106 citations · 356 across the 25 of their papers we have counts for
5 papers · 1 filter
Variability of ultraluminous X-ray sources in the Cartwheel Ring
A. Wolter, G. Trinchieri, M. Colpi
The Cartwheel is one of the most outstanding examples of a dynamically perturbed galaxy where star formation is occurring inside the ring--like structure. In previous studies with…
On the compact nature of the most luminous ULX in the Cartwheel ring
A. Wolter, G. Trinchieri, M. Colpi
We report the first detection of flux variability in the most luminous X-ray source in the southern ring of the Cartwheel galaxy. XMM--Newton data show that the luminosity has vari…
Unobscured QSO2: A New Class of Objects?
A. Wolter, I. M. Gioia, J. P. Henry +1
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, comp…
A sample of X-ray emitting normal galaxies from the BMW -- HRI Catalogue
M. Tajer, G. Trinchieri, A. Wolter +3
We have obtained a sample of 143 normal galaxies with X-ray luminosity in the range erg s from the cross-correlation of the ROSAT HRI Brera Multi-scale W…
RXJ 1821.6+6827: a Cool Cluster at z=0.81 from the ROSAT NEP Survey
I. M. Gioia, A. Wolter, C. R. Mullis +3
We present an analysis of the properties of the cluster of galaxies RXJ 1821.6+6827, or NEP 5281, at a redshift z=0.816+/-0.001. RXJ 1821.6+6827 was discovered during the optical i…