6 papers · 1 filter
The X-ray luminosity function of galaxies and its evolution
I. Georgantopoulos, P. Tzanavaris
We compile one of the largest ever samples to probe the X-ray normal galaxy luminosity function and its evolution with cosmic time. In particular, we select 207 galaxies (106 late…
The XMM-2df Cluster Survey
T. Gaga, M. Plionis, I. Georgantopoulos +5
We present the results from a shallow (2-10 ksec) XMM/2dF survey. Our survey covers 18 XMM fields () previously spectroscopically followed up with the Anglo-Aus…
QSO Photometric Redshift estimation for the XMM-Newton/2dF Survey
S. Kitsionas, E. Hatziminaoglou, I. Georgantopoulos +2
The technique of estimating redshifts using photometric rather than spectroscopic observations has recently received great attention due to its simplicity and the accuracy of the r…
SHEEP: the ASCA 5-10 keV survey
I. Georgantopoulos, K. Nandra, A. Ptak
We present the first results of the hard (5-10 keV) ASCA GIS survey SHEEP (Search for the High Energy Extragalactic Population). We have analysed 149 fields covering an area of 39…
Testing for substructure in optical and X-ray clusters
Vaggelis Kolokotronis, Spyros Basilakos, Manolis Plionis +1
We present a detailed study of the morphological features of 22 rich galaxy clusters. We systematically compare cluster images and morphological parameters in an attempt to reliabl…
The discovery of a high redshift type 2 QSO
O. Almaini, B. J. Boyle, R. E. Griffiths +3
We report the discovery of a high redshift, narrow emission-line galaxy identified in the optical follow-up of deep ROSAT fields. The object has a redshift of z=2.35 and its narrow…