Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1295...94z&link_type=abstract
THE THIRD ALGERIAN WORKSHOP ON ASTRONOMY AND ASTROPHYSICS. AIP Conference Proceedings, Volume 1295, pp. 94-100 (2010).
Astronomy and Astrophysics
Astrophysics
Black Holes, X-Ray Emission Spectra, Active Galaxies, Spectral Analysis, Corona, Galactic Nuclei, Circumnuclear Matter, And Bulges, X-Ray Sources, X-Ray Bursts, Active And Peculiar Galaxies And Related Systems, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification, Coronal Holes
Scientific paper
Black holes are the most powerful single objects known in the universe. They emit a colossal amount of energy across the electromagnetic spectrum, and understanding their physics is a key challenge for modern astrophysics. In this work, we briefly review the current understanding of black holes and their X-ray emission, and we discuss some recent results on the detection of a reverberation signal from a black hole in X-rays. It is based on a long observation from the X-ray space observatory XMM-Newton. Using earlier spectral modelling of atomic processes and light curve analysis techniques, we find that there is a time delay of about 30 seconds between two components of the spectrum emitted from separate regions very close to the black hole. This is not just the first significant lag to be detected from a black hole, but also it means we are now probing the physics closer to the event horizon than any time before.
Fabian Andy
Zoghbi Abderahmen
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