11 papers
AGNs among ROSAT Blank Field Sources
I. Cagnoni, M. Elvis, D. -W. Kim +3
We selected a sample of sources with high X-ray over optical flux ratio from the ROSAT PSPC archives. Out of the 16 sources in our sample, one is a (possibly extreme) BL Lac and tw…
XMM-Newton detection of warm/hot integalactic medium at z~0.01
Ilaria Cagnoni
We report a ~3 sigma detection of a 21.82 A absorption feature in the direction of the BL Lac MRK 421 which is interpreted as OVII K(alpha) at z~0.01. This corresponds to the redsh…
Clusters of galaxies among ROSAT blank field sources
I. Cagnoni, M. Elvis, D. -W. Kim +3
We present here an efficient method for selecting high luminosity and massive high redshift clusters of galaxies, crucially important tools in cosmology. By selecting bright and ex…
The ASCA HSS: Looking for Type 2 AGN
R. Della Ceca, V. Braito, V. Beckmann +2
We will briefly discuss the X-ray spectral properties of the objects in the ASCA Hard Serendipitous Survey (HSS) sample and its present AGN contents. We also present X-ray spectros…
The ASCA Hard Serendipitous Survey
R. Della Ceca, V. Braito, I. Cagnoni +1
We summarize here some of the main results we have reached so far in the ASCA Hard Serendipitous Survey, a survey program conducted in the 2-10 keV energy band. In particular we wi…
SISSA Searching for blazars: the BLEIS project
Ilaria Cagnoni, Annalisa Celotti, Davide Poccecai
We present the aim and the status of the BLEIS project currently under development at SISSA. This project consists in selecting a complete Blazar sample from deep optical data, dow…