Spectral and spatial variations of the diffuse gamma-ray background in the vicinity of the Galactic plane and possible nature of the feature at 130 GeV

We study the properties of the diffuse gamma-ray background around the Galactic plane at energies 60 - 200 GeV. We find that the spectrum of this emission possesses spacial variations having significant features (excesses and dips) as compared to the average smooth (power law) component. The positio...

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Detalles Bibliográficos
Autores principales: Boyarsky, Alexey, Malyshev, Denys, Ruchayskiy, Oleg
Lenguaje:eng
Publicado: 2012
Materias:
Astrophysics and Astronomy
Acceso en línea:https://dx.doi.org/10.1016/j.dark.2013.04.001
http://cds.cern.ch/record/1450849
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author Boyarsky, Alexey
Malyshev, Denys
Ruchayskiy, Oleg
author_facet Boyarsky, Alexey
Malyshev, Denys
Ruchayskiy, Oleg
author_sort Boyarsky, Alexey
collection CERN
description We study the properties of the diffuse gamma-ray background around the Galactic plane at energies 60 - 200 GeV. We find that the spectrum of this emission possesses spacial variations having significant features (excesses and dips) as compared to the average smooth (power law) component. The positions and shapes of these spectral features change with direction on the sky. We therefore argue, that the spectral feature around 130 GeV, found in several regions around the Galactic Center and the Galactic plane in [1204.2797,1205.1045], can not be interpreted with confidence as a gamma-ray line, but may be a component of the diffuse background and can be of instrumental or astrophysical origin. Therefore, the dark matter origin of this spectral feature becomes dubious.
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institution Organización Europea para la Investigación Nuclear
language eng
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spelling cern-14508492019-09-30T06:29:59Zdoi:10.1016/j.dark.2013.04.001http://cds.cern.ch/record/1450849engBoyarsky, AlexeyMalyshev, DenysRuchayskiy, OlegSpectral and spatial variations of the diffuse gamma-ray background in the vicinity of the Galactic plane and possible nature of the feature at 130 GeVAstrophysics and AstronomyWe study the properties of the diffuse gamma-ray background around the Galactic plane at energies 60 - 200 GeV. We find that the spectrum of this emission possesses spacial variations having significant features (excesses and dips) as compared to the average smooth (power law) component. The positions and shapes of these spectral features change with direction on the sky. We therefore argue, that the spectral feature around 130 GeV, found in several regions around the Galactic Center and the Galactic plane in [1204.2797,1205.1045], can not be interpreted with confidence as a gamma-ray line, but may be a component of the diffuse background and can be of instrumental or astrophysical origin. Therefore, the dark matter origin of this spectral feature becomes dubious.We study the properties of the diffuse gamma-ray background around the Galactic plane at energies 20 -- 200 GeV. We find that the spectrum of this emission possesses significant spacial variations with respect to the average smooth component. The positions and shapes of these spectral features change with the direction on the sky. We therefore argue, that the spectral feature around 130 GeV, found in several regions around the Galactic Center and in the Galactic plane in [1203.1312, 1204.2797, 1205.1045, 1206.1616], can not be interpreted with confidence as a gamma-ray line, but may be a component of the diffuse background and can be of instrumental or astrophysical origin. Therefore, the dark matter origin of this spectral feature becomes dubious.We study the properties of the diffuse γ-ray background around the Galactic plane at energies 20–200 GeV. We find that the spectrum of this emission possesses significant spacial variations with respect to the average smooth component. The positions and shapes of these spectral features change with the direction on the sky. We therefore argue that the spectral feature around 130 GeV, found in several regions around the Galactic Center and in the Galactic plane in Bringmann et al. (2012) [ 1 ], Weniger (2012) [ 2 ], Tempel et al. (2012) [ 3 ], and Su and Finkbeiner (2012) [ 4 ], cannot be interpreted with confidence as a γ-ray line, but may be a component of the diffuse background and can be of instrumental or astrophysical origin. Therefore, the dark matter origin of this spectral feature becomes dubious.arXiv:1205.4700CERN-PH-TH-2012-141CERN-PH-TH-2012-141oai:cds.cern.ch:14508492012-05-22
spellingShingle Astrophysics and Astronomy
Boyarsky, Alexey
Malyshev, Denys
Ruchayskiy, Oleg
Spectral and spatial variations of the diffuse gamma-ray background in the vicinity of the Galactic plane and possible nature of the feature at 130 GeV
title Spectral and spatial variations of the diffuse gamma-ray background in the vicinity of the Galactic plane and possible nature of the feature at 130 GeV
title_full Spectral and spatial variations of the diffuse gamma-ray background in the vicinity of the Galactic plane and possible nature of the feature at 130 GeV
title_fullStr Spectral and spatial variations of the diffuse gamma-ray background in the vicinity of the Galactic plane and possible nature of the feature at 130 GeV
title_full_unstemmed Spectral and spatial variations of the diffuse gamma-ray background in the vicinity of the Galactic plane and possible nature of the feature at 130 GeV
title_short Spectral and spatial variations of the diffuse gamma-ray background in the vicinity of the Galactic plane and possible nature of the feature at 130 GeV
title_sort spectral and spatial variations of the diffuse gamma-ray background in the vicinity of the galactic plane and possible nature of the feature at 130 gev
topic Astrophysics and Astronomy
url https://dx.doi.org/10.1016/j.dark.2013.04.001
http://cds.cern.ch/record/1450849
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AT malyshevdenys spectralandspatialvariationsofthediffusegammaraybackgroundinthevicinityofthegalacticplaneandpossiblenatureofthefeatureat130gev
AT ruchayskiyoleg spectralandspatialvariationsofthediffusegammaraybackgroundinthevicinityofthegalacticplaneandpossiblenatureofthefeatureat130gev

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