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Astron. Astrophys. 349, L21-L24 (1999)

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Letter to the Editor

BeppoSAX observations of the EXS 1737.9-2952 region

I. Discovery of new X-ray sources

J. Huovelin 1, J. Schultz 1, O. Vilhu 1, D. Hannikainen 1, P. Muhli 1 and Ph. Durouchoux 2

1 Observatory, P.O. Box 14, FIN-00014 University of Helsinki, Finland
2 C.E. Saclay, DSM, DAPNIA, Service d'Astrophysique, F-91191 Gif-Sur-Yvette Cedex, France

Received 24 June 1999 / Accepted 12 August 1999


We have observed the region centered on the hard X-ray transient EXS 1727.9-2952 near the Galactic Centre using the Narrow Field Instruments (NFI) of the BeppoSAX X-ray satellite. The soft X-ray intensity distribution in the full field of the MECS instruments revealed the existence of 10 sources. Three of them are within the [FORMULA] error circle of the EXS 1737.9-2952 nominal position. With a [FORMULA] flux collection radius, the individual background-subtracted source count rates were 0.0069-0.0162 cts/s with the MECS 2 and 3 data combined, indicating source flux densities of the order [FORMULA] erg cm- 2 s-1 (1.65-10.5 keV). The non-detections in LECS observations indicate that the sources are very weak in the 0.1-2 keV energy range. The locations of the new sources overlap partly with that of the CO molecular cloud observed by us with the SEST telescope at ESO. A few of the new sources are close to the VLA radio sources previously found inside the EXITE error circle of the EXS position, but none of them coincide.

Key words: Galaxy: center – X-rays: general – X-rays: stars

Send offprint requests to: J. Huovelin

© European Southern Observatory (ESO) 1999

Online publication: August 25, 1999