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The BeppoSAX HELLAS survey: the nature of the hard X‐ray selected sources
Author(s) -
Fiore F.,
La Franca F.
Publication year - 1999
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/1521-3994(199908)320:4/5<253::aid-asna253>3.0.co;2-#
Subject(s) - astrophysics , x ray , physics , astronomy , nuclear physics
The BeppoSAX High Energy Large Area Survey (HELLAS) has found so far 200 sources with a 5‐10 flux higher than 5 × 10 —14 erg cm —2 s —1 in ∼ 80 deg 2 of sky. A summary on the optical identifications of a subsample of these sources is presented here. Most of the identified sources are AGN at 0.04