We present a comprehensive study of the soft X-ray properties of the BeppoSA X High-Energy Large Area Survey (HELLAS) sources. A large fraction (about 2/3) of the hard X ray selected sources is detected by ROSAT. The soft X-ray colors for many of these objects, along with the 0.5-2 keV flux upper limits for those undetected in the ROSAT band, do imply the presence of absorption. The comparison with the ROSAT Deep Survey sources indicates that a larger fraction of absorbed objects among the HELLAS sources is present, in agreement with their hard X-ray selection and the predictions of the X-ray background synthesis: models. Another striking result is the presence, of a soft (additional) X-ray component in a significant fraction of absorbed objects.
Vignali C, Comastri A, Fiore F, & La Franca F (2001). The BeppoSAX High Energy Large Area Survey - IV. On the soft X-ray properties of the hard X-ray-selected HELLAS sources. ASTRONOMY & ASTROPHYSICS, 370(3), 900-908.
Titolo: | The BeppoSAX High Energy Large Area Survey - IV. On the soft X-ray properties of the hard X-ray-selected HELLAS sources | |
Autori: | ||
Data di pubblicazione: | 2001 | |
Rivista: | ||
Citazione: | Vignali C, Comastri A, Fiore F, & La Franca F (2001). The BeppoSAX High Energy Large Area Survey - IV. On the soft X-ray properties of the hard X-ray-selected HELLAS sources. ASTRONOMY & ASTROPHYSICS, 370(3), 900-908. | |
Abstract: | We present a comprehensive study of the soft X-ray properties of the BeppoSA X High-Energy Large Area Survey (HELLAS) sources. A large fraction (about 2/3) of the hard X ray selected sources is detected by ROSAT. The soft X-ray colors for many of these objects, along with the 0.5-2 keV flux upper limits for those undetected in the ROSAT band, do imply the presence of absorption. The comparison with the ROSAT Deep Survey sources indicates that a larger fraction of absorbed objects among the HELLAS sources is present, in agreement with their hard X-ray selection and the predictions of the X-ray background synthesis: models. Another striking result is the presence, of a soft (additional) X-ray component in a significant fraction of absorbed objects. | |
Handle: | http://hdl.handle.net/11590/135184 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |