Radio-quiet neutron star
Overview
 
A radio-quiet neutron star is a neutron star
Neutron star
A neutron star is a type of stellar remnant that can result from the gravitational collapse of a massive star during a Type II, Type Ib or Type Ic supernova event. Such stars are composed almost entirely of neutrons, which are subatomic particles without electrical charge and with a slightly larger...

 that does not seem to emit radio emissions like most other neutron star
Neutron star
A neutron star is a type of stellar remnant that can result from the gravitational collapse of a massive star during a Type II, Type Ib or Type Ic supernova event. Such stars are composed almost entirely of neutrons, which are subatomic particles without electrical charge and with a slightly larger...

s.

Most neutron stars are pulsars, and emit radio radiation.

Quark stars, theoretical neutron star-like objects composed of quark matter, may be radio quiet, according to some theories.

More plausibly however, radio-quiet neutron stars may simply be pulsars which do not pulse in our direction.
 
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