Observational Implications of a Fall-back Crust around a Quark-nova Compact Remnant: Application to AXPs and SGRs

Details Observational Implications of a Fall-back Crust around a Quark-nova Compact Remnant: Application to AXPs and SGRs Observational Implications of a Fall-back Crust around a Quark-nova Compact Remnant: Application to AXPs and SGRs

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20913103l&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #131.03; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Mass is ejected from a quark stars formed by the Quark-Nova process (Ouyed, Dey and Dey, 2002 A&A, 390, L39; Keranen, Ouyed and Jaikumar 2005 ApJ, 681, 485). Some fraction of this ejecta is below escape velocity and falls back toward the compact object. If the magnetic field of the compact object is high enough, the fall-back material forms a shell of iron-rich material which then evolves quasi-statically. We explore the formation and evolution of such a fall-back crust (so-called because the material originates in the crust of the neutron star progenitor to the quark-nova). We find the resulting properites have application to the observed properties of Soft Gamma-ray Repeaters (SGRs) and Anomolous X-ray Pulsars (AXPs). These observed features of SGRs and AXPs are: (i) the two types of bursts (giant and regular); (ii) the spin-up and spin-down episodes during and following the bursts with associated persistant increases in period derivative ; (iii) the energetics of the boxing day burst, SGR1806+20; (iv) the presence of an Iron line as observed in SGR1900+14; (v) the correlation between the far-Infrared and the X-ray fluxes during the bursting episode and the quiescent phase; (vi) the hard X-ray component observed in SGRs during the giant bursts, and (vii) the discrepancy between the ages of SGRs/AXPs and their supernova remnants. We also find a natural evolutionary relationship between SGRs and AXPs in our model which predicts that only the youngest SGRs/AXPs are most likely to exhibit strong bursting.
We acknowledge funding for this research from the Natural Science and Engineering Research Council of Canada.

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