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2001ApJ...554...18A - Astrophys. J., 554, 18-26 (2001/June-2)
The European Large-Area Infrared Space Observatory survey V: a BeppoSAX hard X-ray survey of the S1 region.
ALEXANDER D.M., LA FRANCA F., FIORE F., BARCONS X., CILIEGI P., DANESE L., DELLA CECA R., FRANCESCHINI A., GRUPPIONI C., MATT G., MATUTE I., OLIVER S., POMPILIO F., WOLTER A., EFSTATHIOU A., HERAUDEAU P., PEROLA G.C., PERRI M., RIGOPOULOU D., ROWAN-ROBINSON M.A. and SERJEANT S.
Abstract (from CDS):
The BAL QSO has an observed X-ray softness ratio and HX/MIR flux ratio similar to those of QSOs but different from those found for low-redshift BAL QSOs. This difference can be explained in terms of absorption, and it suggests that high-redshift BAL QSOs should be comparatively easy to detect in the HX band, allowing their true fraction in the high-redshift QSO population to be determined. The QSOs cover a wide redshift range (0.4<z<2.6) and have HX/MIR flux ratios consistent with those found for nearby IRAS and optically selected Palomar-Green QSOs. This suggests that MIR-selected QSOs of R<20 mag come from the same population as optically selected QSOs. We confirm this with a comparison of the B/MIR flux ratios of MIR and blue-band-selected QSOs.
Abstract Copyright: ∼
Journal keyword(s): Cosmology: Observations - Galaxies: Active - Infrared: Galaxies - Surveys - X-Rays: Galaxies
Nomenclature: Table 2: [ALF2001] NN (Nos 1-11). Table 3: [ALF2001] sN (Nos s1-s4).
Simbad objects: 21
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