Search for PeV Gamma-Ray Emission from the Southern Hemisphere with 5 Years of Data from the IceCube Observatory - INSPIRE

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Search for PeV Gamma-Ray Emission from the Southern Hemisphere with 5 Years of Data from the IceCube Observatory

IceCube

Collaboration

Aug 26, 2019

22 pages

Published in:

Astrophys.J. 891 9

e-Print:

1908.09918 [astro-ph.HE]

DOI:

10.3847/1538-4357/ab6d67 (publication)

Experiments:

ICECUBE

View in:

ADS Abstract Service

reference search22 citations

Citations per year

Abstract: (arXiv)

The measurement of diffuse PeV gamma-ray emission from the Galactic plane would provide information about the energy spectrum and propagation of Galactic cosmic rays, and the detection of a point-like source of PeV gamma rays would be strong evidence for a Galactic source capable of accelerating cosmic rays up to at least a few PeV. This paper presents several un-binned maximum likelihood searches for PeV gamma rays in the Southern Hemisphere using 5 years of data from the IceTop air shower surface detector and the in-ice array of the IceCube Observatory. The combination of both detectors takes advantage of the low muon content and deep shower maximum of gamma-ray air showers, and provides excellent sensitivity to gamma rays between

\sim

0.6 PeV and 100 PeV. Our measurements of point-like and diffuse Galactic emission of PeV gamma rays are consistent with background, so we constrain the angle-integrated diffuse gamma-ray flux from the Galactic Plane at 2 PeV to

2.61 \times 10^{-19}

cm

^{-2}

s

^{-1}

TeV

^{-1}

at 90% confidence, assuming an E

^{-3}

spectrum, and we estimate 90% upper limits on point-like emission at 2 PeV between 10

^{-21}

- 10

^{-20}

cm

^{-2}

s

^{-1}

TeV

^{-1}

for an E

^{-2}

spectrum, depending on declination. Furthermore, we exclude unbroken power-law emission up to 2 PeV for several TeV gamma-ray sources observed by H.E.S.S., and calculate upper limits on the energy cutoffs of these sources at 90% confidence. We also find no PeV gamma rays correlated with neutrinos from IceCube's high-energy starting event sample. These are currently the strongest constraints on PeV gamma-ray emission.

Note:

22 pages, 16 figures

gamma ray: emission
gamma ray: energy spectrum
showers: atmosphere
gamma ray: flux
cosmic radiation: galaxy
IceCube: surface
detector: surface
observatory
air
statistical

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