Výsledky vyhledávání

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

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The Chameleon on the branches: spectral state transition and dips in NGC 247 ULX-1

Autor: Fabio Pintore, M. Del Santo, A. Robba, P. Kosec, E. Ambrosi, Erin Kara, Antonino D'Ai, Dom Walton, Ciro Pinto, A. C. Fabian, G. Rodriguez-Castillo, Matthew J. Middleton, F. Fürst, Timothy P.L. Roberts, Didier Barret, Roberto Soria, W. N. Alston

Publikováno v: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 2021, 507 (4), pp.5567-5579. ⟨10.1093/mnras/stab2427⟩
Mon.Not.Roy.Astron.Soc.
Mon.Not.Roy.Astron.Soc., 2021, 507 (4), pp.5567-5579. ⟨10.1093/mnras/stab2427⟩
Monthly Notices of the Royal Astronomical Society, 2021, Vol.507(4), pp.5567-5579 [Peer Reviewed Journal]

Soft Ultra-Luminous X-ray (ULXs) sources are a subclass of the ULXs that can switch from a supersoft spectral state, where most of the luminosity is emitted below 1 keV, to a soft spectral state with significant emission above 1 keV. In a few systems

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a8334bb51e689aea2e95896630c6f4a
https://doi.org/10.1093/mnras/stab2427

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Extreme relativistic reflection in the active galaxy ESO 033-G002

Autor: Mark Reynolds, Thomas Dauser, Dominic J. Walton, W. N. Alston, P. Kosec, Claudio Ricci, Daniel Stern, Fiona A. Harrison, A. C. Fabian, Javier A. García, Luigi C. Gallo, Emanuele Nardini, Christopher S. Reynolds, Mislav Baloković, M. Koss, Jonah Miller

Publikováno v: Monthly Notices of the Royal Astronomical Society

We present the first high signal-to-noise broadband X-ray spectrum of the radio-quiet type-2 Seyfert ESO 033-G002, combining data from $XMM$-$Newton$ and $NuSTAR$. The nuclear X-ray spectrum is complex, showing evidence for both neutral and ionised a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::581d2a4f6732ef4567404f3cd8dc24e5
https://doi.org/10.1093/mnras/stab1290

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Modelling X-ray RMS spectra II: the ultrafast outflow of PDS 456

Autor: A. M. Joyce, Michael Parker, J. N. Reeves, Z. Igo, W. N. Alston, L. Härer, G. A. Matzeu, Andrew Lobban, Felix Fürst

Publikováno v: Monthly Notices of the Royal Astronomical Society. 500:4506-4513

We present an improved model for excess variance spectra describing ultrafast outflows and successfully apply it to the luminous ($L_{\rm bol}\sim 10^{47}\mathrm{erg}\, \mathrm{s}^{-1}$) low-redshift (z = 0.184) quasar Pico del Dias Survey (PDS) 456.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7a1faf19ae448c8c99bad1344494b6c6
https://doi.org/10.1093/mnras/staa3559

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Ejection-accretion connection in NLS1 AGN 1H 1934-063

Autor: Y Xu, C Pinto, E Kara, M Masterson, J A García, A C Fabian, M L Parker, D Barret, W N Alston, G Cusumano

Publikováno v: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 2022, 513 (2), pp.1910-1924. ⟨10.1093/mnras/stac1058⟩

Accretion and ejection of matter in active galactic nuclei (AGN) are tightly connected phenomena and represent fundamental mechanisms regulating the growth of the central supermassive black hole and the evolution of the host galaxy. However, the exac

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9a044f918a56dddbbb19f065ab5a3a3a

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Modeling the Multiwavelength Variability of Mrk 335 Using Gaussian Processes

Autor: S. Komossa, Luigi C. Gallo, Dan R. Wilkins, Alpha A. Lee, George Cann, W. N. Alston, Erin Kara, D. J. K. Buisson, Anthony Bourached, Ryan-Rhys Griffiths, Dirk Grupe, Adam Ingram, Michael Parker, Andrew J. Young, Jiachen Jiang

The optical and UV variability of the majority of AGN may be related to the reprocessing of rapidly-changing X-ray emission from a more compact region near the central black hole. Such a reprocessing model would be characterised by lags between X-ray

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9443273e8885581418010b2f89b725e9

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Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1

Autor: A. C. Fabian, Timothy P.L. Roberts, R. Sathyaprakash, A. Robba, P. Kosec, Matthew J. Middleton, Hannah P. Earnshaw, Ciro Pinto, Erin Kara, Fabio Pintore, Felix Fuerst, Dom Walton, W. N. Alston, Antonino D'Ai, M. Del Santo, Didier Barret, E. Ambrosi, Michael Parker

Publikováno v: Mon.Not.Roy.Astron.Soc.
Mon.Not.Roy.Astron.Soc., 2021, 505 (3), pp.3722-3729. ⟨10.1093/mnras/stab1473⟩
Monthly Notices of the Royal Astronomical Society, 2021, Vol.505(3), pp.3722-3729 [Peer Reviewed Journal]
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 2021, 505 (3), pp.3722-3729. ⟨10.1093/mnras/stab1473⟩

Most ultraluminous X-ray sources (ULXs) are believed to be stellar mass black holes or neutron stars accreting beyond the Eddington limit. Determining the nature of the compact object and the accretion mode from broadband spectroscopy is currently a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::61c8587407bfc05fd1a03c6a2e7e1332
https://hal.archives-ouvertes.fr/hal-03217510

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Relativistic spectroscopy of the extreme NLS1 IRAS 13224-3809

Autor: W. N. Alston, Anne M. Lohfink, Jiachen Jiang, Douglas J. K. Buisson, Michael Parker, Andrew C. Fabian, Ciro Pinto, Erin Kara

Publikováno v: Proceedings of Revisiting narrow-line Seyfert 1 galaxies and their place in the Universe — PoS(NLS1-2018).

The narrow line Seyfert 1 (NLS1) IRAS 13224-3809 is the most X-ray variable active galactic nucleus (AGN), exhibiting 0.3-10 keV flux changes of over an order of magnitude within an hour. We report on the results of the 1.5 Ms 2016 XMM-Newton/NuSTAR

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::af9fdb9f59d85e488940352310f9c81e
https://doi.org/10.22323/1.328.0031

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