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2000ApJ...543..373D - Astrophys. J., 543, 373-385 (2000/November-1)
AU-scale synchrotron jets and superluminal ejecta in GRS 1915+105.
DHAWAN V., MIRABEL I.F. and RODRIGUEZ L.F.
Abstract (from CDS):
At lower resolution (80-240 AU), more extended ejecta are imaged at ∼500 AU separation from the stationary core. Time-lapse images clearly detect the superluminal motion of the ejecta in a few hours. The measured velocity is 1.5c±0.1c (D/12 kpc) for the approaching component and is consistent with ballistic motion of the ejecta from 500 AU outward, perhaps even since birth. The axis of the ejecta differs by ≤12° clockwise from the axis of the AU-scale jet, measured in the same observation. Both axes are stable in time (±5°), the AU scale for 2 yr and the large scale for over 4 yr. Astrometry over 2 yr relative to an extragalactic reference locates the black hole to ±1.5 mas, and its secular parallax due to Galactic rotation is 5.8±1.5 mas.yr–1, consistent with a distance of 12 kpc. Finally, a limit of ≤100 km.s–1 is placed on its proper motion with respect to its neighborhood.
Some accreting black holes of stellar mass (e.g., Cyg X-1, 1E 1740-2942, GRS 1758-258, GX 339-4) and supermassive black holes at the center of galaxies (e.g., Sgr A*) lack evidence of large flares and discrete transient ejecta but have compact radio cores with steady, flat-spectrum ``plateau'' states, like GRS 1915+105. To the present day GRS 1915+105 is the only system where both AU-scale steady jets and large-scale superluminal ejections have been unambiguously observed. Our observations suggest that the unresolved flat-spectrum radio cores of accreting black holes are compact quasi-continuous synchrotron jets.
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Journal keyword(s): Radio Continuum: Stars - Stars: Individual: Alphanumeric: GRS 1915+105 - X-Rays: Stars
Simbad objects: 9
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