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Title
Japanese: 
English:GINGA observation of the X-ray pulsar 1E 2259+586 in the supernova remnant G109.1-1.0 
Author
Japanese: Koyama, K., Nagase, F., Ogawara, Y., Shinoda, K., 河合 誠之, Jones, M. H., Williams, O. R., Watson, M. G., Makishima, K., Ohashi, T..  
English: Koyama, K., Nagase, F., Ogawara, Y., Shinoda, K., Kawai, N., Jones, M. H., Williams, O. R., Watson, M. G., Makishima, K., Ohashi, T..  
Language English 
Journal/Book name
Japanese: 
English:Publications of the Astronomical Society of Japan 
Volume, Number, Page Vol. 41        pp. 461-471
Published date 1989 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Abstract The X-ray pulsar 1E 2259+586 in the supernova remnant G109.1-1.0 was observed with the Ginga satellite from June 21 to 23, 1987. The heliocentric pulse period is found to be 6.978759 + or - 0.000002 s, confirming a secular spin down rate of 6.2 x 10 to the -13th s/s. The pulsation was observed to have asymmetric double peaks in the energy range from 1 keV to 10 keV. The upper limit on the projected semimajor axis is 0.08 1t-s (3sigma) throughout the period range searched. The constraint on the binary system is discussed in the light of this new upper limit. The energy spectrum of 1E 2259+586 does not show a single power law spectrum but exhibits a complex structure which mimics an emission line at 7.2 keV. An attempt to ascribe the structure to a cyclotron line feature is presented. This interpretation implies a weak magnetic field of 5 x 10 to the 11th G at the neutron star surface of 1E 2259+586.

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