Browsing by Author "Bianchi, S."
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- ItemBroad-band X-ray spectral analysis of the Seyfert 1 galaxy GRS 1734-292(2017) Tortosa, A.; Marinucci, A.; Matt, G.; Bianchi, S.; La Franca, F.; Ballantyne, D. R.; Boorman, P. G.; Fabian, A. C.; Farrah, D.; Ricci, Claudio; Fuerst, F.; Gandhi, P.; Harrison, F. A.; Koss, M. J.; Stern, D.; Ursini, F.; Walton, D. J.
- ItemNuSTAR catches the unveiling nucleus of NGC 1068(2016) Bauer, Franz Erik; Ricci, Claudio; Marinucci, A.; Bianchi, S.; Matt, G.; Alexander, D.; Balokovic, M.; Brandt, W.; Gandhi, P.; Guainazzi, M.; Harrison, F.; Iwasawa, K.; Koss, M.; Madsen, K.; Nicastro, F.; Puccetti, S.; Stern, D.; Walton, D.
- ItemProbing the circumnuclear absorbing medium of the buried AGN in NGC 1068 through NuSTAR observations(OUP, 2019) Zaino, A.; Bianchi, S.; Marinucci, A.; Matt, G.; Bauer, Franz Erik; Brandt, W. N.; Gandhi, P.; Guainazzi, M.; Iwasawa, K.; Puccetti, S.; Ricci, Claudio; Walton, D. J.We present the results of the latest NuSTAR monitoring campaign of the Compton-thick Seyfert 2 galaxy NGC 1068, composed of four ∼50 ks observations performed between 2017 July and 2018 February to search for flux and spectral variability on time-scales from 1 to 6 months. We detect one unveiling and one eclipsing event with time-scales less than 27 and 91 d, respectively, ascribed to Compton-thick material with N H = (1.8 ± 0.8) × 10 24 and ≥ (2.4 ± 0.5) × 10 24 cm −2 moving across our line of sight. This gas is likely located in the innermost part of the torus or even further inward, thus providing further evidence of the clumpy structure of the circumnuclear matter in this source. Taking advantage of simultaneous Swift–XRT observations, we also detected a new flaring ULX, at a distance d ∼ 30 arcsec (i.e. ∼2 kpc) from the nuclear region of NGC 1068, with a peak X-ray intrinsic luminosity of (3.0 ± 0.4) × 10 40 erg s −1 in the 2–10 keV band.
- ItemThe nature of the torus in the heavily obscured AGN Markarian 3 : an X-ray study(2016) Guainazzi, M.; Risaliti, G.; Awaki, H.; Arévalo, P.; Bauer, Franz Erik; Bianchi, S.; Boggs, S.E.; Brandt, W.N.; Brightman, M.; Christensen, F.E.
- ItemThe NuSTAR X-ray spectrum of the low-luminosity active galactic nucleus in NGC 7213(2015) Ursini, F.; Marinucci, A.; Matt, G.; Bianchi, S.; Tortosa, A.; Stern, D.; Arévalo, P.; Ballantyne, D.; Bauer, Franz Erik; Fabian, A.; Harrison, F.; Lohfink, A.; Reynolds, C.; Walton, D.
- ItemThe Seyfert 2 galaxy NGC 2110 : hard X-ray emission observed by NuSTAR and variability of the iron Kα line(2015) Marinucci, A.; Matt, G.; Bianchi, S.; Lu, T. N.; Arévalo, P.; Balokovic, M.; Ballantyne, D.; Bauer, Franz Erik; Boggs, S. E.; Christensen, F. E.; Craig, W. W.; Gandhi, P.; Hailey, C. J.; Harrison, F.; Puccetti, S.; Rivers, E.; Walton, D. J.; Stern, D.; Zhang, W.
- ItemThe weak Fe fluorescence line and long-term X-ray evolution of the Compton-thick active galactic nucleus in NGC7674(2017) Gandhi, P.; Annuar, A.; Lansbury, G. B.; Stern, D.; Alexander, D. M.; Bauer, Franz Erik; Bianchi, S.; Boggs, S. E.; Boorman, P. G.; Ricci, Claudio
- ItemUniversal bolometric corrections for active galactic nuclei over seven luminosity decades(2020) Duras, F.; Bongiorno, A.; Ricci, F.; Piconcelli, E.; Shankar, F.; Lusso, E.; Bianchi, S.; Fiore, F.; Maiolino, R.; Marconi, A.; Onori, F.; Sani, E.; Schneider, R.; Vignali, C.; La Franca, F.Context. The AGN bolometric correction is a key element for understanding black hole (BH) demographics and computing accurate BH accretion histories from AGN luminosities. However, current estimates still differ from each other by up to a factor of two to three, and rely on extrapolations at the lowest and highest luminosities.