Identification of the optical and near-infrared counterpart of GRS 1758-258

Context. Understood to be a microquasar in the Galactic center region, GRS 1758-258 has not yet been unambiguously identified to have an optical/near-infrared counterpart, mainly because of the high absorption and the historic lack of suitable astrometric stars, which led to the use of secondary ast...

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Detalles Bibliográficos
Publicado: 2010
Materias:
Infrared: general
Radio continuum: stars
X-rays: binaries
X-rays: stars
1E 1740.7-2942
Archival image
Emission lines
Extragalactic origin
Galactic Center region
Infrared source
Low signal-to-noise ratio
Near Infrared
Near-infrared wavelength
Radio data
Spectral observations
X rays: stars
X-rays: Binaries
Infrared devices
Light sources
Signal to noise ratio
X rays
Stars
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v519_n1_p_MunozArjonilla
http://hdl.handle.net/20.500.12110/paper_00046361_v519_n1_p_MunozArjonilla
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00046361_v519_n1_p_MunozArjonilla
record_format dspace
spelling paper:paper_00046361_v519_n1_p_MunozArjonilla2023-06-08T14:27:53Z Identification of the optical and near-infrared counterpart of GRS 1758-258 Infrared: general Radio continuum: stars X-rays: binaries X-rays: stars 1E 1740.7-2942 Archival image Emission lines Extragalactic origin Galactic Center region Infrared source Infrared: general Low signal-to-noise ratio Near Infrared Near-infrared wavelength Radio continuum: stars Radio data Spectral observations X rays: stars X-rays: Binaries Infrared devices Light sources Signal to noise ratio X rays Stars Context. Understood to be a microquasar in the Galactic center region, GRS 1758-258 has not yet been unambiguously identified to have an optical/near-infrared counterpart, mainly because of the high absorption and the historic lack of suitable astrometric stars, which led to the use of secondary astrometric solutions. Although it is considered with 1E 1740.7-2942 as the prototypical microquasar in the Galactic center region, the Galactic origin of both sources has not yet been confirmed. Aims. We attempt to improve previous astrometry to identify a candidate counterpart to GRS 1758-258. We present observations with the Gran Telescopio de Canarias (GTC), in which we try to detect any powerful emission lines that would infer an extragalactic origin of this source. Methods. We use modern star catalogues to reanalyze archival images of the GRS 1758-258 field in the optical and near-infrared wavelengths, and compute a new astrometric solution. We also reanalyzed archival radio data of GRS 1758-258 to determine a new and more accurate radio position. Results. Our improved astrometric solution for the GRS 1758-258 field represents a significant advancement on previous works and allows us to identify a single optical/near-infrared source, which we propose as the counterpart of GRS 1758-258. The GTC spectrum of this source is however of low signal-to-noise ratio and does not rule out a Galactic origin. Hence, new spectral observations are required to confirm or discard a Galactic nature. © 2010 ESO. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v519_n1_p_MunozArjonilla http://hdl.handle.net/20.500.12110/paper_00046361_v519_n1_p_MunozArjonilla
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Infrared: general
Radio continuum: stars
X-rays: binaries
X-rays: stars
1E 1740.7-2942
Archival image
Emission lines
Extragalactic origin
Galactic Center region
Infrared source
Infrared: general
Low signal-to-noise ratio
Near Infrared
Near-infrared wavelength
Radio continuum: stars
Radio data
Spectral observations
X rays: stars
X-rays: Binaries
Infrared devices
Light sources
Signal to noise ratio
X rays
Stars
spellingShingle Infrared: general
Radio continuum: stars
X-rays: binaries
X-rays: stars
1E 1740.7-2942
Archival image
Emission lines
Extragalactic origin
Galactic Center region
Infrared source
Infrared: general
Low signal-to-noise ratio
Near Infrared
Near-infrared wavelength
Radio continuum: stars
Radio data
Spectral observations
X rays: stars
X-rays: Binaries
Infrared devices
Light sources
Signal to noise ratio
X rays
Stars
Identification of the optical and near-infrared counterpart of GRS 1758-258
topic_facet Infrared: general
Radio continuum: stars
X-rays: binaries
X-rays: stars
1E 1740.7-2942
Archival image
Emission lines
Extragalactic origin
Galactic Center region
Infrared source
Infrared: general
Low signal-to-noise ratio
Near Infrared
Near-infrared wavelength
Radio continuum: stars
Radio data
Spectral observations
X rays: stars
X-rays: Binaries
Infrared devices
Light sources
Signal to noise ratio
X rays
Stars
description Context. Understood to be a microquasar in the Galactic center region, GRS 1758-258 has not yet been unambiguously identified to have an optical/near-infrared counterpart, mainly because of the high absorption and the historic lack of suitable astrometric stars, which led to the use of secondary astrometric solutions. Although it is considered with 1E 1740.7-2942 as the prototypical microquasar in the Galactic center region, the Galactic origin of both sources has not yet been confirmed. Aims. We attempt to improve previous astrometry to identify a candidate counterpart to GRS 1758-258. We present observations with the Gran Telescopio de Canarias (GTC), in which we try to detect any powerful emission lines that would infer an extragalactic origin of this source. Methods. We use modern star catalogues to reanalyze archival images of the GRS 1758-258 field in the optical and near-infrared wavelengths, and compute a new astrometric solution. We also reanalyzed archival radio data of GRS 1758-258 to determine a new and more accurate radio position. Results. Our improved astrometric solution for the GRS 1758-258 field represents a significant advancement on previous works and allows us to identify a single optical/near-infrared source, which we propose as the counterpart of GRS 1758-258. The GTC spectrum of this source is however of low signal-to-noise ratio and does not rule out a Galactic origin. Hence, new spectral observations are required to confirm or discard a Galactic nature. © 2010 ESO.
title Identification of the optical and near-infrared counterpart of GRS 1758-258
title_short Identification of the optical and near-infrared counterpart of GRS 1758-258
title_full Identification of the optical and near-infrared counterpart of GRS 1758-258
title_fullStr Identification of the optical and near-infrared counterpart of GRS 1758-258
title_full_unstemmed Identification of the optical and near-infrared counterpart of GRS 1758-258
title_sort identification of the optical and near-infrared counterpart of grs 1758-258
publishDate 2010
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v519_n1_p_MunozArjonilla
http://hdl.handle.net/20.500.12110/paper_00046361_v519_n1_p_MunozArjonilla
_version_ 1768545029819727872

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