Zobrazeno 1 - 10
of 211
pro vyhledávání: '"GIOIA I."'
Autor:
Balmaverde, B., Caccianiga, A., Della Ceca, R., Wolter, A., Belfiore, A., Ballo, L., Berton, M., Gioia, I., Maccacaro, T., Sbarufatti, B.
The REX (Radio-Emitting X-ray sources) is a catalogue produced by cross-matching X-ray data from the ROSAT-PSPC archive of pointed observations and radio data from the NRAO VLA Sky Survey, aimed at the selection of blazars. From the REX catalogue, we
Externí odkaz:
http://arxiv.org/abs/1912.07613
We use the ROSAT North Ecliptic Pole (NEP) survey to construct a small, but purely X-ray flux-limited sample of cataclysmic variable stars (CVs). The sample includes only 4 systems, 2 of which (RX J1715.6+6856 and RX J1831.7+6511) are new discoveries
Externí odkaz:
http://arxiv.org/abs/0709.1887
The current generation of X-ray observatories like Chandra allows studies with very fine spatial details. It is now possible to resolve X-ray point sources projected into the cluster diffuse emission and exclude them from the analysis to estimate the
Externí odkaz:
http://arxiv.org/abs/0706.3272
In this paper we re-visit the observational relation between X-ray luminosity and temperature for high-z galaxy clusters and compare it with the local L_X-T and with theoretical models. To these ends we use a sample of 17 clusters extracted from the
Externí odkaz:
http://arxiv.org/abs/0706.3277
Autor:
Cappelluti, N., Boehringer, H., Schuecker, P., Pierpaoli, E., Mullis, C. R., Gioia, I. M., Henry, J. P.
X-ray surveys facilitate investigations of the environment of AGNs. Deep Chandra observations revealed that the AGNs source surface density rises near clusters of galaxies. The natural extension of these works is the measurement of spatial clustering
Externí odkaz:
http://arxiv.org/abs/0704.2285
Autor:
Cappelluti, N., Boehringer, H., Schuecker, P., Pierpaoli, E., Mullis, C. R., Gioia, I. M., Henry, J. P.
X-ray surveys facilitate investigations of the environment of AGNs. Deep Chandra observations revealed that the AGNs source surface density rises near clusters of galaxies. The natural extension of these works is the measurement of spatial clustering
Externí odkaz:
http://arxiv.org/abs/astro-ph/0611553
With the superb angular resolution of the Chandra Observatory, it is now possible to detect X-ray point sources, either embedded in galaxy clusters or along the cluster line of sight, which could not be resolved by previous instruments. This now allo
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610790
We present in this paper optical and X-ray follow up observations for three X-ray selected objects extracted from the ROSAT North Ecliptic Pole survey which is a flux-limited, completely identified survey. All three objects have X-ray luminosities in
Externí odkaz:
http://arxiv.org/abs/astro-ph/0510045
A complete sample of 18 X-ray selected clusters of galaxies belonging to the ROSAT North Ecliptic Pole (NEP) survey has been observed with the Very Large Array at 1.4 GHz. These are the most distant clusters in the X-ray survey with redshift in the r
Externí odkaz:
http://arxiv.org/abs/astro-ph/0509138
Autor:
Mullis, C. R., Henry, J. P., Gioia, I. M., Boehringer, H., Briel, U. G., Voges, W., Huchra, J. P.
Publikováno v:
Astrophys.J. 617 (2004) 192-208
We present a detailed description of the first direct measurement of the spatial correlation function of X-ray selected AGN. This result is based on an X-ray flux-limited sample of 219 AGN discovered in the contiguous 80.7 deg^2 region of the ROSAT N
Externí odkaz:
http://arxiv.org/abs/astro-ph/0408304