No indication of excess MeV gamma radiation from the Crab Nebula

Nature ◽  
1975 ◽  
Vol 257 (5525) ◽  
pp. 375-376 ◽  
Author(s):  
V. SCHÖNFELDER ◽  
G. LICHTI ◽  
C. MOYANO
Keyword(s):  
Gamma Radiation ◽  
Crab Nebula ◽  
The Crab Nebula

Measurements of low-energy gamma radiation from the Crab Nebula and from pulsar NP 0532

1975 ◽  
Vol 202 ◽  
pp. 502 ◽  
Author(s):  
G. D. Walraven ◽  
R. D. Hall ◽  
C. A. Meegan ◽  
P. L. Coleman ◽  
D. H. Shelton ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Crab Nebula ◽  
Low Energy ◽  
Energy Gamma ◽  
The Crab Nebula

Observation of Gamma Radiation from the Crab Nebula

1968 ◽  
Vol 151 ◽  
pp. L9 ◽  
Author(s):  
R. C. Haymes ◽  
D. V. Ellis ◽  
G. J. Fishman ◽  
J. D. Kurfess ◽  
W. H. Tucker
Keyword(s):  
Gamma Radiation ◽  
Crab Nebula ◽  
The Crab Nebula

Search for cosmic gamma radiation with a vidicon spark chamber

1968 ◽  
Vol 46 (10) ◽  
pp. S427-S432 ◽  
Author(s):  
G. G. Fazio ◽  
H. F. Helmken ◽  
S. J. Cavrak Jr. ◽  
D. R. Hearn
Keyword(s):  
Energy Spectrum ◽  
Solar Flare ◽  
Gamma Radiation ◽  
High Altitude ◽  
Gamma Ray ◽  
Crab Nebula ◽  
Upper Limit ◽  
Flux Formula ◽  
The Crab Nebula

A vidicon spark chamber flown in a high-altitude balloon has been used to search for primary gamma radiation (E > 100 MeV). No celestial gamma-ray source was detected. The new upper limit to the flux from the Crab nebula was found to be 3.1 × 10−5 cm−2 s−1, and the flux from the quiet sun to be [Formula: see text]. A solar flare (type 2) also occurred during the flight, of flux [Formula: see text], which is also a new upper limit. The gamma-ray background flux and energy spectrum at 4 g cm−2 altitude were measured.

Detection of Pulsed Gamma Radiation from the Crab Nebula

1971 ◽  
Vol 232 (31) ◽  
pp. 99-101 ◽  
Author(s):  
R. BROWNING ◽  
D. RAMSDEN ◽  
P. J. WRIGHT
Keyword(s):  
Gamma Radiation ◽  
Crab Nebula ◽  
The Crab Nebula

scholarly journals High-Energy Discrete Sources

1973 ◽  
Vol 55 ◽  
pp. 303-323 ◽  
Author(s):  
G. G. Fazio
Keyword(s):  
Gamma Radiation ◽  
Gamma Ray ◽  
Galactic Center ◽  
Galactic Plane ◽  
Crab Nebula ◽  
High Energy ◽  
Continuous Emission ◽  
X Ray ◽  
The Crab Nebula ◽  
Variable Radio

The origin of the gamma-radiation from the galactic plane and the region near the galactic center is still uncertain. However, during this meeting, several groups reported evidence for discrete sources of cosmic gamma-rays. Most of the sources are located near the galactic plane, and some are associated with X-ray sources. The galactic gamma-radiation may be due to these previously unresolved sources. Other sources detected may be associated with variable radio galaxies.The Crab Nebula still remains the most investigated source at gamma-ray energies. Pulsed emission from NP0532 was detected in the 10 to 30 MeV region, but no continuous emission was observed. At the highest energies, pulsed emission was reported at ∼1012 eV. Continuous emission from the Crab Nebula was observed at ∼1011 eV; the radiation may be time variable.The recent gamma-ray experiments on Apollo 15 and 16 and the ESRO satellite TD-1 are described, as well as future experiments on the satellites SAS-B, COS-B, and HEAO-B.

scholarly journals Gamma radiation from the Crab Nebula above 35 MeV

Nature ◽  
1974 ◽  
Vol 251 (5474) ◽  
pp. 397-399 ◽  
Author(s):  
D. A. KNIFFEN ◽  
R. C. HARTMAN ◽  
D. J. THOMPSON ◽  
G. F. BIGNAMI ◽  
C. E. FICHTEL ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Crab Nebula ◽  
The Crab Nebula

Observation of Polarization for the Crab Nebula with PHENEX Polarimeter

2010 ◽  
Vol 8 (ists27) ◽  
pp. Tm_35-Tm_40 ◽  
Author(s):  
Yuji KISHIMOTO ◽  
Shuichi GUNJI ◽  
Yushi ISHIKAWA ◽  
Makoto TAKADA ◽  
Tatehiro MIHARA ◽  
...  
Keyword(s):  
Crab Nebula ◽  
The Crab Nebula

A Model for the Moving “Wisps” in the Crab Nebula

1999 ◽  
Vol 512 (2) ◽  
pp. 755-760 ◽  
Author(s):  
Mitchell C. Begelman
Keyword(s):  
Crab Nebula ◽  
The Crab Nebula

scholarly journals Strong Waves from Pulsars and Morphologies in SNRs

1983 ◽  
Vol 101 ◽  
pp. 499-501
Author(s):  
Gregory Benford ◽  
Attilio Ferrari ◽  
Silvano Massaglia
Keyword(s):  
Large Amplitude ◽  
Crab Nebula ◽  
Surrounding Medium ◽  
Low Frequency ◽  
Optical Emission ◽  
Amplitude Wave ◽  
Surface Magnetic Field ◽  
Plasma Absorption ◽  
The Crab Nebula ◽  
Large Amplitude Wave

Canonical models for pulsars predict the emission of low–frequency waves of large amplitudes, produced by the rotation of a neutron star possessing a strong surface magnetic field. Pacini (1968) proposed this as the basic drain which yields to the pulsar slowing–down rate. The main relevance of the large amplitude wave (LAW) is the energetic link it provides between the pulsar and the surrounding medium. This role has been differently emphasized (Rees and Gunn, 1974; Ferrari, 1974), referring to absorption effects by relativistic particle acceleration and thermal heating, either close to the pulsar magnetosphere or in the nebula. It has been analyzed in the special case of the Crab Nebula, where observations are especially rich (Rees, 1971). As the Crab Nebula displays a cavity around the pulsar of dimension ∼1017cm, the function of the wave in sweeping dense gas away from the circumpulsar region is widely accepted. Absorption probably occurs at the inner edges of the nebula; i.e., where the wave pressure and the nebular pressure come into balance. Ferrari (1974) interpreted the wisps of the Crab Nebula as the region where plasma absorption occurs, damping the large amplitude wave and driving “parametric” plasma turbulence, thus trasferring energy to optical radiation powering the nebula. The mechanism has been extended to interpret the specific features of the “wisps” emission (Benford et al., 1978). Possibly the wave fills the nebula completely, permeating the space outside filaments with electromagnetic energy, continuously accelerating electrons for the extended radio and optical emission (Rees, 1971).

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