The Crab Nebula - High energy X-ray observation of a lunar occultation

1975 ◽  
Vol 201 ◽  
pp. L15 ◽  
Author(s):  
R. Staubert ◽  
E. Kendziorra ◽  
J. Truemper ◽  
C. Reppin ◽  
J. A. Hoffman ◽  
...  
Keyword(s):  
Crab Nebula ◽  
High Energy ◽  
X Ray ◽  
Lunar Occultation ◽  
The Crab Nebula

High-energy X-ray observations of a lunar occultation of the Crab Nebula

1975 ◽  
Vol 197 ◽  
pp. L83 ◽  
Author(s):  
G. R. Ricker ◽  
S. G. Ryckman ◽  
J. E. Ballintine ◽  
J. P. Doty ◽  
P. M. Downey ◽  
...  
Keyword(s):  
Crab Nebula ◽  
High Energy ◽  
X Ray ◽  
Lunar Occultation ◽  
The Crab Nebula

scholarly journals Time-Domain Astronomy with Swift, Fermi and Lobster

2011 ◽  
Vol 7 (S285) ◽  
pp. 41-46 ◽  
Author(s):  
Neil Gehrels ◽  
Scott D. Barthelmy ◽  
John K. Cannizzo
Keyword(s):  
Gamma Ray ◽  
Crab Nebula ◽  
High Energy ◽  
Tidal Disruption ◽  
X Ray ◽  
Order Of Magnitude ◽  
New Type ◽  
The Crab Nebula ◽  
High Energy Emission ◽  
Higher Sensitivity

AbstractThe dynamic transient gamma-ray sky is revealing many interesting results, largely due to findings by Fermi and Swift. The list includes new twists on gamma-ray bursts (GRBs), a GeV flare from a symbiotic star, GeV flares from the Crab Nebula, high-energy emission from novae and supernovae, and, within the last year, a new type of object discovered by Swift—a jetted tidal disruption event. In this review we present highlights of these exciting discoveries. A new mission concept called Lobster is also described; it would monitor the X-ray sky at order-of-magnitude higher sensitivity than current missions can.

Lunar occultation of the hard X-ray source in the Crab Nebula

Nature ◽  
1975 ◽  
Vol 255 (5508) ◽  
pp. 465-466 ◽  
Author(s):  
Y. FUKADA ◽  
S. HAYAKAWA ◽  
I. KASAHARA ◽  
F. MAKINO ◽  
Y. TANAKA ◽  
...  
Keyword(s):  
Crab Nebula ◽  
X Ray ◽  
Lunar Occultation ◽  
The Crab Nebula

Sky survey of high-energy cosmic X-rays and spectral information on sources in the Crab nebula, Cygnus, and Scorpius

1968 ◽  
Vol 46 (10) ◽  
pp. S409-S413 ◽  
Author(s):  
Walter H. G. Lewin ◽  
George W. Clark ◽  
William B. Smith
Keyword(s):  
Crab Nebula ◽  
High Energy ◽  
X Rays ◽  
Coma Cluster ◽  
X Ray ◽  
Sky Survey ◽  
Upper Limits ◽  
Intensity Ratios ◽  
The Crab Nebula ◽  
Made In

A complete X-ray survey of the northern sky has been made in the energy range 20–100 keV. Spectra are given for Cyg X-1 and Tau X-1. Intensity ratios (Cyg X-1/Tau X-1) of 0.84 ± 0.10 and 1.30 ± 0.25 were derived in the 20–70 keV range from data obtained on July 19, 1966 and February 13, 1967, respectively. Observations on Sco X-1 and the Coma cluster show upper limits which are quite different from results reported by other groups.

scholarly journals High energy cosmic photons and neutrinos

1965 ◽  
Vol 23 ◽  
pp. 195-225
Author(s):  
R. J. Gould ◽  
G. R. Burbidge
Keyword(s):  
Supernova Remnants ◽  
Crab Nebula ◽  
Meson Production ◽  
Cosmic Ray ◽  
High Energy ◽  
Relativistic Electrons ◽  
X Ray ◽  
Hard Radiation ◽  
The Galaxy ◽  
The Crab Nebula

