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arxiv: astro-ph/0102428 · v1 · submitted 2001-02-24 · 🌌 astro-ph

The BeppoSAX High Energy Large Area Survey. IV. On the soft X-ray properties of the hard X-ray-selected HELLAS sources

C. Vignali (1 , 2) , A. Comastri (2) , F. Fiore (3 , 4) , F. La Franca (5) ((1) Dipartimento di Astronomia , Universita` di Bologna , (2) Osservatorio Astronomico di Bologna
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(3) Osservatorio Astronomico di Roma (4) BeppoSAX Science Data Center - Roma (5) Dipartimento di Fisica Universita` degli Studi "Roma Tre" - Roma)
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keywords x-raysourcessoftfractionhardhellaslargeobjects
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We present a comprehensive study of the soft X-ray properties of the BeppoSAX 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.

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