The HELLAS survey. Probing the existence of a dichotomy between optical and X-ray classification
Author(s)
Vignali, C.
Comastri, A.
Fiore, F.
Date Issued
2001-01-01
Mission(s)
Abstract
The main properties of the HELLAS survey are briefly outlined. In particular, the suggestion of a dichotomy between the optical and the X-ray classification will be discussed. A comparison between the HELLAS sources soft X-ray properties and the ROSAT-selected objects is also described.