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pro vyhledávání: '"Collin, Suzy"'
Autor:
Collin, Suzy
The main properties of AGN are reviewed, focussing on the accretion process and on the question of whether AGN are the best factories of ultra high energy particles and photons. I recall the large differences between the accretion/ejection flows in s
Externí odkaz:
http://arxiv.org/abs/0811.1731
Autor:
Collin, Suzy, Zahn, Jean-Paul
Keplerian accretion discs around massive black holes (MBHs) are gravitationally unstable beyond a few hundredths of parsec and should collapse to form stars. Indeed an accretion/star formation episode took place a few millions years ago in the Galact
Externí odkaz:
http://arxiv.org/abs/0709.3772
Autor:
Collin, Suzy
Black hole masses in Active Galactic Nuclei have been determined in 35 objects through reverberation mapping of the emission line region. I mention some uncertainties of the method, such as the ``scale factor'' relating the Virial Product to the mass
Externí odkaz:
http://arxiv.org/abs/astro-ph/0612098
Autor:
Collin, Suzy
I recall how the discovery of quasars occurred more than forty years ago, and the strong debates marking out their story. It led to the discovery of Massive Black Holes, which are now known to be present in almost all galaxies, and it opened on a coh
Externí odkaz:
http://arxiv.org/abs/astro-ph/0604560
Publikováno v:
Astron.Astrophys.456:75-90,2006
We try to identify the sources and systematics of the uncertainty of the masses of the central black holes in active galactic nuclei (AGNs) which have been obtained by reverberation-mapping methods. We characterize the broad H$\beta$ emission-line pr
Externí odkaz:
http://arxiv.org/abs/astro-ph/0603460
Autor:
Chevallier, Loïc, Collin, Suzy, Dumont, Anne-Marie, Czerny, Bozena, Mouchet, Martine, Gonçalves, Anabela C., Goosmann, René
The 2-10 keV continuum of AGN is well represented by a single power law, generally attributed to a hot comptonizing medium, such as a corona above the accretion disk. At smaller energies the continuum displays an excess with respect to the extrapolat
Externí odkaz:
http://arxiv.org/abs/astro-ph/0510700
Publikováno v:
Astron.Astrophys. 426 (2004) 767-776
In a previous article, with a new code designed for a photoionized thick hot medium using a full transfer treatment of both lines and continuum, we have studied the He-like emission of a medium photoionized by an X-ray source. We considered the influ
Externí odkaz:
http://arxiv.org/abs/astro-ph/0407607
Publikováno v:
Astron.Astrophys. 419 (2004) 877-886
With the advent of the present and future spatial X-ray missions, it becomes crucial to model correctly the line spectrum of X-ray emitting media. We have built a photoionization code, Titan, solving the transfer of a thousand lines and of the contin
Externí odkaz:
http://arxiv.org/abs/astro-ph/0403009
Publikováno v:
Astron.Astrophys. 414 (2004) 979-992
Using the new version of the photoionization code Titan designed for plane-parallel photoionized thick hot media, which is unprecedented from the point of view of line transfer, we have undertaken a study of the influence of different parameters on t
Externí odkaz:
http://arxiv.org/abs/astro-ph/0310705
Autor:
Dumont, Anne-Marie, Collin, Suzy
We describe a code designed for hot media {(T $\ge$} a few 10$^4$ K), optically thick to Compton scattering. It computes the structure of a plane-parallel slab of gas in thermal and ionization equilibrium, illuminated on one side or on both sides by
Externí odkaz:
http://arxiv.org/abs/astro-ph/0103317