Limits from the soft X-ray background on the temperature of old neutron stars and on the flux of superheavy magnetic monopoles

Details Limits from the soft X-ray background on the temperature of old neutron stars and on the flux of superheavy magnetic monopoles Limits from the soft X-ray background on the temperature of old neutron stars and on the flux of superheavy magnetic monopoles

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...286..702k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 286, Nov. 15, 1984, p. 702-710. Research supported by the Los Alamos Nation

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17

Background Radiation, Magnetic Monopoles, Neutron Stars, Stellar Luminosity, Stellar Temperature, X Ray Sources, Diffuse Radiation, Milky Way Galaxy, Radioactive Decay, Stellar Evolution

Scientific paper

Using recent observations of the diffuse, soft X-ray background, we obtain upper limits of 49 eV to the average surface temperature and 1032 ergs s-1 to the total photon luminosity of old (˜ 1010 yr) neutron stars in the Galaxy. If neutron stars are kept hot through monopole-induced nucleon decay, this limit corresponds to a monopole flux limit of FM(σ0 β) < 3r x 10-23 cm-2 sr-1 s-1, where the cross section for catalyzed nucleon decay times the monopole-nucleon relative velocity is σ v = 10-28(σ0 βc) cm2 (β = v/c), and r=LTOT/Lγ is the ratio of the total luminosity to the photon luminosity of a neutron star whose surface temperature T ≍ 50 eV. For conventional neutron star equations of state r ≍ 1, while for the more exotic ones r can be O(103-104). Although our temperature limit places a very stringent limit on the monopole flux, it does not significantly constrain other mechanisms for heating old neutron stars.

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