scholarly journals TeV γ-ray source MGRO J2019+37 : PWN or SNR?

2013 ◽  
Vol 9 (S296) ◽  
pp. 300-304
Author(s):  
Lab Saha ◽  
Pijushpani Bhattacharjee
Keyword(s):  
Crab Nebula ◽  
High Energy ◽  
Emission Region ◽  
Pulsar Wind Nebulae ◽  
Upper Limit ◽  
Multi Wavelength ◽  
Very High Energy ◽  
Hadronic Energy ◽  
Γ Ray ◽  
Very High

AbstractMilagro has recently reported an extended TeV γ-ray source MGRO J2019+37 in the Cygnus region. It is the second brightest TeV source after Crab nebula in their source catalogue. No confirmed counterparts of this source are known although possible associations with several known sources have been suggested. We study leptonic as well as hadronic models of TeV emission within the context of Pulsar Wind Nebulae (PWN) and Supernova Remnant (SNR) type sources, using constraints from multi-wavelength data from observations made on sources around MGRO J2019+37. These include radio upper limit given by GMRT, GeV observations by Fermi-LAT, EGRET and AGILE and very high energy data taken from Milagro. We find that, within the PWN scenario, while both leptonic as well as hadronic models can explain the TeV flux from this source, the GMRT upper limit imposes a stringent upper limit on the size of the emission region in the case of leptonic model. In the SNR scenario, on the other hand, a purely leptonic origin of TeV flux is inconsistent with the GMRT upper limit. At the same time, a dominantly hadronic origin of the TeV flux is consistent with all observations, and the required hadronic energy budget is comparable to that of typical supernovae explosions.

scholarly journals Very high energy γ-ray emission from two blazars of unknown redshift and upper limits on their distance

2020 ◽  
Vol 494 (4) ◽  
pp. 5590-5602
Author(s):  
H Abdalla ◽  
R Adam ◽  
F Aharonian ◽  
F Ait Benkhali ◽  
E O Angüner ◽  
...  
Keyword(s):  
Confidence Level ◽  
High Energy ◽  
Bl Lac Objects ◽  
Upper Limit ◽  
Upper Limits ◽  
Bl Lac ◽  
Very High Energy ◽  
Stereoscopic System ◽  
Γ Ray ◽  
Very High

ABSTRACT We report on the detection of very high energy (VHE; E > 100 GeV) γ-ray emission from the BL Lac objects KUV 00311−1938 and PKS 1440−389 with the High Energy Stereoscopic System (H.E.S.S.). H.E.S.S. observations were accompanied or preceded by multiwavelength observations with Fermi/LAT, XRT and UVOT onboard the Swift satellite, and ATOM. Based on an extrapolation of the Fermi/LAT spectrum towards the VHE γ-ray regime, we deduce a 95 per cent confidence level upper limit on the unknown redshift of KUV 00311−1938 of $z$ < 0.98 and of PKS 1440−389 of $z$ < 0.53. When combined with previous spectroscopy results, the redshift of KUV 00311−1938 is constrained to 0.51 ≤ $z$ < 0.98 and of PKS 1440−389 to 0.14 ⪅ $z$ < 0.53.

scholarly journals A THREE-YEAR MULTI-WAVELENGTH STUDY OF THE VERY-HIGH-ENERGY γ-RAY BLAZAR 1ES 0229+200

2014 ◽  
Vol 782 (1) ◽  
pp. 13 ◽  
Author(s):  
E. Aliu ◽  
S. Archambault ◽  
T. Arlen ◽  
T. Aune ◽  
B. Behera ◽  
...  
Keyword(s):  
High Energy ◽  
Multi Wavelength ◽  
Very High Energy ◽  
Γ Ray ◽  
Very High

scholarly journals Very high-energy γ-ray observations of the Crab nebula and other potential sources with the GRAAL experiment

