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Characteristics of the persistent emission of SGR 1806-20Earlier, using the X-ray satellite ASCA, we had identified the soft gamma-ray burst repeater (SGR) 1806-20 with a persistent X-ray source, AX 1805.7-2025 which is located close to the center of the radio supernova remnant G10.0-0.3. A burst seen by Burst and Transient Source Experiment (BATSE) was shown to be centered on G10.0-0.3. Here we report detailed temporal and spectral analysis of the persistent source. We find that AX 1805.7-2025 is a very compact source, size less than 30 sec in diameter, with a power-law spectrum. The count rate from AX 1805.7-2025 is steady on timescales of minutes, days, and 1 week. Most supernova remnants have extended X-ray emission ascribed to shocked gas. We set an upper limit to an extended X-ray emission both in continuum and line emission. We conclude that an isolated neutron star, most likely a pulsar, powers the radio remnant G10.0-0.3. Finally, we note that the persistent spectrum appears to be less absorbed than the burst spectrum.
Document ID
19950036854
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sonobe, T.
(Institute of Space and Astronautical Science Kanagawa, Japan)
Murakami, T.
(Institute of Space and Astronautical Science Kanagawa, Japan)
Kulkarni, S. R.
(California Institute of Technology, Pasadena, CA United States)
Aoki, T.
(Institute of Space and Astronautical Science Kanagawa, Japan)
Yoshida, A.
(Institute of Physical and Chemical Research Saitama, Japan)
Date Acquired
August 16, 2013
Publication Date
November 20, 1994
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 436
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A68453
Distribution Limits
Public
Copyright
Other

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