Browsing by Author "Elvis, M."
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- ItemInferring Compton-thick AGN candidates at z > 2 with Chandra using the > 8 keV rest-frame spectral curvature.(2017) Baronchelli, Linda; Ricci, Claudio; Treister, Ezequiel; Koss, M.; Schawinski, K.; Cardamone, C.; Civano, F.; Comastri, A.; Elvis, M.; Lanzuisi, G.; Marchesi, S.
- ItemNustar and suzaku X-Ray spectroscopy of NGC 4151: evidence for reflection from the inner accretion disk(2015) Keck, M.; Brenneman, L.; Ballantyne, D.; Bauer, Franz Erik; Boggs, S.; Christensen, F.; Craig, W.; Dauser, T.; Elvis, M.; Fabian, A.; Fuerst, F.; García, J.; Grefenstette, B.; Hailey, C.; Harrison, F.; Madejski, G.; Marinucci, A.; Matt, G.; Reynolds, C.; Stern, D.; Walton, D.; Zoghbi, A.
- ItemSimultaneous NuSTAR and XMM-Newton 0.5-80 keV spectroscopy of the narrow-line Seyfert 1 galaxy SWIFT J2127.4+5654(2014) Marinucci, A.; Matt, G.; Kara, E.; Miniutti, G.; Elvis, M.; Arévalo, P.; Ballantyne, D. R.; Baloković, M.; Bauer, Franz Erik; Brenneman, L.
- ItemThe soft-X-ray emission of Ark 120. XMM-Newton, NuSTAR, and the importance of taking the broad view(OXFORD UNIV PRESS, 2014) Matt, G.; Marinucci, A.; Guainazzi, M.; Brenneman, L. W.; Elvis, M.; Lohfink, A.; Arevalo, P.; Boggs, S. E.; Cappi, M.; Christensen, F. E.; Craig, W. W.; Fabian, A. C.; Fuerst, F.; Hailey, C. J.; Harrison, F. A.; Parker, M.; Reynolds, C. S.; Stern, D.; Walton, D. J.; Zhang, W. W.We present simultaneous XMM-Newton and NuSTAR observations of the 'bare' Seyfert 1 galaxy, Ark 120, a system in which ionized absorption is absent. The NuSTAR hard-X-ray spectral coverage allows us to constrain different models for the excess soft-X-ray emission. Among phenomenological models, a cutoff power law best explains the soft-X-ray emission. This model likely corresponds to Comptonization of the accretion disc seed UV photons by a population of warm electrons: using Comptonization models, a temperature of similar to 0.3 keV and an optical depth of similar to 13 are found. If the UV-to-X-ray optxagnf model is applied, the UV fluxes from the XMM-Newton Optical Monitor suggest an intermediate black hole spin. Contrary to several other sources observed by NuSTAR, no high-energy cutoff is detected with a lower limit of 190 keV.