This review concentrates primarily on the problem of interpreting the recent X-ray and γ-ray observations of celestial sources. The expected fluxes of hard radiation from various processes are estimated (when possible) and are compared with the observations. We compute the synchrotron, bremsstrahlung, and (inverse) Compton spectra originating from relativistic electrons produced (via meson production) in the galaxy and intergalactic medium by cosmic ray nuclear collisions; the spectra from π°-decay are also computed. Neutron stars, stellar coronae, and supernova remnants are reviewed as possible X-ray sources. Special consideration is given to the processes in the Crab Nebula. Extragalactic objects as discrete sources of energetic photons are considered on the basis of energy requirements; special emphasis is given to the strong radio sources and the possibility of the emission of hard radiation during their formation. The problem of the detection of cosmic neutrinos is reviewed.As yet, no definite process can be identified with any of the observed fluxes of hard radiation, although a number of relevant conclusions can be drawn on the basis of the available preliminary observational results. In particular, some cosmogonical theories can be tested.

scholarly journals The electromagnetic spectrum of the Crab Nebula

1970 ◽  
Vol 37 ◽  
pp. 247-249
Author(s):  
Krishna M. V. Apparao
Keyword(s):  
Compton Scattering ◽  
Power Law ◽  
Crab Nebula ◽  
High Energy ◽  
Electromagnetic Spectrum ◽  
Microwave Region ◽  
X Ray ◽  
High Energy Electrons ◽  
Γ Ray ◽  
The Crab Nebula

The electromagnetic spectrum of the Crab Nebula has been determined experimentally in the radio, optical, and X-ray regions [1], in which it follows a power law of the type S(v) = Av−α, where S(v) is the power (in watts/m2 sec Hz), A and α are constants, and v is the frequency in Hz. Recent measurements [2–5], however, show a deviation from a power law in the microwave region (see Figure 1). In this paper, we investigate the origin of this deviation and calculate the γ-Ray spectrum due to this increase in the microwave photons via the Compton scattering from high-energy electrons.

Hard X-ray observations of the Crab Nebula and A0535+26 with a high energy resolution spectrometer

1983 ◽  
Vol 270 ◽  
pp. 144 ◽  
Author(s):  
J. M. Hameury ◽  
D. Boclet ◽  
Ph. Durouchoux ◽  
T. L. Cline ◽  
B. J. Teegarden ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Crab Nebula ◽  
High Energy ◽  
High Energy Resolution ◽  
X Ray ◽  
The Crab Nebula ◽  
Resolution Spectrometer

scholarly journals The high-energy X-ray spectrum of the Crab Nebula observed from OSO-8

1977 ◽  
Vol 217 ◽  
pp. 809 ◽  
Author(s):  
J. F. Dolan ◽  
C. J. Crannell ◽  
B. R. Dennis ◽  
K. J. Frost ◽  
L. E. Orwig ◽  
...  
Keyword(s):  
Crab Nebula ◽  
High Energy ◽  
X Ray ◽  
The Crab Nebula

Lunar Occultation of X-ray Emission from the Crab Nebula

Science ◽  
1964 ◽  
Vol 146 (3646) ◽  
pp. 912-917 ◽  
Author(s):  
S. Bowyer ◽  
E. T. Byram ◽  
T. A. Chubb ◽  
H. Friedman
Keyword(s):  
Crab Nebula ◽  
X Ray ◽  
Lunar Occultation ◽  
The Crab Nebula

A scanning modulation collimator observation of the high-energy X-ray source in the Crab Nebula

1987 ◽  
Vol 319 ◽  
pp. 416 ◽  
Author(s):  
R. M. Pelling ◽  
W. S. Paciesas ◽  
L. E. Peterson ◽  
K. Makishima ◽  
M. Oda ◽  
...  
Keyword(s):  
Crab Nebula ◽  
High Energy ◽  
X Ray ◽  
Modulation Collimator ◽  
The Crab Nebula
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