Lunar occultation of the hard X-ray source in the Crab Nebula
Abstract
Results obtained by balloon scintillation counter observations of hard X-rays from the Crab Nebula at a lunar occultation on January 24, 1975 are reported. Counting rate data are presented, and a transition in counting rate is evident at 16 h 41 min UT. Referring to the standard 10 kHz time signal, the present workers found the apparent period of the Crab pulsar to the 33.17582 ms, which is consistent with the barycentric period of 33.1736 ms obtained from radio observation at Arecibo. A Gaussian model of the diffuse source was fitted to the observed counting rates; the observed data were also fitted to an alternative model that assumes two essentially line sources and the pulsar in between.
- Publication:
-
Nature
- Pub Date:
- June 1975
- DOI:
- 10.1038/255465a0
- Bibcode:
- 1975Natur.255..465F
- Keywords:
-
- Balloon-Borne Instruments;
- Crab Nebula;
- Lunar Occultation;
- Radiant Flux Density;
- Radio Sources (Astronomy);
- X Ray Sources;
- Balloon Sounding;
- Optical Properties;
- Pulsars;
- Radio Observation;
- Scintillation Counters;
- Astronomy;
- BALLOON-BORNE INSTRUMENTS;
- CRAB NEBULA;
- LUNAR OCCULTATION;
- RADIANT FLUX DENSITY;
- RADIO SOURCES (ASTRONOMY);
- X RAY SOURCES;
- BALLOON SOUNDING;
- OPTICAL PROPERTIES;
- PULSARS;
- RADIO OBSERVATION;
- SCINTILLATION COUNTERS