Zobrazeno 1 - 10
of 573
pro vyhledávání: '"Barcons, X."'
Autor:
Mateos, S., Carrera, F. J., Barcons, X., Alonso-Herrero, A., Hernán-Caballero, A., Page, M., Almeida, C. Ramos, Caccianiga, A., Miyaji, T., Blain, A.
Dedicated searches generally find a decreasing fraction of obscured Active Galactic Nuclei (AGN) with increasing AGN luminosity. This has often been interpreted as evidence for a decrease of the covering factor of the AGN torus with increasing lumino
Externí odkaz:
http://arxiv.org/abs/1705.04323
Autor:
Ordovás-Pascual, I., Mateos, S., Carrera, F. J., Wiersema, K., Barcons, X., Braito, V., Caccianiga, A., Del Moro, A., Della Ceca, R., Severgnini, P.
Approximately 3-17 percent of Active Galactic Nuclei (AGN) without detected rest-frame UV/optical broad emission lines (type-2 AGN) do not show absorption in X-rays. The physical origin behind the apparently discordant optical/X-ray properties is not
Externí odkaz:
http://arxiv.org/abs/1704.01595
Autor:
Mateos, S., Carrera, F. J., Alonso-Herrero, A., Hernán-Caballero, A., Barcons, X., Ramos, A. Asensio, Watson, M. G., Blain, A., Caccianiga, A., Ballo, L., Braito, V., Almeida, C. Ramos
We present the distributions of geometrical covering factors of active galactic nuclei (AGNs) dusty tori (f2) using an X-ray selected complete sample of 227 AGN drawn from the Bright Ultra-hard XMM-Newton Survey. The AGN have z from 0.05 to 1.7, 2-10
Externí odkaz:
http://arxiv.org/abs/1601.04439
Autor:
Mateos, S., Carrera, F. J., Alonso-Herrero, A., Rovilos, E., Hernán-Caballero, A., Barcons, X., Blain, A., Caccianiga, A., Della Ceca, R., Severgnini, P.
We have determined the relation between the AGN luminosities at rest-frame 6 {\mu}m associated to the dusty torus emission and at 2-10 keV energies using a complete, X-ray flux limited sample of 232 AGN drawn from the Bright Ultra-hard XMM-Newton Sur
Externí odkaz:
http://arxiv.org/abs/1501.04335
Publikováno v:
A&A 568, A15 (2014)
The X-ray spectra of active galactic nuclei (AGN) unveil properties of matter around the super massive black hole (SMBH). We investigate the X-ray spectra of AGN focusing on Compton reflection and fluorescence, important processes of interaction betw
Externí odkaz:
http://arxiv.org/abs/1406.6009
Autor:
Barret, D., Nandra, K., Barcons, X., Fabian, A, Herder, J-W den, Piro, L., Watson, M., Aird, J., Branduardi-Raymont, G., Cappi, M., Carrera, F., Comastri, A., Costantini, E., Croston, J., Decourchelle, A., Done, C., Dovciak, M., Ettori, S., Finoguenov, A., Georgakakis, A., Jonker, P., Kaastra, J., Matt, G., Motch, C., O'Brien, P., Pareschi, G., Pointecouteau, E., Pratt, G., Rauw, G., Reiprich, T., Sanders, J., Sciortino, S., Willingale, R., Wilms, J.
The Advanced Telescope for High-energy Astrophysics (Athena+) is being proposed to ESA as the L2 mission (for a launch in 2028) and is specifically designed to answer two of the most pressing questions for astrophysics in the forthcoming decade: How
Externí odkaz:
http://arxiv.org/abs/1310.3814
Autor:
Barret, D., Herder, J. W. den, Piro, L., Ravera, L., Hartog, R. Den, Macculi, C., Barcons, X., Page, M., Paltani, S., Rauw, G., Wilms, J., Ceballos, M., Duband, L., Gottardi, L., Lotti, S., de Plaa, J., Pointecouteau, E., Schmid, C., Akamatsu, H., Bagliani, D., Bandler, S., Barbera, M., Bastia, P., Biasotti, M., Branco, M., Camon, A., Cara, C., Cobo, B., Colasanti, L., Costa-Kramer, J. L., Corcione, L., Doriese, W., Duval, J. M., Fabrega, L., Gatti, F., de Gerone, M., Guttridge, P., Kelley, R., Kilbourne, C., van der Kuur, J., Mineo, T., Mitsuda, K., Natalucci, L., Ohashi, T., Peille, P., Perinati, E., Pigot, C., Pizzigoni, G., Pobes, C., Porter, F., Renotte, E., Sauvageot, J. L., Sciortino, S., Torrioli, G., Valenziano, L., Willingale, D., de Vries, C., van Weers, H.
The Athena+ mission concept is designed to implement the Hot and Energetic Universe science theme submitted to the European Space Agency in response to the call for White Papers for the definition of the L2 and L3 missions of its science program. The
Externí odkaz:
http://arxiv.org/abs/1308.6784
Autor:
Castelló-Mor, N., Carrera, F. J., Alonso-Herrero, A., Mateos, S., Barcons, X., Ranalli, P., Pérez-González, P. G., Comastri, A., Vignali, C., Georgantopoulos, I.
Accretion onto SMBH is believed to occur mostly in obscured AGN. Such objects are proving rather elusive in surveys of distant galaxies, including those at X-ray energies. Our main goal is to determine whether the revised IRAC criteria of Donley et a
Externí odkaz:
http://arxiv.org/abs/1307.1471
Autor:
Georgakakis, A., Carrera, F., Lanzuisi, G., Brightman, M., Buchner, J., Aird, J., Page, M., Cappi, M., Afonso, J., Alonso-Herrero, A., Ballo, L., Barcons, X., Ceballos, M. T., Comastri, A., Georgantopoulos, I., Mateos, S., Nandra, K., Rosario, D., Salvato, M., Schawinski, K., Severgnini, P., Vignali, C.
Observations in the last decade have provided strong evidence that the growth of supermassive black holes at the centres of galaxies is among the most influential processes in galaxy evolution. Open questions that relate to our current understanding
Externí odkaz:
http://arxiv.org/abs/1306.2328
Autor:
Falocco, S., Carrera, F. J., Corral, A., Barcons, X., Comastri, A., Gilli, R., Ranalli, P., Vignali, C., Iwasawa, K., Cappelluti, N., Rovilos, E., Georgantopoulos, I., Brusa, M., Vito, F.
Publikováno v:
A&A 555, A79 (2013)
X-ray spectroscopy of active galactic nuclei (AGN) offers the opportunity to directly probe the inner regions of the accretion disk. We present the results of our analysis of average AGN XMM-Newton X-ray spectra in the Chandra Deep Field South observ
Externí odkaz:
http://arxiv.org/abs/1304.7690