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Measurement of Mass and Spin of Black Holes with QPOs
Aschenbach, B.
There are now four low mass X-ray binaries with black holes which show twin resonant-like HFQPOs. Similar QPOs might have been found in Sgr A*. I review the power spectral density distributions of the three X-ray flares and the six NIR flares published for Sgr A* so far, in order to look for more similarities than just the frequencies between the …
Spectral Analysis of LMC-X2 with XMM/Newton
Robba, N. R.; Iaria, R.; di Salvo, T. +2 more
We present the results of the analisys of an archival observation of LMC X-2 performed with XMM/Newton. The spectra of this source has never been analyzed with a high precision instrument before. The spectrum of the source can be fitted with a blackbody with a temperature 1.5 keV plus a disk blackbody at 0.8 keV. We argue that the emission of this…
High-Energy Astrophysics and the Virtual Observatory
Padovani, Paolo
The Virtual Observatory (VO) will revolutionise the way we do Astronomy by allowing easy access to all astronomical data and by making the handling and analysis of datasets at various locations across the globe much simpler and faster. I report here on the need for the VO and its status in Europe, concentrating on the recently started EURO-VO proj…
The Properties of the Absorbing and Line Emitting Material in IGR J16318-4848
Guainazzi, M.; Matt, Giorgio
We analyzed the 2003 Target of Opportunity XMM-Newton observation of IGR J16318-4848, to derive the properties of the matter responsible for the obscuration and for the emission of Fe and Ni lines. The line of sight material has a column density of about 2×1024 cm-2 but, from the Fe Kα line EW and Compton Shoulder, we argue t…
Broad Iron Lines in Active Galactic Nuclei
Reynolds, C. S.; Kendziorra, E.; Wilmsn, J.
The Fe Kα lines seen in many Active Galactic Nuclei (AGN) are thought to originate close to the central supermassive black hole. In this review we summarize the physics of the fluorescent line formation and show that Fe Kα line profile observations can be used to probe relativistic effects in the vicinity of the black hole, concentrating on recent…