Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8529865m&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
Neutron Stars, Neutrons, X Ray Astronomy, Cosmology, Luminosity, Mass, Superfluidity, Temperature, X Rays
Scientific paper
Axions thermally emitted by a neutron star would be converted into X-rays in the strong magnetic field surrounding the star. An improvement in the observational upper limit of pulsed X-rays from the Vela pulsar (PSR 0833-45) by a factor 12 would constrain the axion mass M/sub a/ 2 x 10 to the -3 eV if the core is non-superfluid and at temperature T/sub c/ greater than or equal to 2 x 10 to the 8 K. If the core is superfluid throughout, an improvement factor of 240 would be needed to provide the same constraint on the axion mass, while in the absence of superfluidity, an improvement factor of 200 could constrain M/sub a/ 6 x 10 to the -4 eV. A search for modulated hard X-rays from PSR 1509-58 or other young pulsars at presently attainable sensitivities may enable the setting of an upper limit for the axion mass. Observation of hard X-rays from a very young hot pulsar with T/sub c/greater than or equal to 7 x 10 to the 8 K could set a firm bound on the axion mass, since neutron superfluidity is not expected above this temperature. The remaining axion mass range 6 x 10 to the -4 eV MA 10 to the -5 eV (the cosmological lower bound) can be covered by an improved Sikivie type laboratory cavity detector for relic axions constituting the galactic halo.
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