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

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.

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

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 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

scholarly journals Pulsar (and X-Star) Emission from the Magnetosphere of a Collapsed Star

1971 ◽  
Vol 46 ◽  
pp. 460-470
Author(s):  
Bruno Coppi ◽  
Attilio Ferrari
Keyword(s):  
Special Reference ◽  
Crab Nebula ◽  
Nonthermal Plasma ◽  
High Energy ◽  
Physical Characteristics ◽  
Pulsar Emission ◽  
X Ray ◽  
Γ Rays ◽  
The Crab Nebula ◽  
High Energy Particles

We propose nonthermal plasma mechanisms to account for the most evident physical characteristics of pulsar emission, including the production of X- and γ-rays and the acceleration of high-energy particles. Special reference to the Crab Nebula pulsar (NP 0532) is made and an application of the same model to other non-thermal X-ray sources is suggested.

Calibration of the High Energy Replicated Optics to Explore the Sun (HEROES) Hard X-ray Telescope

2014 ◽  
Vol 03 (02) ◽  
pp. 1440007 ◽  
Author(s):  
Colleen A. Wilson-Hodge ◽  
Jessica Gaskin ◽  
Steven Christe ◽  
Albert Shih ◽  
Allyn Tennant ◽  
...  
Keyword(s):  
Crab Nebula ◽  
Grazing Incidence ◽  
High Energy ◽  
Stray Light ◽  
Detector Response ◽  
The Sun ◽  
X Ray ◽  
Laboratory Calibration ◽  
Grazing Incidence Optics ◽  
The Crab Nebula

On 2013 September 21–22, the High Energy Replicated Optics to Explore the Sun (HEROES) hard X-ray telescope flew as a balloon payload from Ft. Sumner, NM. HEROES observed the Sun, the black hole binary GRS 1915+105, and the Crab Nebula during its 27 h flight. In this paper, we describe laboratory calibration measurements of the HEROES detectors using line and continuum sources and applications of these measurements to define channel to energy (gain) corrections for observed events and to define detector response matrices. We characterize the HEROES X-ray grazing incidence optics using measurements taken in the Stray Light Facility (SLF) in Huntsville, AL, and using ray traces. We describe the application of our calibration measurements to in-flight observations of the Crab Nebula.

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