We have obtained relatively deep (R=24-25) optical images for all 122 hard X-ray sources in the HELLAS2XMM 1dF sample using EFOSC2 at the ESO 3.6 m telescope and DOLORES at the TNG. Exposures were typically of 10min per image. Optical frames and X-ray images were brought to a common astrometric reference frame using bright AGN (from 5 to 15 AGN per field). Typical systematic shifts were of the order of 1", the maximum shift was of ~2". Optical spectra of 97 of the 110 sources with optical counterparts brighter than R=24 have been obtained using EFOSC2 at the ESO 3.6m telescope and FORS1 at VLT/UT1 during 5 observing runs performed between Jan. 2000 and Aug. 2002. A total of 9 nights at the 3.6m and 24h of VLT time have been devoted to this program.
Fiore, F., Brusa, M., Cocchia, F., Baldi, A., Carangelo, N., Ciliegi, P., et al. (2003). HELLAS2XMM survey. IV.
HELLAS2XMM survey. IV
LA FRANCA, Fabio;Matt G;
2003-01-01
Abstract
We have obtained relatively deep (R=24-25) optical images for all 122 hard X-ray sources in the HELLAS2XMM 1dF sample using EFOSC2 at the ESO 3.6 m telescope and DOLORES at the TNG. Exposures were typically of 10min per image. Optical frames and X-ray images were brought to a common astrometric reference frame using bright AGN (from 5 to 15 AGN per field). Typical systematic shifts were of the order of 1", the maximum shift was of ~2". Optical spectra of 97 of the 110 sources with optical counterparts brighter than R=24 have been obtained using EFOSC2 at the ESO 3.6m telescope and FORS1 at VLT/UT1 during 5 observing runs performed between Jan. 2000 and Aug. 2002. A total of 9 nights at the 3.6m and 24h of VLT time have been devoted to this program.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
