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ROSAT observations of pulsed soft X-ray emission from PSR 1055-52Utilizing the position-sensitive proportional counter and the high-resolution imager aboard the orbiting X-ray observatory ROSAT, we have detected pulsations at the radio period from the pulsar PSR 1055-52. The pulse shapes are energy-dependent and show a transition at about 0.5 keV where the phase angle of the pulse peak changes by about -120 deg and the pulsed fraction increases from 11 percent to 63 percent toward larger energies. Simple spectral models are found to be unsatisfactory, while multicomponent models, such as a soft blackbody and hard power-law tail, yield better fits to the pulse-height data. The hard power-law tail is consistent with the extension of the recently reported EGRET results and may indicate a common emission mechanism for the X-ray through GeV gamma-ray regime. The soft blackbody component with T(infinity) = (7.5 +/- 0.6) x 10 exp 5 K, if interpreted as the initial cooling of a neutron star, is consistent with standard cooling models and does not require the presence of exotic components.
Document ID
19930068023
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Oegelman, Hakki
(Wisconsin Univ. Madison; Max-Planck-Inst. fuer Extraterrestrische Physik, Garching, Germany)
Finley, John P.
(Wisconsin Univ. Madison, United States)
Date Acquired
August 16, 2013
Publication Date
August 10, 1993
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 413
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A52020
Funding Number(s)
CONTRACT_GRANT: NAGW-2643
Distribution Limits
Public
Copyright
Other

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