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79 records were found.

Comment: 19 pages, 15 figures, 3 tables. Accepted for publication in MNRAS
Comment: 8 pages: 4 pages of main text + 5 postscript figures, use aastex. Accepted for publication in ApJL. Replaced with the proof version (added missing references and corrected a few sentences)
Comment: 4 pages. Proceeding of the conference "Studying Galaxy Evolution with Spitzer and Herschel", Crete, May 28 - June 2, 2006. Eds. V. Charmandaris, D. Rigopoulou, N. Kylafis
Recent works have suggested that selection criteria based on mid-IR properties, i.e. extreme colors and bright flux levels, can be used to reveal a population of dust-enshrouded, extremely-luminous quasars at z ~ 1–2. However, the X-ray spectral properties of these intriguing objects still remain largely unexplored. We have performed an X-ray study of a large sample of bright mid-IR (F_(24 μm) > 1.3 mJy) galaxies showing an extreme MIR/Optical flux ratio (F_(24 μm)/F_R > 2000) in order to confirm the presence of a luminous active nucleus in these very red objects. Sampling of a large area is required to pick up objects at the highest luminosities given their low surface density. Accordingly, we have applied our selection criteria to an area of ~6 deg^2 covered by XMM-Newton/Chandra observations within the ~50 deg^2 SWIRE survey, result...
Comment: 3 pages, to appear in the proceedings of the Fourth Italian Conference on AGNs (MemSAIt)
Comment: 11 pages, 8 Postscripts figures, 6 tables, accepted for publication on A&A, minor typos corrected
Comment: 14 pages, 10 figures. Accepted for publication in Astronomy & Astrophysics
Comment: 15 pages LaTeX file, 3 postscript figures. Uses elsart.sty and elsart.cls Accepted for publication in New Astronomy
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