2002 ◽  
Vol 17 (3) ◽  
pp. 293-318 ◽  
Author(s):  
F. Arqueros ◽  
J. Ballestrin ◽  
M. Berenguel ◽  
D.M. Borque ◽  
E.F. Camacho ◽  
...  
Keyword(s):  
Crab Nebula ◽  
High Energy ◽  
Potential Sources ◽  
Very High Energy ◽  
Γ Ray ◽  
The Crab Nebula ◽  
Very High

scholarly journals THE 2010 VERY HIGH ENERGY γ-RAY FLARE AND 10 YEARS OF MULTI-WAVELENGTH OBSERVATIONS OF M 87

2012 ◽  
Vol 746 (2) ◽  
pp. 151 ◽  
Author(s):  
A. Abramowski ◽  
F. Acero ◽  
F. Aharonian ◽  
A. G. Akhperjanian ◽  
G. Anton ◽  
...  
Keyword(s):  
High Energy ◽  
Multi Wavelength ◽  
Very High Energy ◽  
Γ Ray ◽  
Very High

scholarly journals HESS upper limit on the very high energy γ-ray emission from the globular cluster 47 Tucanae

2009 ◽  
Vol 499 (1) ◽  
pp. 273-277 ◽  
Author(s):  
F. Aharonian ◽  
A. G. Akhperjanian ◽  
G. Anton ◽  
U. Barres de Almeida ◽  
A. R. Bazer-Bachi ◽  
...  
Keyword(s):  
Globular Cluster ◽  
High Energy ◽  
Upper Limit ◽  
Very High Energy ◽  
Γ Ray ◽  
Very High

scholarly journals Fermi LARGE AREA TELESCOPE DETECTION OF TWO VERY-HIGH-ENERGY ( E > 100 GeV) γ-RAY PHOTONS FROM THE z = 1.1 BLAZAR PKS 0426–380

2013 ◽  
Vol 777 (1) ◽  
pp. L18 ◽  
Author(s):  
Y. T. Tanaka ◽  
C. C. Cheung ◽  
Y. Inoue ◽  
Ł. Stawarz ◽  
M. Ajello ◽  
...  
Keyword(s):  
High Energy ◽  
Large Area ◽  
Very High Energy ◽  
Γ Ray ◽  
Very High

scholarly journals A Very High Energy γ-Ray Survey toward the Cygnus Region of the Galaxy

2018 ◽  
Vol 861 (2) ◽  
pp. 134 ◽  
Author(s):  
A. U. Abeysekara ◽  
A. Archer ◽  
T. Aune ◽  
W. Benbow ◽  
R. Bird ◽  
...  
Keyword(s):  
High Energy ◽  
The Galaxy ◽  
Very High Energy ◽  
Γ Ray ◽  
Very High

scholarly journals The Making of Catalogues of Very-High-Energy γ-ray Sources

Universe ◽  
2021 ◽  
Vol 7 (11) ◽  
pp. 421
Author(s):  
Mathieu de Naurois
Keyword(s):  
Galactic Plane ◽  
Population Studies ◽  
High Energy ◽  
Cherenkov Telescopes ◽  
Background Rejection ◽  
Fine Grained ◽  
Very High Energy ◽  
Advanced Analysis ◽  
Γ Ray ◽  
Very High

Thirty years after the discovery of the first very-high-energy γ-ray source by the Whipple telescope, the field experienced a revolution mainly driven by the third generation of imaging atmospheric Cherenkov telescopes (IACTs). The combined use of large mirrors and the invention of the imaging technique at the Whipple telescope, stereoscopic observations, developed by the HEGRA array and the fine-grained camera, pioneered by the CAT telescope, led to a jump by a factor of more than ten in sensitivity. The advent of advanced analysis techniques led to a vast improvement in background rejection, as well as in angular and energy resolutions. Recent instruments already have to deal with a very large amount of data (petabytes), containing a large number of sources often very extended (at least within the Galactic plane) and overlapping each other, and the situation will become even more dramatic with future instruments. The first large catalogues of sources have emerged during the last decade, which required numerous, dedicated observations and developments, but also made the first population studies possible. This paper is an attempt to summarize the evolution of the field towards the building up of the source catalogues, to describe the first population studies already made possible, and to give some perspectives in the context of the upcoming, new generation of instruments.

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