Self-shielding of Soft X-rays in SN Ia Progenitors. (arXiv:1208.0858v1 [astro-ph.HE])

Self-shielding of Soft X-rays in SN Ia Progenitors. (arXiv:1208.0858v1 [astro-ph.HE]):
There are insufficient super soft (~ 0.1 keV) X-ray sources in either spiral
or elliptical galaxies to account for the rate of explosion of Type Ia
supernovae in either the single degenerate or the double degenerate scenarios.
We quantify the amount of circumstellar matter that would be required to
suppress the soft X-ray flux by yielding a column density in excess of 10^{23}
cm^{-2}. We summarize evidence that appropriate quantities of matter are extant
in SN Ia and in recurrent novae that may be supernova precursors. The obscuring
matter is likely to have a large, but not complete, covering factor and to be
substantially non-spherically symmetric. Assuming that much of the absorbed
X-ray flux is re-radiated as black-body radiation in the UV, we estimate that
fewer than 100 sources might be detectable in the GALEX all sky survey.