ESA has posted a neutron star they estimate 5 mile diameter accidentally being photoed in orbit of blue giant 1,000 ly away from Earth, and is NOT drawing from primary, possibly not magnetically active at this time?
Please stop with the gravity waves, as are not. Magnetic field around neutron bit has wash over effects like sea tides. Front effects compress, back side effects expand. Brown dwarfs do not roam our galaxy or any other. Neuton bits do and may be the unseen but felt mass and energy. Yes, neutron stars have both magnetic and gravitational fields.
http://bowshooter.blogspot.com/2011/06/esa-xmm-newton-neutron-star-bites-off.html
Hopefully the Electrical Universe is pursuing a theory that allows neutron star creation other than the nefarious Zpinch which in actual practice has proved to be too unstable to be of practical use. No there are no black holes.
Since our basis of quantum physics stops at compressing hydrogen, everything else like black holes is theory.