Implications of hyperon pairing for cooling of neutron stars

The implications of hyperon pairing for the thermal evolution of neutron st ars containing hyperons are investigated. The outcomes of cooling simulatio ns are compared for neutron star models composed only of nucleons and lepto ns, models including hyperons, and models including pairing of hyperons. We show that lambda and neutron pairing suppresses all possible fast neutrino emission processes in not too massive neutron stars. The inclusion of lamb da pairing yields better agreement with X-ray observations of pulsars, Part icularly, the surface temperatures deduced from X-ray observations within t he hydrogen atmosphere model are more consistent with the thermal history o f neutron stars containing hyperons, if the critical temperature for the on set of lambda and nucleon pairing is not too small.