Letter to the Editor
SGRs and AXPs proposed as ancestors of the Magnificent Seven
Department of Physics and Astronomy, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4 Canada e-mail: email@example.com
Accepted: 18 October 2007
The recently suggested correlation between the surface temperature and the magnetic field in isolated neutron stars does not seem to work well for SGRs, AXPs and X-ray dim isolated neutron stars (XDINs; specifically the Magnificent Seven or M 7). Instead, by appealing to a color-flavor locked quark star (CFLQS) we find a more natural explanation. In this picture, the heating is provided by magnetic flux expulsion from a crust-less superconducting quark star. Combined with our previous studies concerning the possibility of SGRs, AXPs, and XDINs as CFLQSs, this provides another piece of evidence that these objects are all related. Specifically, we propose that XDINs are the descendants of SGRs and AXPs.
Key words: dense matter / stars: magnetic fields / stars: neutron / X-rays: stars / X-rays: bursts / radiation mechanisms: non-thermal
© ESO, 2007