scholarly journals Interstellar Absorption of the Low Energy X-rays from the Crab Nebula

1973 ◽  
Vol 165 (4) ◽  
pp. 355-361 ◽  
Author(s):  
P. A. Charles ◽  
J. L. Culhane ◽  
I. R. Tuohy
Keyword(s):  
Crab Nebula ◽  
Low Energy ◽  
X Rays ◽  
Interstellar Absorption ◽  
The Crab Nebula

Low-energy cosmic X-ray measurements

1969 ◽  
Vol 47 (23) ◽  
pp. 2651-2666 ◽  
Author(s):  
A. J. Baxter ◽  
B. G. Wilson ◽  
D. W. Green
Keyword(s):  
Spectral Analysis ◽  
Energy Range ◽  
Crab Nebula ◽  
Spectral Characteristics ◽  
Low Energy ◽  
Data Recovery ◽  
X Rays ◽  
X Ray ◽  
Recovery System ◽  
The Crab Nebula

An experiment is described to investigate cosmic X rays in the energy range 0.25–12 keV. The data-recovery system and methods of spectral analysis are considered. Results are presented for the energy spectrum of the diffuse X-ray component and its distribution over the northern sky down to 1.6 keV with a limited extension at 0.27 keV.In the energy range 1.6 to 12 keV, the spectrum is represented by:[Formula: see text]although separate analyses indicate a flattening below 4.5 keV to give:[Formula: see text]and[Formula: see text]At the lowest energies, the flux appears to increase more rapidly and exhibits some anisotropy in arrival directions related to the gross galactic structure. Spectral characteristics of the Crab Nebula and Cygnus X-2 have also been determined.

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

VIBRATING NEUTRON STARS

1967 ◽  
Vol 45 (9) ◽  
pp. 2823-2831 ◽  
Author(s):  
Carl J. Hansen ◽  
Sachiko Tsuruta
Keyword(s):  
Neutron Stars ◽  
Storage Capacity ◽  
Vibrational Energy ◽  
Crab Nebula ◽  
X Rays ◽  
Vibrational Heating ◽  
Large Spread ◽  
Vibrational Energies ◽  
The Crab Nebula ◽  
Urca Process

The time variation of some interesting properties of vibrating neutron stars is considered. The models used are based on two nuclear potentials that cover a large spread of possibilities. The modified URCA neutrino process has been assumed to be the major damping mechanism. The calculations are performed both for the case when the vibration energy is partially converted into heat through the URCA process and for the case when this conversion does not take place. It is found that the vibrational energy-storage capacity is extremely model-dependent. The vibrational energies at 1 000 years range from about 1047 to 1050 ergs, which are sufficiently large as a possible energy source for the X rays from the Crab Nebula, ft is shown also that the cooling times of neutron stars will not be significantly increased by the inclusion of the vibrational heating.

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 X rays from the Crab Nebula

1966 ◽  
Vol 71 (13) ◽  
pp. 3261-3264 ◽  
Author(s):  
R. C. Haymes ◽  
W. L. Craddock
Keyword(s):  
Crab Nebula ◽  
High Energy ◽  
X Rays ◽  
The Crab Nebula

Sky Survey of High-Energy Cosmic X-Rays and Spectra of the Sources in the Crab Nebula and Cygnus

1968 ◽  
Vol 151 ◽  
pp. 21 ◽  
Author(s):  
G. W. Clark ◽  
W. H. G. Lewin ◽  
W. B. Smith
Keyword(s):  
Crab Nebula ◽  
High Energy ◽  
X Rays ◽  
Sky Survey ◽  
The Crab Nebula

2-20keV Spectrum of X-Rays from the Crab Nebula and the Diffuse Background Near Galactic Anticenter

1969 ◽  
Vol 156 ◽  
pp. 427 ◽  
Author(s):  
Elihu A. Boldt ◽  
Upendra D. Desai ◽  
Stephen S. Holt
Keyword(s):  
Crab Nebula ◽  
X Rays ◽  
Diffuse Background ◽  
The Crab Nebula

A low-energy gamma-ray observation of the Crab Nebula

1977 ◽  
Vol 212 ◽  
pp. 704 ◽  
Author(s):  
P. Mandrou ◽  
M. Niel ◽  
G. Vedrenne ◽  
A. Dupont
Keyword(s):  
Gamma Ray ◽  
Crab Nebula ◽  
Low Energy ◽  
Energy Gamma ◽  
The Crab Nebula

scholarly journals A search for pulsed hard radiation from the Crab Nebula

1970 ◽  
Vol 37 ◽  
pp. 185-189
Author(s):  
G. J. Fishman ◽  
F. R. Harnden ◽  
R. C. Haymes
Keyword(s):  
Gamma Rays ◽  
Crab Nebula ◽  
Optical Data ◽  
X Rays ◽  
Repetition Period ◽  
Hard Radiation ◽  
The Crab Nebula

This paper reports the detection of repetitive pulses of hard X-rays and gamma rays in data obtained in mid-1967 from the Crab Nebula. The pulses are believed to originate from NP0532 since the observed repetition period is what would be expected on the basis of an extrapolation of recent optical data obtained for NP0532 back to the time of the observation.

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