Hostname: page-component-cd9895bd7-gxg78 Total loading time: 0 Render date: 2024-12-12T14:45:07.207Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

References

Duncan, R.C., & Thompson, C. 1992, ApJ, 392, L9 CrossRefGoogle Scholar
Ghosh, P., Angelini, L., & White, N.E. 1997, ApJ, 478, 713 CrossRefGoogle Scholar
Heyl, J.S., & Hernquist, L. 1999, MNRAS, 304, L37 CrossRefGoogle Scholar
Melatos, A. 1999, ApJ, 519, L77 CrossRefGoogle Scholar
Mereghetti, S., & Stella, S. 1995, ApJ, 442, L17 CrossRefGoogle Scholar
Israel, G.L., et al., 1999, A&A, 346, 929 Google Scholar
Paul, B., Kawasaki, M., Dotani, T., & Nagase, F. 1999, ApJ(in preparation)Google Scholar
Thompson, C. & Duncan, R.C. 1996, ApJ, 473, 322 CrossRefGoogle Scholar
van Paradijs, J., Taam, R.E., & van den Heuvel, E.P.J. 1995, A&A, 299, L41 Google Scholar