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Diffuse Galactic gamma-ray emission with HESS
Univ Hamburg, Inst Expt Phys, D-22761 Hamburg, Germany.
Max Planck Inst Kernphys, D-69029 Heidelberg, Germany.
Max Planck Inst Kernphys, D-69029 Heidelberg, Germany.
Natl Acad Sci Republ Armenia, Yerevan 0019, Armenia.
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2014 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 90, no 12, p. Article ID: 122007-Article in journal (Refereed) Published
Abstract [en]

Diffuse gamma-ray emission is the most prominent observable signature of celestial cosmic-ray interactions at high energies. While already being investigated at GeVenergies over several decades, assessments of diffuse gamma-ray emission at TeVenergies remain sparse. After completion of the systematic survey of the inner Galaxy, the H.E.S.S. experiment is in a prime position to observe large-scale diffuse emission at TeVenergies. Data of the H.E.S.S. Galactic Plane Survey are investigated in regions off known gamma-ray sources. Corresponding gamma-ray flux measurements were made over an extensive grid of celestial locations. Longitudinal and latitudinal profiles of the observed gamma-ray fluxes show characteristic excess emission not attributable to known gamma-ray sources. For the first time large-scale gamma-ray emission along the Galactic plane using imaging atmospheric Cherenkov telescopes has been observed. While the background subtraction technique limits the ability to recover modest variation on the scale of the H.E.S.S. field of view or larger, which is characteristic of the inverse Compton scatter-induced Galactic diffuse emission, contributions of neutral pion decay as well as emission from unresolved gamma-ray sources can be recovered in the observed signal to a large fraction. Calculations show that the minimum gamma-ray emission from pi(0) decay represents a significant contribution to the total signal. This detection is interpreted as a mix of diffuse Galactic gamma-ray emission and unresolved sources.

Place, publisher, year, edition, pages
2014. Vol. 90, no 12, p. Article ID: 122007-
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-39562DOI: 10.1103/PhysRevD.90.122007ISI: 000347194400004Scopus ID: 2-s2.0-84920112052OAI: oai:DiVA.org:lnu-39562DiVA, id: diva2:784476
Available from: 2015-01-29 Created: 2015-01-29 Last updated: 2017-12-05Bibliographically approved

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Becherini, YvonnePunch, Michael

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