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X-Ray Spectra and Pulse Frequency Changes in Sax J2103.5+4545 by A. Baykal, Nasa Technical Reports Server (Ntrs), Et Al - Paperback
58.80 AED

X-Ray Spectra and Pulse Frequency Changes in Sax J2103.5+4545 by A. Baykal, Nasa Technical Reports Server (Ntrs), Et Al - Paperback

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Category Type
Politics
ISBN
9781287293057
Author
A. Baykal, Nasa Technical Reports Server (Ntrs), Et Al
Publisher
Bibliogov
Description:

The November 1999 outburst of the transient pulsar SAX J2103.5+4545 was monitored with the large area detectors of the Rossi X-Ray Timing Explorer until the pulsar faded after a year. The 358 s pulsar was spun up for 150 days, at which point the flux dropped quickly by a factor of approximately 7, the frequency saturated and, as the flux continued to decline, a weak spin-down began. The ...

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    Specifications

    Category Type
    Politics
    ISBN
    9781287293057
    Item EAN
    2724352927478
    People
    Author
    A. Baykal, Nasa Technical Reports Server (Ntrs), Et Al
    People
    Publisher
    Bibliogov
    Category Type
    Politics
    ISBN
    9781287293057
    Item EAN
    2724352927478
    People
    Author
    A. Baykal, Nasa Technical Reports Server (Ntrs), Et Al
    People
    Publisher
    Bibliogov
    Technical Information
    Binding
    Paperback
    Languages and countries
    Book Language
    English
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  •  

    Description:

    The November 1999 outburst of the transient pulsar SAX J2103.5+4545 was monitored with the large area detectors of the Rossi X-Ray Timing Explorer until the pulsar faded after a year. The 358 s pulsar was spun up for 150 days, at which point the flux dropped quickly by a factor of approximately 7,

    The November 1999 outburst of the transient pulsar SAX J2103.5+4545 was monitored with the large area detectors of the Rossi X-Ray Timing Explorer until the pulsar faded after a year. The 358 s pulsar was spun up for 150 days, at which point the flux dropped quickly by a factor of approximately 7, the frequency saturated and, as the flux continued to decline, a weak spin-down began. The pulses remained strong during the decay and the spin-up/flux correlation can be fit to the Ghosh and Lamb derivations for the spin-up caused by accretion from a thin, pressure-dominated disk, for a distance approximately 3.2 kpc and a surface magnetic field approximately 1.2 x 10(exp 13) Gauss. During the bright spin-up part of the outburst, the flux was subject to strong orbital modulation, peaking approximately 3 days after periastron of the eccentric 12.68 day orbit, while during the faint part, there was little orbital modulation. The X-ray spectra were typical of accreting pulsars, describable by a cut-off power-law, with an emission line near the 6.4 keV of Kappa(sub alpha) fluorescence from cool iron. The equivalent width of this emission did not share the orbital modulation, but nearly doubled during the faint phase, despite little change in the column density. The outburst could have been caused by an episode of increased wind from a Be star, such that a small accretion disk is formed during each periastron passage. A change in the wind and disk structure apparently occurred after 5 months such that the accretion rate was no longer modulated or the diffusion time was longer. The distance estimate implies the X-ray luminosity observed was between 1 X 10(exp 36) ergs s(exp -1) and 6 x 10(exp 34) ergs s(exp -1), with a small but definite correlation of the intrinsic power-law spectral index.

    Product Features:
    • Category: Politics
    • Binding: Paperback
    • Language of Text: English
    • Author(s): A. Baykal, Nasa Technical Reports Server (Ntrs), Et Al
    • Publisher: Bibliogov
    • ISBN: 9781287293057
    • Number of Pages: 26
    • Dimensions: 9.69 x 7.44 x 0.05 inches
 

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