Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20911504h&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #115.04; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We have performed a second observation of SAX J1808.4-3658 in quiescence (after the first in 2001, Campana et al. 2002). Reanalyzing both observations, our observation finds SAX J1808.4-3658 at a 30% lower (2 sigma) observed flux level, Fx(0.5-10 keV)=3.1*10-14 ergs/cm2/s. The spectrum is similar to the previous quiescent observation, consistent with a power-law of photon index 1.8 without strong evidence for a neutron star atmosphere component. Considering the new distance (3.5 kpc) recently calculated by Galloway and Cumming, we constrain the bolometric luminosity from the neutron star to LNS,bol<10^31 ergs/s, the lowest yet measured. This low quiescent luminosity requires enhanced neutrino cooling from the neutron star core, more than can be provided by either kaon or pion condensates in the core.
Heinke Craig O.
Jonker Peter G.
Taam Ronald E.
Wijnands Rudy
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