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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 3 CONTRIBUTI IN ATTI DI CONVEGNO (Proceedings)
  4. 3.01 Contributi in Atti di convegno
Please use this identifier to cite or link to this item: 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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