Understanding the X-ray spectrum of anomalous X-ray pulsars and soft gamma-ray repeaters
نویسندگان
چکیده
منابع مشابه
Soft Gamma Repeaters and Anomalous X-ray Pulsars: Together Forever
I review of the observational properties of Soft Gamma Repeaters (SGRs) and Anomalous X-ray Pulsars (AXPs), two unusual manifestations of neutron stars. I summarize the reasoning for SGRs being “magnetars,” neutron stars powered by the decay of a very large magnetic field, and the now compelling evidence that SGRs and AXPs are in fact members of the same source class, as predicted uniquely by t...
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Baade & Zwicky (1934) were the first to envision the formation of neutron stars as the end product of a supernova explosion. Their forward thinking was not vindicated for another three decades, with the discovery of the first radio pulsars by Bell and Hewish (Hewish et al. 1968). What Baade and Zwicky could not have anticipated, however, was the menagerie of astrophysical objects that are now a...
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We show that the irradiated accretion disk model can account for all the optical and infrared observations of the anomalous X-ray pulsars in the persistent state. While placing an upper limit on the inner disk radii, and thus on the strength of the dipole component of the stellar magnetic field, the model fits do not constrain the outer disk radii. And while magnetar fields ( G) in higher multi...
متن کاملNature vs. Nurture: The Origin of Soft Gamma–ray Repeaters and Anomalous X–ray Pulsars
Soft gamma–ray repeaters (SGRs) and anomalous x–ray pulsars (AXPs) are young and radio-quiet x-ray pulsars which have been rapidly spun-down to slow spin periods clustered in the range 5− 12 s. Most of these unusual pulsars also appear to be associated with supernova shell remnants (SNRs) with typical ages < 30 kyr. By examining the sizes of these remnants versus their ages, we demonstrate that...
متن کاملThe strongest cosmic magnets: Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars
Two classes of X-ray pulsars, the Anomalous X–ray Pulsars and the Soft Gamma–ray Repeaters, have been recognized in the last decade as the most promising candidates for being magnetars: isolated neutron stars powered by magnetic energy. I review the observational properties of these objects, focussing on the most recent results, and their interpretation in the magnetar model. Alternative explan...
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ژورنال
عنوان ژورنال: Research in Astronomy and Astrophysics
سال: 2015
ISSN: 1674-4527
DOI: 10.1088/1674-4527/15/4/006