Neutron star mimics black hole

Besides 600 X-ray pulses every second, the accreting millisecond pulsar IGR J00291+5934 showed extremely strong variability on a wide range of timescales. By studying its aperiodic variability we found the strongest broad band noise with the lowest characteristic frequencies ever observed in an accreting neutron star. The similarities with previously known accreting black holes are striking.

See all details in Linares et al. 2007