Zobrazeno 1 - 10
of 493
pro vyhledávání: '"Pizzetti, P."'
Autor:
Sengupta, D., Torres-Albà, N., Pizzetti, A., López, I. E., Marchesi, S., Vignali, C., Barchiesi, L., Cox, I., Gaspari, M., Zhao, X., Ajello, M., Esposito, F.
Most of the super-massive black holes in the Universe accrete material in an obscured phase. While it is commonly accepted that the "dusty torus" is responsible for the nuclear obscuration, its geometrical, physical, and chemical properties are far f
Externí odkaz:
http://arxiv.org/abs/2410.02878
Autor:
Zhao, Xiurui, Marchesi, Stefano, Ajello, Marco, Civano, Francesca, Gilli, Roberto, Lanzuisi, Giorgio, López, Iván E., Silver, Ross, Torres-Albà, Nuria, Boorman, Peter G., Pizzetti, Andrealuna
We present a comprehensive X-ray analysis and spectral energy distribution (SED) fitting of WISEA J171419.96+602724.6, an extremely luminous type 2 quasar at $z$ = 2.99. The source was suggested as a candidate Compton-thick (column density N$_{\rm H}
Externí odkaz:
http://arxiv.org/abs/2409.01960
Autor:
Pizzetti, A., Torres-Alba, N., Marchesi, S., Buchner, J., Cox, I., Zhao, X., Neal, S., Sengupta, D., Silver, R., Ajello, M.
We present the multi-epoch analysis of 13 variable, nearby (z<0.1), Compton-thin (22
Externí odkaz:
http://arxiv.org/abs/2403.06919
Autor:
Boorman, P. G., Torres-Albà, N., Annuar, A., Marchesi, S., Pfeifle, R., Stern, D., Civano, F., Baloković, M., Buchner, J., Ricci, C., Alexander, D. M., Brandt, W. N., Brightman, M., Chen, C. T., Creech, S., Gandhi, P., García, J. A., Harrison, F., Hickox, R., Kammoun, E., LaMassa, S., Lanzuisi, G., Marcotulli, L., Madsen, K., Matt, G., Matzeu, G., Nardini, E., Piotrowska, J. M., Pizzetti, A., Puccetti, S., Sicilian, D., Silver, R., Walton, D. J., Wilkins, D. R., Zhao, X.
Ever since the discovery of the first Active Galactic Nuclei (AGN), substantial observational and theoretical effort has been invested into understanding how massive black holes have evolved across cosmic time. Circum-nuclear obscuration is now estab
Externí odkaz:
http://arxiv.org/abs/2311.04949
Autor:
Civano, Francesca, Zhao, Xiurui, Boorman, Peter, Marchesi, Stefano, Ananna, Tonima, Creech, Samantha, Chen, Chien-Ting, Hickox, Ryan, Stern, Daniel, Madsen, Kristin, García, Javier A., Silver, Ross, Aird, James, Alexander, David M., Balokovíc, Mislav, Brandt, William N., Buchner, Johannes, Gandhi, Poshak, Kammoun, Elias, LaMassa, Stephanie, Lanzuisi, Giorgio, Merloni, Andrea, Moretti, Alberto, Nandra, Kirpal, Nardini, Emanuele, Pizzetti, Anrealuna, Puccetti, Simonetta, Pfeifle, Ryan, Ricci, Claudio, Spiga, Daniele, Torres-Albá, Nuria, Collaboration, the HEX-P
Since the discovery of the cosmic X-ray background (CXB), astronomers have strived to understand the accreting supermassive black holes (SMBHs) contributing to its peak in the 10-40 keV band. Existing soft X-ray telescopes could study this population
Externí odkaz:
http://arxiv.org/abs/2311.04832
Autor:
Piotrowska, J. M., García, J. A., Walton, D. J., Beckmann, R. S., Stern, D., Ballantyne, D. R., Wilkins, D. R., Bianchi, S., Boorman, P. G., Buchner, J., Chen, C. -T., Coppi, P., Dauser, T., Fabian, A. C., Kammoun, E., Madsen, K., Mallick, L., Matt, G., Matzeu, G., Nardini, E., Pizzetti, A., Puccetti, S., Ricci, C., Tombesi, F., Torres-Albà, N., Wong, K. -W., Collaboration, the HEX-P
Constraining the primary growth channel of supermassive black holes (SMBH) remains one the most actively debated questions in the context of cosmological structure formation. Owing to the expected connection between SMBH spin parameter evolution and
Externí odkaz:
http://arxiv.org/abs/2311.04752
Autor:
Sengupta, Dhrubojyoti, Marchesi, Stefano, Vignali, Cristian, Torres-Albà, Núria, Bertola, Elena, Pizzetti, Andrealuna, Lanzuisi, Giorgio, Salvestrini, Francesco, Zhao, Xiurui, Gaspari, Massimo, Gilli, Roberto, Comastri, Andrea, Traina, Alberto, Tombesi, Francesco, Silver, Ross, Pozzi, Francesca, Ajello, Marco
Publikováno v:
A&A 676, A103 (2023)
We present the broad-band X-ray spectral analysis (0.6-50 keV) of seven Compton-Thick active galactic nuclei (CT-AGN; line-of-sight, l.o.s., column density $>10^{24}$ cm$^{-2}$) candidates selected from the Swift-BAT 100-month catalog, using archival
Externí odkaz:
http://arxiv.org/abs/2305.07705
Autor:
Silver, Ross, Torres-Alba, Núria, Zhao, Xiurui, Marchesi, Stefano, Pizzetti, Andrealuna, Cox, Isaiah, Ajello, Marco
Publikováno v:
A&A 675, A65 (2023)
We present a new method to predict the line-of-sight column density (NH) values of active galactic nuclei (AGN) based on mid-infrared (MIR), soft, and hard X-ray data. We developed a multiple linear regression machine learning algorithm trained with
Externí odkaz:
http://arxiv.org/abs/2301.09598
Autor:
Cox, Isaiah, Torres-Alba, Nuria, Marchesi, Stefano, Zhao, Xiurui, Ajello, Marco, Pizzetti, Andrealuna, Silver, Ross
The unified model of active galactic nuclei (AGN) includes a toroidal obscuring structure to explain the differences between Type I and Type II AGN as an effect of inclination angle. This toroidal structure is thought to be 'clumpy' as the line-of-si
Externí odkaz:
http://arxiv.org/abs/2301.07142
Publikováno v:
A&A 678, A154 (2023)
We present the analysis of multiepoch observations of a set of 12 variable, Compton-thin, local (z<0.1) active galactic nuclei (AGN) selected from the 100-month BAT catalog. We analyze all available X-ray data from \chandra, \xmm, and \nustar, adding
Externí odkaz:
http://arxiv.org/abs/2301.07138