Non-Blazar Gamma-Ray Variables in The Galactic Plane: A New Class of Gamma-Ray Sources

1998 ◽  
pp. 771-774
Author(s):  
Marco Tavani
Keyword(s):  
Gamma Ray ◽  
Galactic Plane ◽  
New Class

Non-Blazar Gamma-Ray Variables in the Galactic Plane: A New Class of Gamma-Ray Sources

1998 ◽  
Vol 11 (2) ◽  
pp. 771-774
Author(s):  
Marco Tavani
Keyword(s):  
Strong Evidence ◽  
Gamma Ray ◽  
Galactic Center ◽  
Galactic Plane ◽  
Time Variable ◽  
Radio Pulsars ◽  
X Ray ◽  
New Class ◽  
Gamma Ray Emission

AbstractWe discuss recent detections of time-variable gamma-ray sources near the Galactic plane. A new bright gamma-ray transient was detected by EGRET in June 1995 near the Galactic center (GRO J1838-04). Also one of the most interesting unidentified gamma-ray sources in the plane, 2CG 135+1, was recently shown to be variable. Both GRO J1838-04 and 2CG 135+1 share many characteristics: variability of the gamma-ray flux within days/weeks, occasional peak gamma-ray emission of comparable flux (˜ 4 x 10-6ph cm-2s-1), absence of radio-loud spectrally-flat AGNs or prominent radio pulsars within their error boxes, lack of strong X-ray and/or hard X-ray counterparts. These characteristics do not match those of either gamma-ray blazars or isolated pulsars. Therefore, GRO J1838-04 and 2CG 135+1 provide strong evidence for the existence of a new class of variable gamma-ray sources.

scholarly journals Neutrino Astronomy with IceCube

2016 ◽  
Vol 12 (S324) ◽  
pp. 322-329
Author(s):  
Kevin J. Meagher
Keyword(s):  
Real Time ◽  
Gamma Ray ◽  
Galactic Plane ◽  
Galactic Nuclei ◽  
High Energy ◽  
Glacial Ice ◽  
Astrophysical Neutrinos ◽  
Charged Secondary ◽  
Neutrino Astronomy ◽  
The Antarctic

AbstractThe IceCube Neutrino Observatory is a cubic kilometer neutrino telescope located at the Geographic South Pole. Cherenkov radiation emitted by charged secondary particles from neutrino interactions is observed by IceCube using an array of 5160 photomultiplier tubes embedded between a depth of 1.5 km to 2.5 km in the Antarctic glacial ice. The detection of astrophysical neutrinos is a primary goal of IceCube and has now been realized with the discovery of a diffuse, high-energy flux consisting of neutrino events from tens of TeV up to several PeV. Many analyses have been performed to identify the source of these neutrinos: correlations with active galactic nuclei, gamma-ray bursts, and the galactic plane. IceCube also conducts multi-messenger campaigns to alert other observatories of possible neutrino transients in real-time. However, the source of these neutrinos remains elusive as no corresponding electromagnetic counterparts have been identified. This proceeding will give an overview of the detection principles of IceCube, the properties of the observed astrophysical neutrinos, the search for corresponding sources (including real-time searches), and plans for a next-generation neutrino detector, IceCube–Gen2.

Population statistics study of radio and gamma-ray pulsars in the Galactic plane

2007 ◽  
pp. 245-251
Author(s):  
Peter L. Gonthier ◽  
Sarah A. Story ◽  
Brian D. Clow ◽  
Alice K. Harding
Keyword(s):  
Gamma Ray ◽  
Galactic Plane ◽  
Population Statistics

scholarly journals ChandraObservation of the Unidentified TeV Gamma‐Ray Source HESS J1303−631 in the Galactic Plane

2005 ◽  
Vol 629 (2) ◽  
pp. 1017-1020 ◽  
Author(s):  
R. Mukherjee ◽  
J. P. Halpern
Keyword(s):  
Gamma Ray ◽  
Galactic Plane

COMPTEL measurements of 1.809 MeV gamma-ray line emission from the Galactic plane

1993 ◽  
Author(s):  
R. Diehl ◽  
W. Collmar ◽  
G. Lichti ◽  
V. Schönfelder ◽  
A. Strong ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Galactic Plane ◽  
Line Emission

scholarly journals STUDY OF THE DIFFUSE GAMMA-RAY EMISSION FROM THE GALACTIC PLANE WITH ARGO-YBJ

