High-density disc reflection spectroscopy of low-mass active galactic nuclei

Autor: L Mallick, A C Fabian, J A García, J A Tomsick, M L Parker, T Dauser, D R Wilkins, B De Marco, J F Steiner, R M T Connors, G Mastroserio, A G Markowitz, C Pinto, W N Alston, A M Lohfink, P Gandhi

Publikováno v: Monthly Notices of the Royal Astronomical Society. 513:4361-4379

The standard alpha-disc model predicts an anti-correlation between the density of the inner accretion disc and the black hole mass times square of the accretion rate, as seen in higher mass ($M_{\rm BH}>10^{6} M_{\odot}$) active galactic nuclei (AGNs

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f81b82f5cb6d7bec277778b37b5fbbf0
https://doi.org/10.1093/mnras/stac990

Intensive disc-reverberation mapping of Fairall 9

Autor: S. Valenti, A. A. Breeveld, W. N. Brandt, J. M. Gelbord, D. A. Starkey, M. H. Siegel, Marianne Vestergaard, K. L. Page, Bradley M. Peterson, Dirk Grupe, Christopher A. Onken, Kirk T. Korista, S. J. Laporte, E. Dalla Bontà, D. Mudd, Smita Mathur, Phil Uttley, Aaron J. Barth, Michael D. Joner, P. A. Evans, Gerard A. Kriss, Hagai Netzer, D. Gonzalez-Buitrago, J. V. Hernández Santisteban, M. R. Goad, Gary J. Ferland, T. Schmidt, Susanna Bisogni, Anne M. Lohfink, Keith Horne, Rick Edelson, Edward M. Cackett, S. B. Cenko, Simon Vaughan, Missagh Mehdipour, F. E. Marshall

Publikováno v: Monthly Notices of the Royal Astronomical Society, 498(4), 5399-5416. Oxford University Press
Santisteban, J V H, Edelson, R, Horne, K, Gelbord, J M, Barth, A J, Cackett, E M, Goad, M R, Netzer, H, Starkey, D, Uttley, P, Brandt, W N, Korista, K, Lohfink, A M, Onken, C A, Page, K L, Siegel, M, Vestergaard, M, Bisogni, S, Breeveld, A A, Cenko, S B, Dalla Bonta, E, Evans, P A, Ferland, G, Gonzalez-Buitrago, D H, Grupe, D, Joner, M D, Kriss, G, LaPorte, S J, Mathur, S, Marshall, F, Mehdipour, M, Mudd, D, Peterson, B M, Schmidt, T, Vaughan, S & Valenti, S 2020, ' Intensive disc-reverberation mapping of Fairall 9 : first year of Swift and LCO monitoring ', Monthly Notices of the Royal Astronomical Society, vol. 498, no. 4, pp. 5399-5416 . https://doi.org/10.1093/mnras/staa2365

We present results of time-series analysis of the first year of the Fairall 9 intensive disc-reverberation campaign. We used Swift and the Las Cumbres Observatory global telescope network to continuously monitor Fairall 9 from X-rays to near-infrared

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fa9082dc92e1900849c479db25e1c378
https://hdl.handle.net/11245.1/42757266-9dfb-48b2-b7ba-0e366e21aa8a

The remarkable X-ray variability of IRAS 13224-3809

Autor: Christopher S. Reynolds, Matthew J. Middleton, A. C. Fabian, Edward M. Cackett, Dan R. Wilkins, Erin Kara, G. Miniutti, Andrew J. Young, Dom Walton, Ciro Pinto, D. J. K. Buisson, Jiachen Jiang, B. De Marco, Michal Dovciak, Anne M. Lohfink, William Alston, Phil Uttley, Michael Parker, Luigi C. Gallo, Abderahmen Zogbhi

Publikováno v: Alston, W N, Fabian, A C, Buisson, D J K, Kara, E, Parker, M L, Lohfink, A M, Uttley, P, Wilkins, D R, Pinto, C, De Marco, B, Cackett, E M, Middleton, M J, Walton, D J, Reynolds, C S, Jiang, J, Gallo, L C, Zogbhi, A, Miniutti, G, Dovciak, M & Young, A J 2019, ' The remarkable X-ray variability of IRAS 13224-3809-I. The variability process ', Monthly Notices of the Royal Astronomical Society, vol. 482, no. 2, pp. 2088-2106 . https://doi.org/10.1093/mnras/sty2527
NASA Astrophysics Data System
ResearcherID
Monthly Notices of the Royal Astronomical Society, 482(2), 2088-2106. Oxford University Press

We present a detailed X-ray timing analysis of the highly variable NLS1 galaxy, IRAS 13224-3809. The source was recently monitored for 1.5 Ms with XMM-Newton which, combined with 500 ks archival data, makes this the best studied NLS1 galaxy in X-rays

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea0962c79b5f6051009814a4649ddd08
https://dare.uva.nl/personal/pure/en/publications/the-remarkable-xray-variability-of-iras-132243809(c3a7e053-53f4-43f2-8927-240b023cd0d4).html

The Inner Accretion Flow in the Resurgent Seyfert-1.2 AGN Mrk 817

Autor: Daniel Stern, Abderahmen Zoghbi, John C. Raymond, Anne M. Lohfink, Jon M. Miller, Ehud Behar, W. N. Brandt, D. Barret, P. Draghis, Mark Reynolds, Michael Koss, Laura Brenneman, E. Kammoun

Publikováno v: Astrophys.J.Lett.
Astrophys.J.Lett., 2021, 911 (1), pp.L12. ⟨10.3847/2041-8213/abef6f⟩

Accretion disks and coronae around massive black holes have been studied extensively, and they are known to be coupled. Over a period of 30 years, however, the X-ray (coronal) flux of Mrk 817 increased by a factor of 40 while its UV (disk) flux remai

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::50c98f5abfd8683956ef7d820975c8e7

A hard look at local, optically selected, obscured Seyfert galaxies

Autor: W. N. Brandt, Laura Brenneman, Jelle Kaastra, Abderahmen Zoghbi, Kyuseok Oh, Ehud Behar, Richard F. Mushotzky, Anne M. Lohfink, Michael Koss, E. S. Kammoun, Jonah Miller, Daniel Stern, Didier Barret, Daniel Proga

Publikováno v: Astrophys.J.
Astrophys.J., 2020, 901 (2), pp.161. ⟨10.3847/1538-4357/abb29f⟩

We study the X-ray spectra of a sample of 19 obscured, optically-selected Seyfert galaxies (Sy 1.8, 1.9 and 2) in the local universe ($d \leq 175$~Mpc), drawn from the CfA Seyfert sample. Our analysis is driven by the high sensitivity of NuSTAR in th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4024e6c7b8a5faff77cad1b0d2f1cb9a
https://ui.adsabs.harvard.edu/abs/2020ApJ...901..161K