An absorption feature in the spectrum of the pulsed hard X-ray flux from 4U0115 + 63
Abstract
A spectral feature, apparently an absorption line, has been observed at an energy of 20.1 +/- 0.5 ke V in the pulsed flux of 3.61 s X-ray pulsar 4U0115 + 63 using the UCSD/MIT instrument on HEAO 1. The line strength, expressed as equivalent width, is 3.1 +/- 0.5 ke V. Although essentially unresolved, the feature has a depth more than 60% of the continuum flux. If the feature arises by cyclotron resonance absorption near the magnetic poles of the neutron star, it implies a magnetic field of between ~1.8 and ~2.5 × 1012 G depending on the gravitational redshift (<~5-40%).
- Publication:
-
Nature
- Pub Date:
- November 1979
- DOI:
- 10.1038/282240a0
- Bibcode:
- 1979Natur.282..240W
- Keywords:
-
- Absorption Spectra;
- Pulsars;
- Stellar Radiation;
- Stellar Spectra;
- X Ray Sources;
- Cyclotron Resonance;
- Energy Spectra;
- Heao 1;
- Neutron Stars;
- Radiant Flux Density;
- Spectral Line Width;
- Astrophysics