Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9140m&link_type=abstract
HST Proposal ID #9140
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #9140 Hot Stars
Scientific paper
The formation of black holes is one of the most intriguing problems in astronomy. In the case of stellar-mass black holes, several theories propose that they are born with large space velocities. To test this idea we wish to determine the space velocity of X-ray Nova Scorpii 1994 {GRO J16155-40}, which is one of the best black hole candidates of stellar mass, and a source of jets with apparent superluminal motions. This intriguing object is located eq 2.5^degrees above the galactic plane and the centre of mass of the system is known to be moving with a large anomalous radial velocity { eq -114 km s^-1} with respect to the Local Standard of Rest. Since GRO J16155-40 has already been imaged with the WFPC2 in 1995, one more image with the same instrumental set-up could allow us to measure its expected proper motion with an accuracy of a few percent. The observation proposed here may provide the first unambigous evidence for a black hole formed in the Milky Way that is migrating into intergalactic space.
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