Chandra X-ray counterpart of KS 1741–293

¹ Departamento de Física, EPS, Universidad de Jaén, Campus Las Lagunillas s/n, A3, 23071 Jaén, Spain e-mail: [jmarti;jcombi;dperez;jlg]@ujaen.es
² Grupo de Investigación FQM-322, Universidad de Jaén, Campus Las Lagunillas s/n, A3, 23071 Jaén, Spain e-mail: ajmunoz@ujaen.es; jrssutil@hotmail.com
³ Dpto. de Ing. Mecánica y Minera, EPS, Universidad de Jaén, Campus Las Lagunillas s/n, A3, 23071 Jaén, Spain e-mail: peter@ujaen.es

Received: 21 September 2006
Accepted: 13 October 2006

Abstract

Aims.We aim to investigate the nature of the high energy source KS 1741-293 by revisiting the radio and infrared associations proposed in the early 1990s.

Methods.Our work is mostly based on the analysis of modern survey and archive data, including the NRAO, MSX, 2MASS and Chandra archives, and catalogues. We also have obtained deep CCD optical observations by ourselves.

Results.The coincidence of KS 1741-293 with an extended radio and far-infrared source, tentatively suggested in 1994, is no longer supported by modern observational data. Instead, a Chandra source is the only peculiar object found to be consistent with all high-energy error circles of KS 1741-293 and we propose it to be its most likely X-ray counterpart. We also report the existence of a non-thermal radio nebula in the vicinity of the KS 1741-293 position with the appearance of a supernova remnant. The possibility of being associated to this X-ray binary is discussed.