Gamma-ray emission from proton–proton interactions in hot accretion flows

Abstract. Astrospheres and wind bubbles of massive stars are believed to be sources of cosmic rays with energies E &lesssim; 1 TeV. These particles are not directly detectable, but their impact on surrounding matter, in particular ionisation of atomic and molecular hydrogen, can lead to observable signatures. A correlation study of both gamma ray emission, induced by proton-proton interactions of cosmic ray protons with kinetic energies Ep ≥ 280 MeV with ambient hydrogen, and ionisation induced by cosmic ray protons of kinetic energies Ep < 280 MeV can be performed in order to study potential sources of (sub)TeV cosmic rays.

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A Combined Model for the X‐Ray to Gamma‐Ray Emission of Cygnus X‐1

The Astrophysical Journal ◽

10.1086/305889 ◽

1998 ◽

Vol 502 (1) ◽

pp. 428-436 ◽

Cited By ~ 3

Author(s):

Igor V. Moskalenko ◽

Werner Collmar ◽

Volker Schonfelder

Keyword(s):

Gamma Ray ◽

Combined Model ◽

X Ray ◽

Gamma Ray Emission

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Standardization of 223Ra by live-time anticoincidence counting and gamma-ray emission determination

Applied Radiation and Isotopes ◽

10.1016/j.apradiso.2020.109559 ◽

2021 ◽

pp. 109559

Author(s):

R.F.P. Simões ◽

C.J. da Silva ◽

R.L. da Silva ◽

L.V. de Sá ◽

R. Poledna ◽

...

Keyword(s):

Gamma Ray ◽

Gamma Ray Emission ◽

Anticoincidence Counting

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Radio jets and gamma-ray emission in radio-silent narrow-line Seyfert 1 galaxies

Astronomy and Astrophysics ◽

10.1051/0004-6361/201833378 ◽

2018 ◽

Vol 614 ◽

pp. L1 ◽

Cited By ~ 20

Author(s):

A. Lähteenmäki ◽

E. Järvelä ◽

V. Ramakrishnan ◽

M. Tornikoski ◽

J. Tammi ◽

...

Keyword(s):

Gamma Rays ◽

Supernova Remnants ◽

Gamma Ray ◽

Spiral Galaxies ◽

Narrow Line ◽

Radio Jets ◽

Relativistic Jet ◽

Gamma Ray Emission

We have detected six narrow-line Seyfert 1 (NLS1) galaxies at 37 GHz that were previously classified as radio silent and two that were classified as radio quiet. These detections reveal the presumption that NLS1 galaxies labelled radio quiet or radio silent and hosted by spiral galaxies are unable to launch jets to be incorrect. The detections are a plausible indicator of the presence of a powerful, most likely relativistic jet because this intensity of emission at 37 GHz cannot be explained by, for example, radiation from supernova remnants. Additionally, one of the detected NLS1 galaxies is a newly discovered source of gamma rays and three others are candidates for future detections.

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