2015 ◽  
Vol 806 (1) ◽  
pp. 20 ◽  
Author(s):  
B. Bartoli ◽  
P. Bernardini ◽  
X. J. Bi ◽  
P. Branchini ◽  
A. Budano ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Galactic Plane ◽  
Gamma Ray Emission

scholarly journals Using gamma ray monitoring to avoid missing the next Milky Way Type Ia supernova

2019 ◽  
Vol 486 (2) ◽  
pp. 2910-2918 ◽  
Author(s):  
Xilu Wang (王夕露) ◽  
Brian D Fields ◽  
Amy Yarleen Lien (連雅琳)
Keyword(s):  
Gamma Rays ◽  
Milky Way ◽  
Gamma Ray ◽  
Galactic Plane ◽  
Early Warning Systems ◽  
Light Curves ◽  
X Rays ◽  
Warning Systems ◽  
Type Ia Supernova ◽  
Type Ia

Abstract A Milky Way Type Ia supernova (SNIa) could be unidentified or even initially unnoticed, being dim in radio, X-rays, and neutrinos, and suffering large optical/IR extinction in the Galactic plane. But SNIa emit nuclear gamma-ray lines from 56Ni → 56Co → 56Fe radioactive decays. These lines fall within the Fermi/GBM energy range, and the 56Ni 158 keV line is detectable by Swift/BAT. Both instruments frequently monitor the Galactic plane, which is transparent to gamma rays. Thus GBM and BAT are ideal Galactic SNIa early warning systems. We simulate SNIa MeV light curves and spectra to show that GBM and BAT could confirm a Galactic SNIa explosion, followed by Swift localization and observation in X-rays and UVOIR band. The time of detection depends sensitively on the 56Ni distribution, and can be as early as a few days if ${\gtrsim } 10{{\ \rm per\ cent}}$ of the 56Ni is present in the surface as suggested by SN2014J gamma data.

scholarly journals Gamma-ray observations and the large scale structure of the galaxy

1979 ◽  
Vol 84 ◽  
pp. 125-130
Author(s):  
J. A. Paul
Keyword(s):  
Present Status ◽  
Large Scale ◽  
Gamma Ray ◽  
Galactic Plane ◽  
Large Scale Structure ◽  
Galactic Disc ◽  
Γ Radiation ◽  
Latitude Dependence ◽  
The Galaxy ◽  
Γ Ray

Within the last few years, γ-ray astronomy has shifted from the discovery phase to the exploratory phase, thanks to the SAS-2 and COS-B satellites. The strongest feature of the γ-ray sky is the overwhelming emission of the galactic disc; even the radiation observed away from the galactic plane appears to be predominantly galactic, on the basis of its latitude dependence (Fichtel et al., 1978). Nevertheless, extragalactic γ-ray astronomy is not hopeless: the γ-radiation of the nearby quasar 3C273 has been very recently detected (Swanenburg et al., 1978). A brief summary of the present status of the galactic γ-ray astronomy follows.

scholarly journals Very high energy gamma-ray observations of the Galactic Plane with the CANGAROO-III telescopes

2008 ◽  
Vol 30 (2) ◽  
pp. 47-53 ◽  
Author(s):  
M. Ohishi ◽  
M. Mori ◽  
Y. Adachi ◽  
A. Asahara ◽  
G.V. Bicknell ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Galactic Plane ◽  
High Energy ◽  
High Energy Gamma ◽  
Very High Energy ◽  
Energy Gamma ◽  
Very High

scholarly journals Gamma-ray emission in radio galaxies, from MeV to TeV

2018 ◽  
Vol 14 (S342) ◽  
pp. 158-166
Author(s):  
Eleonora Torresi
Keyword(s):  
Gamma Ray ◽  
Radio Galaxies ◽  
High Energy ◽  
Cherenkov Telescopes ◽  
New Class ◽  
Very High Energy ◽  
Structure Complexity ◽  
The Impact ◽  
Jet Structure ◽  
Very High

AbstractThanks to the Fermi λ-ray satellite and the current Imaging Atmospheric Cherenkov Telescopes, radio galaxies have arisen as a new class of high- and very-high energy emitters. The favourable orientation of their jets makes radio galaxies extremely relevant in addressing important issues such as: (i) revealing the jet structure complexity; (ii) localising the emitting region(s) of high- and very-high energy radiation; (iii) understanding the physical processes producing these photons. In this review the main results on the λ-ray emission studies of radio galaxies from the MeV to TeV regimes will be presented, and the impact of future Cherenkov Telescope Array observations will be discussed.

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