at l = -4 deg, b = 7 deg with a flux of ~2 x 10-4 photons cm-2 s-1 is shown on our map. A bootstrap test indicates that the significance level of this feature is 3.5 sigma .

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