Benvenuti nell'Anagrafe della Ricerca d'Ateneo
La valutazione delle attività di ricerca che si svolgono nelle università ha assunto un'importanza rilevante sia per l'intero sistema universitario sia all'interno di ogni singolo ateneo. Roma Tre si è quindi dotata di idonei strumenti informativi in grado di supportare al meglio le azioni di monitoraggio e di valutazione delle attività di ricerca svolte nei propri dipartimentied ha realizzato una Anagrafe della Ricerca di Ateneo.
EnglishWe 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.
| 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: | |
| 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 |
File in questo prodotto:
http://hdl.handle.net/11590/135184
Copyright © 2018