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Study of the luminosity-dependent cyclotron resonance energies of the binary X-ray pulsar 4U 0115+63 with RXTE |
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| Authors: | M Nakajima T Mihara K Makishima H Niko |
| Institution: | aCollege of Science and Technology, Nihon University, 1-8-14, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan bCosmic Radiation, The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan cDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan |
| Abstract: | We report on the luminosity dependent change of the cyclotron resonance energy obtained from a transient X-ray pulsar, 4U 0115+63. Using RXTE data observed on 1999 March, we found that the fundamental resonance energy stayed constant ( 11 keV) when the source luminosity was above 5 × 1037 erg s−1. As the luminosity decreased below 5 × 1037 erg s−1, the fundamental resonance energy gradually increased up to 16 keV at 0.16 × 1037 erg s−1. The luminosity dependence of the resonance energy can be understood by the change of the accretion column height. |
| Keywords: | X-ray Binary Pulsar Cyclotron |
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