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New ASCA Observations of two Anomalous X-ray Pulsars

Published online by Cambridge University Press:  12 April 2016

B. Paul ,
M. Kawasaki ,
T. Dotani  and
F. Nagase
B. Paul
Affiliation:
Institute of Space and Astronautical Science3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
M. Kawasaki
Affiliation:
Institute of Space and Astronautical Science3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
T. Dotani
Affiliation:
Institute of Space and Astronautical Science3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
F. Nagase
Affiliation:
Institute of Space and Astronautical Science3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan

Abstract

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New ASCA observations of two anomalous X-ray pulsars (AXP) 4U 0142+61 and 1E 1048.1-5937, made in 1998, when compared to earlier observations in 1994 show remarkable stability in the intensity, spectral shape and pulse profile. The energy spectra consist of two components, a power-law and a blackbody emission from the neutron star surface. In IE 1048.1-5937, we have identified three epochs with different spin-down rates and discuss its implications for the magnetar hypothesis of the AXPs. We also note that the spin-down rate and its variations in IE 1048.1-5937 are much larger than what normally can be produced by an accretion disc with very low mass accretion rate corresponding to its low X-ray luminosity.

Type
Part 10. Anomalous X-Ray Pulsars and Magnetars
Information
International Astronomical Union Colloquium , Volume 177: Pulsar Astronomy - 2000 and Beyond , 2000 , pp. 695 - 698
Copyright
Copyright © Astronomical Society of the Pacific 2000

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