The team also concluded that the likely population of black holes in the galaxy is 200 million-about what most theorists predicted. The analysis includes four other microlensing events that the team concluded were not caused by a black hole, though two were likely caused by a white dwarf or a neutron star. The analysis by Lam, Lu and their international team has been accepted for publication in The Astrophysical Journal Letters. I think we have opened a new window onto these dark objects, which can't be seen any other way.'ĭetermining how many of these compact objects populate the Milky Way galaxy will help astronomers understand the evolution of stars-in particular, how they die-and of our galaxy, and perhaps reveal whether any of the unseen black holes are primordial black holes, which some cosmologists think were produced in large quantities during the Big Bang. 'With microlensing, we're able to probe these lonely, compact objects and weigh them. 'This is the first free-floating black hole or neutron star discovered with gravitational microlensing,' Lu said. Whether a black hole or a neutron star, the object is the first dark stellar remnant-a stellar 'ghost'-discovered wandering through the galaxy unpaired with another star.

Neutron stars are also dense, highly compact objects, but their gravity is balanced by internal neutron pressure, which prevents further collapse to a black hole. Because astronomers think that the leftover remnant of a dead star must be heavier than 2.2 solar masses in order to collapse to a black hole, the UC Berkeley researchers caution that the object could be a neutron star instead of a black hole. The team, led by graduate student Casey Lam and Jessica Lu, a UC Berkeley associate professor of astronomy, estimates that the mass of the invisible compact object is between 1.6 and 4.4 times that of the sun. Now, a team led by University of California, Berkeley, astronomers has for the first time discovered what may be a free-floating black hole by observing the brightening of a more distant star as its light was distorted by the object's strong gravitational field-so-called gravitational microlensing.

Stsci astrometry