A study of the intrinsic $\gamma$-ray emission of Fermi/LAT-detected BL Lacs

2021 ◽  
Vol 366 (11) ◽  
Author(s):  
X. H. Ye ◽  
X. T. Zeng ◽  
W. X. Yang ◽  
H. S. Huang ◽  
Y. H. Xuan ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Emission ◽  
Bl Lacs

scholarly journals Radio and gamma-ray emission in faint BL Lacs

2016 ◽  
Author(s):  
Elisabetta Liuzzo ◽  
Biagina Boccardi ◽  
Marcello Giroletti ◽  
Gabriele Giovannini
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Emission ◽  
Bl Lacs

scholarly journals Radio and Gamma-ray emission in nearby BL Lacs

2013 ◽  
Vol 9 (S304) ◽  
pp. 200-203 ◽  
Author(s):  
G. Giovannini ◽  
E. Liuzzo ◽  
B. Boccardi ◽  
M. Giroletti
Keyword(s):  
Active Galactic Nuclei ◽  
Gamma Ray ◽  
Galactic Nuclei ◽  
Scale Structure ◽  
Bl Lac Objects ◽  
Long Baseline ◽  
Γ Ray ◽  
Gamma Ray Emission ◽  
Very Long Baseline Array ◽  
Bl Lacs

AbstractThe advent of Fermi is changing our understanding on the radio and γ-ray emission in active galactic nuclei. Unlike pre-Fermi ideas, BL Lac objects are found to be the most abundant emitters in the γ-ray band. However, since they are relatively weak radio sources, most of their parsec-scale structure and their multifrequency properties are poorly understood and/or have not been investigated in a systematic fashion. Here we are analyzing the radio and γ-ray emission properties of a sample of 42 BL Lacs selected with no constraint on their radio and γ-ray emission. Thanks to new Very Long Baseline Array observations at 8 and 15 GHz for the whole sample, we discuss their parsec-scale structure. Parsec-scale radio emission is observed in the majority of the sources at both frequencies. The comparison between our results in radio and gamma-ray bands points out the presence of a large number of faint BL Lacs showing “non-classical” properties such as low source compactness, low core dominance, no gamma-ray emission.

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

Hadronic Contributions for TeV Gamma‐Ray Emission from Young Supernova Remnants

2007 ◽  
Vol 666 (1) ◽  
pp. 247-260 ◽  
Author(s):  
L. Zhang ◽  
J. Fang
Keyword(s):  
Supernova Remnants ◽  
Gamma Ray ◽  
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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