Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ycat..34090079f&link_type=abstract
VizieR On-line Data Catalog: J/A+A/409/79. Originally published in: 2003A&A...409...79F
Astronomy and Astrophysics
Astronomy
X-Ray Sources, Qsos
Scientific paper
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.
(1 data file).
Baldi Alessandro
Brusa Marcella
Carangelo Nicoletta
Ciliegi Paolo
Cocchia Filomena
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