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Query : 2000ApJ...543..373D |
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.
Abstract Copyright: ∼
Journal keyword(s): Radio Continuum: Stars - Stars: Individual: Alphanumeric: GRS 1915+105 - X-Rays: Stars
Simbad objects: 9
Number of rows : 9 |
N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 3C 84 | Sy2 | 03 19 48.1599902040 | +41 30 42.108850836 | 13.10 | 12.48 | 11.09 | ~ | 4017 | 3 | ||
2 | V* V821 Ara | HXB | 17 02 49.3876391280 | -48 47 23.087954544 | 16.20 | 16.30 | 15.5 | ~ | 2089 | 0 | ||
3 | NAME Great Annihilator | LXB | 17 43 54.83 | -29 44 42.6 | ~ | 674 | 1 | |||||
4 | NAME Sgr A* | X | 17 45 40.03599 | -29 00 28.1699 | ~ | 4400 | 3 | |||||
5 | 2XMM J180112.4-254436 | LXB | 18 01 12.40 | -25 44 36.1 | ~ | 392 | 1 | |||||
6 | Caswell OH 045.47+00.13 | Mas | 19 14 07.4 | +11 12 20 | ~ | 15 | 0 | |||||
7 | Granat 1915+105 | HXB | 19 15 11.55576 | +10 56 44.9052 | ~ | 2633 | 0 | |||||
8 | HD 226868 | HXB | 19 58 21.6757355952 | +35 12 05.784512688 | 9.38 | 9.72 | 8.91 | 8.42 | O9.7Iabpvar | 4349 | 0 | |
9 | V* V1521 Cyg | HXB | 20 32 25.78 | +40 57 27.9 | WN4/5-6/7 | 1942 | 2 |
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