The observations used were carried out with the PSPC detector of the ROSAT observatory during two pointed observations in May-June and November 1992. The satellite, X-ray telescope (XRT) and the focal plane detector (PSPC ) are described in detail in Trümper (1983) and Pfeffermann et al. (1986). We note that no observations have been performed in the direction of NGC 3109 with the HRI detector of ROSAT .
The data of the two pointings given in Table 1 have been retrieved from the public ROSAT archive. The data sets from the two observations have been merged to one data set using standard EXSAS procedures (Zimmermann et al. 1994).
Table 1. Data of pointings on NGC 3109
© European Southern Observatory (ESO) 2000
Online publication: October 2, 2000