Gamma-ray pulses from pulsar winds: Exploring the near wind region

2012 ◽  
Author(s):  
Ioanna Arka ◽  
Guillaume Dubus
Keyword(s):  
Gamma Ray ◽  
Wind Region ◽  
Pulsar Winds

Cosmic-Ray Positrons Produced by Pulsar Winds from Mature Gamma-Ray Pulsars

2001 ◽  
Vol 18 (5) ◽  
pp. 701-704 ◽  
Author(s):  
Zhang Li ◽  
K. S. Cheng ◽  
Mei Dong-Cheng
Keyword(s):  
Gamma Ray ◽  
Cosmic Ray ◽  
Pulsar Winds

scholarly journals ALMA observations of PSR B1259−63/LS 2883 in an inactive period: Variable circumstellar disk?

2020 ◽  
Vol 72 (5) ◽  
Author(s):  
Yutaka Fujita ◽  
Hiroshi Nagai ◽  
Takuya Akahori ◽  
Akiko Kawachi ◽  
Atsuo T Okazaki
Keyword(s):  
Binary System ◽  
Massive Star ◽  
Gamma Ray ◽  
Thermal Emission ◽  
Radio Continuum ◽  
Continuum Emission ◽  
Circumstellar Disk ◽  
Inactive Period ◽  
Period Variable ◽  
Pulsar Winds

Abstract We report Atacama Large Millimeter/submillimeter Array (ALMA) observations of the gamma-ray binary system containing the pulsar PSR B1259−63 orbiting around a massive star LS 2883 in an inactive period between the 2017 and 2021 periastron passages. We detected radio continuum emission from the binary system at 97 GHz (Band 3) and 343 GHz (Band 7). Compared with our previous ALMA observations performed soon after the 2017 periastron passage, the fluxes have decreased by a factor of six at 97 GHz and of two at 343 GHz. The flux at 343 GHz is large relative to that at 97 GHz and appears to be thermal emission from the circumstellar disk around LS 2883. The decrease of the 343 GHz flux may indicate that the disk has expanded and become partially optically thin since the disk is no longer affected by pulsar winds. The flux at 97 GHz is consistent with that expected from the pulsed emission from the pulsar, which indicates that the unpulsed emission that had been produced through pulsar-disk or pulsar-stellar wind interaction has disappeared. The image of the system is consistent with a point source and shows no sign of ejecta.

On the possible gamma-ray source in Cygnus

1967 ◽  
Vol 31 ◽  
pp. 469-471
Author(s):  
J. G. Duthie ◽  
M. P. Savedoff ◽  
R. Cobb
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Right Ascension

A source of gamma rays has been found at right ascension 20h15m, declination +35°, with an uncertainty of 6° in each coordinate. Its flux is (1·5 ± 0·8) x 10-4photons cm-2sec-1at 100 MeV. Possible identifications are reviewed, but no conclusion is reached. The mechanism producing the radiation is also uncertain.

Solar Flare Energetic Neutral Emission Measurements in the Project Coronas-I

1994 ◽  
Vol 144 ◽  
pp. 635-639
Author(s):  
J. Baláž ◽  
A. V. Dmitriev ◽  
M. A. Kovalevskaya ◽  
K. Kudela ◽  
S. N. Kuznetsov ◽  
...  
Keyword(s):  
Solar Flare ◽  
Energy Range ◽  
Gamma Rays ◽  
Pulse Shape ◽  
Gamma Ray ◽  
Pulse Shape Discrimination ◽  
Shape Discrimination ◽  
Solar Neutron ◽  
Low Altitude

AbstractThe experiment SONG (SOlar Neutron and Gamma rays) for the low altitude satellite CORONAS-I is described. The instrument is capable to provide gamma-ray line and continuum detection in the energy range 0.1 – 100 MeV as well as detection of neutrons with energies above 30 MeV. As a by-product, the electrons in the range 11 – 108 MeV will be measured too. The pulse shape discrimination technique (PSD) is used.

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