Repeated relativistic ejections in GRS 1915 + 105

In 1994 February - August we observed with the VLA four ejection events of radio-emitting clouds from the high-energy source GRS 1915 + 105. These events are all consistent with antiparallel ejections of twin pairs of clouds moving away from the compact source at ∼0.92 of the speed of light and angl...

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Autores principales: Rodríguez, L.F., Mirabel, I.F.
Formato: JOUR
Materias:
Radio continuum: Stars
X-rays: Stars
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0004637X_v511_n1PART1_p398_Rodriguez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_0004637X_v511_n1PART1_p398_Rodriguez
record_format dspace
spelling todo:paper_0004637X_v511_n1PART1_p398_Rodriguez2023-10-03T14:01:46Z Repeated relativistic ejections in GRS 1915 + 105 Rodríguez, L.F. Mirabel, I.F. Radio continuum: Stars X-rays: Stars In 1994 February - August we observed with the VLA four ejection events of radio-emitting clouds from the high-energy source GRS 1915 + 105. These events are all consistent with antiparallel ejections of twin pairs of clouds moving away from the compact source at ∼0.92 of the speed of light and angles of ∼70° with respect to the line of sight. The flux ratios and time evolution of the expelled clouds are consistent with actual motions of the radiating matter rather than with the simple propagation of pulses in a medium moving at slower velocities. The large kinetic power of the sudden, short, and rather discontinuous ejections exceeds by more than an order of magnitude the maximum steady photon luminosity of the source, suggesting that in GRS 1915 + 105 a radiation acceleration mechanism of the ejecta is unlikely. As in other galactic and extragalactic radio sources, the decrease in flux density as a function of angular separation from the central source shows a steepening with distance. Additional ejection events have been observed in 1995 and 1997 and we compare them with the 1994 events. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v511_n1PART1_p398_Rodriguez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Radio continuum: Stars
X-rays: Stars
spellingShingle Radio continuum: Stars
X-rays: Stars
Rodríguez, L.F.
Mirabel, I.F.
Repeated relativistic ejections in GRS 1915 + 105
topic_facet Radio continuum: Stars
X-rays: Stars
description In 1994 February - August we observed with the VLA four ejection events of radio-emitting clouds from the high-energy source GRS 1915 + 105. These events are all consistent with antiparallel ejections of twin pairs of clouds moving away from the compact source at ∼0.92 of the speed of light and angles of ∼70° with respect to the line of sight. The flux ratios and time evolution of the expelled clouds are consistent with actual motions of the radiating matter rather than with the simple propagation of pulses in a medium moving at slower velocities. The large kinetic power of the sudden, short, and rather discontinuous ejections exceeds by more than an order of magnitude the maximum steady photon luminosity of the source, suggesting that in GRS 1915 + 105 a radiation acceleration mechanism of the ejecta is unlikely. As in other galactic and extragalactic radio sources, the decrease in flux density as a function of angular separation from the central source shows a steepening with distance. Additional ejection events have been observed in 1995 and 1997 and we compare them with the 1994 events.
format JOUR
author Rodríguez, L.F.
Mirabel, I.F.
author_facet Rodríguez, L.F.
Mirabel, I.F.
author_sort Rodríguez, L.F.
title Repeated relativistic ejections in GRS 1915 + 105
title_short Repeated relativistic ejections in GRS 1915 + 105
title_full Repeated relativistic ejections in GRS 1915 + 105
title_fullStr Repeated relativistic ejections in GRS 1915 + 105
title_full_unstemmed Repeated relativistic ejections in GRS 1915 + 105
title_sort repeated relativistic ejections in grs 1915 + 105
url http://hdl.handle.net/20.500.12110/paper_0004637X_v511_n1PART1_p398_Rodriguez
work_keys_str_mv AT rodriguezlf repeatedrelativisticejectionsingrs1915105
AT mirabelif repeatedrelativisticejectionsingrs1915105
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