When searching for black holes,what associated phenomena do astronomers search for?
A)single stars that emit large quantities of X-rays
B)X-ray binaries where the compact companion has a mass in excess of 3 solar masses
C)large spherical regions from which no light is detected
D)pulsars with periods of less than one millisecond

Question

Quizplus · Accepted Answer

Astronomers search for X-ray binaries where the compact companion has a mass in excess of 3 solar masses as this often indicates the presence of a black hole. This is because the strong gravitational pull of a black hole can cause its companion star to transfer gas to it, which emits X-rays as it falls towards the black hole. Single stars emitting X-rays, large spherical regions from which no light is detected, and pulsars with periods of less than one millisecond are not necessarily indicative of black holes.

When Searching for Black Holes,what Associated Phenomena Do Astronomers Search