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A 200-Second Quasi-Periodicity After the Tidal Disruption of a Star by a Dormant Black Hole

Miller, J. M.; Reis, R. C.; Maitra, D. +4 more

Supermassive black holes (SMBHs; mass is greater than or approximately 10⁵ times that of the Sun) are known to exist at the center of most galaxies with sufficient stellar mass. In the local universe, it is possible to infer their properties from the surrounding stars or gas. However, at high redshifts we require active, continuous accr…

Absorption Features in the X-ray Spectrum of an Ordinary Radio Pulsar

Pavlov, George G.; Kargaltsev, Oleg; Durant, Martin +1 more

The vast majority of known nonaccreting neutron stars (NSs) are rotation-powered radio and/or γ-ray pulsars. So far, their multiwavelength spectra have all been described satisfactorily by thermal and nonthermal continuum models, with no spectral lines. Spectral features have, however, been found in a handful of exotic NSs and were thought to be a…