A Maximum Entropy Map of the 511 [CLC]ke[/CLC]V Positron Annihilation Line Emission Distribution Near the Galactic Center
| Autor: | Marvin Leventhal, Alanna Connors, J. Tueller, W. R. Purcell, D. D. Dixon, R. L. Kinzer, J. G. Skibo, D. M. Smith, L. X. Cheng |
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| Rok vydání: | 1997 |
| Předmět: |
Physics
Spectrometer Astrophysics::High Energy Astrophysical Phenomena Galactic Center Gamma ray Imaging spectrometer Flux Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galactic plane Solar maximum Space and Planetary Science Astrophysics::Galaxy Astrophysics Line (formation) |
| Zdroj: | The Astrophysical Journal. 481:L43-L46 |
| ISSN: | 0004-637X |
| DOI: | 10.1086/310638 |
| Popis: | 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 × 10-4 photons cm-2 s-1 and a Galactic plane (GP) component with a flux of 2.2 ± 0.4 × 10-4 photons cm-2 s-1. The central bulge is located at l = -047 ± 024, b = 01 ± 018, and FWHM = 528 ± 048. We note that the position of the GP component coincides with a strong hot spot in the COMPTEL map of 1.8 MeV26Al 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°, b = 7° with a flux of ~2 × 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 σ. |
| Databáze: | OpenAIRE |
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