Comment Re:This is theoretical simulation, not observation (Score 1) 44
The effects on the solar system of having a few solar mass black hole cruise by within 65ly (or less than that for a neutron star) are exactly the same as having a normal star of the same mass do so. And there are plenty of them already within 65ly.
The one way a compact object differs is that if there's a companion star dumping gas into it, you get X-rays. But these are a) much more rare; b) not in the "invisible" population being discussed in this paper, and c) I suspect you'd still have to be either pretty close to one (and/or lined up exactly wrong in a jet) to care.
Any shaped star getting way closer than any current star might perturb the Oort cloud and shovel more comets into the inner solar system: this has been proposed for some of the mass extinction events. Don't need a compact object for that, though.