OSSE Observations of Gamma-Ray Emission from Centaurus A

1995 ◽  
Vol 449 ◽  
pp. 105 ◽  
Author(s):  
R. L. Kinzer ◽  
W. N. Johnson ◽  
C. D. Dermer ◽  
J. D. Kurfess ◽  
M. S. Strickman ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Emission ◽  
Centaurus A

Upper limits on TeV gamma-ray emission from Centaurus A, Vela X-1, Centaurus X-3, and Circinus X-1

1993 ◽  
Vol 405 ◽  
pp. 554 ◽  
Author(s):  
W. H. Allen ◽  
I. A. Bond ◽  
E. Budding ◽  
M. J. Conway ◽  
A. Daniel ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Upper Limits ◽  
Gamma Ray Emission ◽  
Centaurus A

scholarly journals ON THE GAMMA-RAY EMISSION FROM THE CORE AND RADIO LOBES OF THE RADIO GALAXY CENTAURUS A

2014 ◽  
Vol 28 ◽  
pp. 1460182
Author(s):  
NAREK SAHAKYAN ◽  
FRANK M. RIEGER ◽  
FELIX AHARONIAN ◽  
RUIZHI YANG ◽  
EMMA DE ONA-WILHELMI
Keyword(s):  
Power Law ◽  
Gamma Ray ◽  
Radio Galaxy ◽  
Spectral Energy Distribution ◽  
High Energy ◽  
Spectral Energy ◽  
Radio Image ◽  
The Core ◽  
Gamma Ray Emission ◽  
Centaurus A

We summarize recent results based on an analysis of Fermi-LAT data for the lobes and the core of the nearby radio galaxy Centaurus A (Cen A). In the case of the core, high-energy (HE; > 100 MeV) γ-rays up to 50 GeV have been detected with a detection significance of about 44σ. The average gamma-ray spectrum of the core reveals interesting evidence for a possible deviation from a simple power-law. A likelihood analysis with a broken power-law model shows that the photon index becomes substantially harder above Eb ≃ 4 GeV, changing from Γ1 = 2.74 ± 0.03 below to Γ2 = 2.09 ± 0.20 above. It seems possible that this hardening marks the contribution of an additional high-energy component beyond the common synchrotron-self Compton jet emission. In the case of the lobes, the high-energy gamma-ray emission extends up to 6 GeV, with a significance of more than 10 and 20 σ for the north and the south lobe, respectively. Based on a detailed spatial analysis and comparison with the associated radio lobes, a substantial extension of the HE γ-ray emission beyond the WMAP radio image for the northern lobe of Cen A is found. We provide a short discussion of the lobe's spectral energy distribution (SED) in the context of hadronic and time-dependent leptonic scenarios.

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

1998 ◽  
Vol 502 (1) ◽  
pp. 428-436 ◽  
Author(s):  
Igor V. Moskalenko ◽  
Werner Collmar ◽  
Volker Schonfelder
Keyword(s):  
Gamma Ray ◽  
Combined Model ◽  
X Ray ◽  
Gamma Ray Emission

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

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

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

2018 ◽  
Vol 614 ◽  
pp. L1 ◽  
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.

Formation of the pulsed TeV gamma-ray emission at the light cylinder

2017 ◽  
Author(s):  
S. V. Bogovalov ◽  
F. Aharonian ◽  
D. Khangulyan
Keyword(s):  
Gamma Ray ◽  
Light Cylinder ◽  
Gamma Ray Emission

Erratum: Study of gamma-ray emission by proton beam interaction with injected Boron atoms for future medical imaging applications

2017 ◽  
Vol 12 (04) ◽  
pp. E04001-E04001
Author(s):  
G Petringa ◽  
G.A.P Cirrone ◽  
C Caliri ◽  
G Cuttone ◽  
L Giuffrida ◽  
...  
Keyword(s):  
Medical Imaging ◽  
Proton Beam ◽  
Gamma Ray ◽  
Beam Interaction ◽  
Gamma Ray Emission

scholarly journals EPISODIC TRANSIENT GAMMA-RAY EMISSION FROM THE MICROQUASAR CYGNUS X-1

2010 ◽  
Vol 712 (1) ◽  
pp. L10-L15 ◽  
Author(s):  
S. Sabatini ◽  
M. Tavani ◽  
E. Striani ◽  
A. Bulgarelli ◽  
V. Vittorini ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Emission
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