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http://hdl.handle.net/20.500.12386/24139
Title: | Mining the XRT archive to probe the X-ray absorber structure in the AGN population | Authors: | BALLO, Lucia SEVERGNINI, Paola MORETTI, Alberto DELLA CECA, Roberto ANDREON, Stefano BRAITO, Valentina CACCIANIGA, Alessandro CAMPANA, Sergio VIGNALI, CRISTIAN |
Issue Date: | 2015 | Journal: | POS PROCEEDINGS OF SCIENCE | Volume: | Swift: 10 Years of Discovery (SWIFT 10) | Number: | 233 | First Page: | 122 | Abstract: | One of the key ingredients of the Unified Model of Active Galactic Nuclei (AGN) is the presence of a torus-like optically thick medium composed by dust and gas around the putative supermassive black hole. However, the structure, size and composition of this circumnuclear medium are still matter of debate. To this end, the search for column density variations through X-ray monitoring on different timescales (months, weeks and few days) is fundamental to constrain size, kinematics and location of the X-ray absorber(s). Here we describe our project of mining the Swift-XRT archive to assemble a sample of AGN with extreme column density variability and determining the physical properties of the X-ray absorber(s). We also present the results obtained from a daily-weekly Swift-XRT follow-up monitoring recently performed on one of the most interesting new candidates for variability discovered so far, Mrk 915. | Conference Name: | Swift: 10 Years of Discovery (SWIFT 10) | Conference Place: | Roma | Conference Date: | 2-5 December 2014 | URI: | http://hdl.handle.net/20.500.12386/24139 | URL: | https://pos.sissa.it/233/122 | ISSN: | 1824-8039 | DOI: | 10.22323/1.233.0122 | Bibcode ADS: | 2015arXiv150502593B | Fulltext: | open |
Appears in Collections: | 3.01 Contributi in Atti di convegno |
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SWIFT_10_122_ballo.pdf | PDF editoriale | 482.71 kB | Adobe PDF | View/Open |
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