Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7845m&link_type=abstract
HST Proposal ID #7845
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #7845 Hot Stars High-Mass Stars
Scientific paper
We will measure the proper motion of the center of mass of GRS 1915+105 to improve our understanding of the genesis and fate of black holes. GRS 1915+105 is a well-established black hole binary system with superluminal ejections. Our VLA and VLBA observations suggest proper motions of 8 mas/year of the radio core {center of ejections}, which at the distance of GRS 1915+105 corresponds to sim 500 km s-1. However, it has been difficult to estimate possible systematic errors in the absolute astrometry with the radio interferometers. The infrared counterpart in quiescence has Jsim18mag, Hsim16mag, and Ksim14mag {Mirabel et al. 1994}, and we propose to confirm the proper motion of the binary using NICMOS images taken one year apart. If the proper motion of GRS 1915+105 is confirmed beyond doubt, the proposed observations will support the idea that a significant fraction of the collapsed massive stars are runaway black holes, and that natal recoils give rise to an intergalactic black-hole population analogous to the intergalactic population of neutron stars.
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