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ASCA Observations of the Crab-Like Pulsar PSR B0540 – 69

Published online by Cambridge University Press:  12 April 2016

F. Nagase ,
T. Endo ,
M. Hirayama ,
N. Kawai  and
M. Itoh
F. Nagase
Affiliation:
The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
T. Endo
Affiliation:
The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
M. Hirayama
Affiliation:
Santa CruzInstitute for Particle Physics, University of California, Santa Cruz, CA 95064, U.S.A.
N. Kawai
Affiliation:
The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
M. Itoh
Affiliation:
Faculty of Human Development, Kobe University, Tsurukabuto, Nada, Kobe 657-8501, Japan

Abstract

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We report on the spectral and temporal properties of the 50 ms pulsar PSR B0540–69 using ASCA archival data obtained during 1993 to 1995. From the spectral analysis it was found that the spectra of the whole (nebular and pulsed) emission and pulsed emission in the range 1-10 keV can be represented by a single power law of photon index, Γ = 2.00 ± 0.02 and Γpulsed = 1.7 ± 0.3 respectively. The parameters for pulse frequency change during 1993-1995 were obtained using the 9 pulse frequency measurements with ASCA. The parameters derived from the ASCA observations are consistent with the previous measurements, suggesting high stability of this pulsar, ΔΩ/Ω ≲ 0.5 × 10−7 over the past 10 years. These results confirm similarity of this pulsar with the Crab pulsar.

Type
Part 5. High-Energy Observations
Information
International Astronomical Union Colloquium , Volume 177: Pulsar Astronomy - 2000 and Beyond , 2000 , pp. 343 - 346
Copyright
Copyright © Astronomical Society of the Pacific 2000

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