Showing astro-phShow all
3 papers · 1 filter
astro-ph2000
Blank Field X-Ray Sources
Ilaria Cagnoni, Annalisa Celotti, Martin Elvis +2
The X-ray sky is not as well known as is sometimes thought. We report on our search of minority populations (Kim & Elvis 1999). One of the most intriguing is that of `blank field s…
astro-ph1998
Intergalactic H_2 Photodissociation and the Soft UV Background Produced by Population III Objects
Benedetta Ciardi, Andrea Ferrara, Tom Abel
We study the effects of the ionizing and dissociating photons produced by PopIII objects on the surrounding intergalactic medium. We find that the typical size of a H_2 photodissoc…
astro-ph1998
EUVE-RXTE simultaneous observations of NGC 4051: variability and spectrum
I. Cagnoni, A. Fruscione, I. M. McHardy +1
We present timing and spectral analysis of the data collected by the Extreme Ultraviolet Explorer Satellite (EUVE) for the Seyfert 1 galaxy NGC 4051 during 1996. NGC 4051 was obser…