The high energy X-ray probe (HEX-P): studying extreme accretion with ultraluminous X-ray sources

Autor: Matteo Bachetti, Matthew J. Middleton, Ciro Pinto, Andrés Gúrpide, Dominic J. Walton, Murray Brightman, Bret Lehmer, Timothy P. Roberts, Georgios Vasilopoulos, Jason Alford, Roberta Amato, Elena Ambrosi, Lixin Dai, Hannah P. Earnshaw, Hamza El Byad, Javier A. García, Gian Luca Israel, Amruta Jaodand, Kristin Madsen, Chandreyee Maitra, Shifra Mandel, Kaya Mori, Fabio Pintore, Ken Ohsuga, Maura Pilia, Daniel Stern, George Younes, Anna Wolter

Publikováno v: Frontiers in Astronomy and Space Sciences, Vol 10 (2023)

Introduction: Ultraluminous X-ray sources (ULXs) represent an extreme class of accreting compact objects: from the identification of some of the accretors as neutron stars to the detection of powerful winds travelling at 0.1–0.2 c, the increasing e

Externí odkaz: https://doaj.org/article/8a30718b913d4e20b3ce8ab2b4efeaa2

Spectral Calculations of 3D Radiation Magnetohydrodynamic Simulations of Super-Eddington Accretion onto a Stellar-mass Black Hole

Autor: Brianna S. Mills, Shane W. Davis, Yan-Fei Jiang, Matthew J. Middleton

Publikováno v: The Astrophysical Journal, Vol 974, Iss 2, p 166 (2024)

We use the Athena++ Monte Carlo (MC) radiation transfer module to postprocess simulation snapshots from nonrelativistic Athena++ radiation magnetohydrodynamic (RMHD) simulations. These simulations were run using a gray (frequency-integrated) approach

Externí odkaz: https://doaj.org/article/0f59a5202074426b8197debadddf3c1f

Global 3D Radiation Magnetohydrodynamic Simulations of Accretion onto a Stellar-mass Black Hole at Sub- and Near-critical Accretion Rates

Autor: Jiahui Huang, Yan-Fei Jiang, Hua Feng, Shane W. Davis, James M. Stone, Matthew J. Middleton

Publikováno v: The Astrophysical Journal, Vol 945, Iss 1, p 57 (2023)

We present global 3D radiation magnetohydrodynamic simulations of accretion onto a 6.62 solar-mass black hole, with quasi-steady-state accretion rates reaching 0.016–0.9 times the critical accretion rate, which is defined as the accretion rate for

Externí odkaz: https://doaj.org/article/3718d9ad03af452fb19a65d3907366ef

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

The variability behavior of NGC 925 ULX-3

Autor: Hannah P. Earnshaw, Murray Brightman, Fiona A. Harrison, Marianne Heida, Amruta Jaodand, Matthew J. Middleton, Timothy P. Roberts, Dominic J. Walton

Publikováno v: The Astrophysical Journal, 2022, Vol.934(1), pp.42 [Peer Reviewed Journal]

We report the results of a 2019-2021 monitoring campaign with Swift and associated target-of-opportunity observations with XMM-Newton and NuSTAR, examining the spectral and timing behavior of the highly variable ultraluminous X-ray source (ULX) NGC 9

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::023fe39eda7f67a5326df45a31f0d713
https://eprints.soton.ac.uk/475453/