Implications of Hyperon Pairing for Cooling of Neutron Stars

The implications of hyperon pairing for the thermal evolution of neutronstars containing hyperons are investigated. The outcome of cooling simulationsare compared for neutron star models composed only of nucleons and leptons,models including hyperons, and models including pairing of hyperons. We showthat lambda and neutron pairing suppresses all possible fast neutrino emissionprocesses in not too massive neutron stars. The inclusion of lambda pairingyields better agreement with X-ray observations of pulsars. Particularly, thesurface temperatures deduced from X-ray observations within the hydrogenatmosphere model are more consistent with the thermal history of neutron starscontaining hyperons, if the critical temperature for the onset of lambda andnucleon pairing is not too small.