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Astron. Astrophys. 363, 184-187 (2000)


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Research Note

VLT search for the infrared counterpart of 1E 1740.7-2942

J. Martí 1, I.F. Mirabel 2,3, S. Chaty 4 and L.F. Rodríguez 5

1 Departamento de Física, Escuela Politécnica Superior, Universidad de Jaén, Calle Virgen de la Cabeza, 2, 23071 Jaén, Spain
2 CEA/DSM/DAPNIA/Service d'Astrophysique, Centre d'Études de Saclay, 91191 Gif-Sur-Yvette, France
3 Instituto de Astronomía y Física del Espacio, C.C. 67, Suc. 28, 1428 Buenos Aires, Argentina
4 Physics Department, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK
5 Instituto de Astronomía, UNAM, Campus Morelia, Apdo. Postal 3-72, 58089 Morelia, Michoacán, México

Received 4 August 2000 / Accepted 14 August 2000

Abstract

We report the results of our search for the near infrared counterpart of the microquasar 1E 1740.7-2942 using the VLT 1. For the first time, several counterpart candidates have been found in our Ks-band images that may be consistent with the best radio and X-ray positions available for 1E 1740.7-2942. However, the non-detection of variability between two observing epochs and the positional uncertainty still remaining at the [FORMULA][FORMULA] level prevent us from identifying an unambiguous counterpart. Alternatively, the VLT images set new upper limits significantly deeper than previously reported that constrain the binary companion to be later than B8 V or earlier than G5 III.

Key words: stars: individual: 1E 1740.7 – 2942 – Galaxy: center – infrared: stars – radio continuum: stars – X-rays: stars

Send offprint requests to: J. Martí (jmarti@ujaen.es)

© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000

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