RS Ophiuchi in Quiescence: Why is it X-ray Faint?
Koji Mukai
TL;DR
RS Oph's quiescent X-ray faintness, despite high accretion rates, challenges expectations and suggests mechanisms suppressing its 2-10 keV X-ray emission, unlike similar systems.
Contribution
This paper investigates the unexpectedly faint X-ray emission of RS Oph in quiescence and explores potential mechanisms for suppression.
Findings
RS Oph is a modest soft X-ray source in quiescence.
It differs from T CrB in X-ray emission characteristics.
Possible suppression mechanisms for 2-10 keV X-rays are discussed.
Abstract
The short interval between successive outbursts of RS Oph strongly suggests that it has a high mass white dwarf accreting at a high rate. This, in turn, suggests the possibility of prominent X-ray emission from RS Oph in quiescence. However, archival quiescent X-ray observations of RS Oph show it to be a modest soft X-ray source but not a strong 2-10 keV X-ray source. In this aspect, RS Oph differs markedly from T CrB. We speculate on the possible mechanisms that could significantly suppress the 2-10 keV X-ray emission in RS Oph.
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Taxonomy
TopicsAstrophysical Phenomena and Observations · Gamma-ray bursts and supernovae · Astronomy and Astrophysical Research