Výsledky vyhledávání - "Nick Higginbottom"

Optical line spectra of tidal disruption events from reprocessing in optically thick outflows

Autor: Edward J Parkinson, Christian Knigge, James H Matthews, Knox S Long, Nick Higginbottom, Stuart A Sim, Samuel W Mangham

Publikováno v: Parkinson, E J, Knigge, C, Matthews, J H, Long, K S, Higginbottom, N, Sim, S A & Mangham, S W 2022, ' Optical line spectra of tidal disruption events from reprocessing in optically thick outflows ', Monthly Notices of the Royal Astronomical Society, vol. 510, no. 4, pp. 5426–5443 . https://doi.org/10.1093/mnras/stac027

A significant number of tidal disruption events (TDEs) radiate primarily at optical and ultraviolet (UV) wavelengths, with only weak soft X-ray components. One model for this optical excess proposes that thermal X-ray emission from a compact accretio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c4929ff469f2c68d34e0a53d63731bb3

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Thermally driven winds in ultraluminous X-ray sources

Autor: Matthew J. Middleton, Christian Knigge, Nick Higginbottom, Grzegorz Wiktorowicz, Norman Khan

The presence of radiatively driven outflows is well established in ultraluminous X-ray sources (ULXs). These outflows are optically thick and can reprocess a significant fraction of the accretion luminosity. Assuming isotropic emission, escaping radi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8963ab96dbad2ea00a0a8efc3c999861
https://eprints.soton.ac.uk/454551/

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Do reverberation mapping analyses provide an accurate picture of the broad-line region?

Autor: Keith Horne, Stuart A. Sim, James Matthews, Nick Higginbottom, S. W. Mangham, Peter K. G. Williams, Knox S. Long, Christian Knigge, A. Pancoast

Publikováno v: Monthly Notices of the Royal Astronomical Society. 488:2780-2799

Reverberation mapping (RM) is a powerful approach for determining the nature of the broad-line region (BLR) in active galactic nuclei. However, inferring physical BLR properties from an observed spectroscopic time series is a difficult inverse proble

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0162e8c559324b44789838850e002f82
https://doi.org/10.1093/mnras/stz1713

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Accretion disc winds in tidal disruption events: ultraviolet spectral lines as orientation indicators

Autor: S. A. Sim, Christian Knigge, James Matthews, Henrietta A. Hewitt, Nick Higginbottom, Edward J. Parkinson, Knox S. Long

Publikováno v: Parkinson, E J, Knigge, C, Long, K S, Matthews, J H, Higginbottom, N, Sim, S A & Hewitt, H A 2020, ' Accretion Disc Winds in Tidal Disruption Events: Ultraviolet Spectral Lines as Orientation Indicators ', Monthly Notices of the Royal Astronomical Society, Advance Access . https://doi.org/10.1093/mnras/staa1060

Some tidal disruption events (TDEs) exhibit blueshifted broad absorption lines (BALs) in their rest-frame ultraviolet (UV) spectra, while others display broad emission lines (BELs). Similar phenomenology is observed in quasars and accreting white dwa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::51a5e2130c9d64e79c0500a5c7f3f85c
https://eprints.soton.ac.uk/439681/

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Thermal and radiation driving can produce observable disc winds in hard-state X-ray binaries

Autor: Henrietta A. Hewitt, Edward J. Parkinson, Stuart A. Sim, James Matthews, Christian Knigge, Nick Higginbottom, Knox S. Long, S. W. Mangham

Publikováno v: Higginbottom, N, Knigge, C, Sim, S A, Long, K S, Matthews, J H, Hewitt, H A, Parkinson, E J & Mangham, S W 2020, ' Thermal and radiation driving can produce observable disc winds in hard-state X-ray binaries ', Monthly Notices of the Royal Astronomical Society, vol. 492, no. 4, pp. 5271-5279 . https://doi.org/10.1093/mnras/staa209

X-ray signatures of outflowing gas have been detected in several accreting black-hole binaries, always in the soft state. A key question raised by these observations is whether these winds might also exist in the hard state. Here, we carry out the fi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c0917c51d46ddcebb9b1ee3e321b683
https://eprints.soton.ac.uk/437918/

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Stratified disc wind models for the AGN broad-line region: ultraviolet, optical and X-ray properties

Autor: Christian Knigge, James Matthews, Knox S. Long, Nick Higginbottom, Stuart A. Sim, Henrietta A. Hewitt, Edward J. Parkinson, S. W. Mangham

Publikováno v: Matthews, J H, Knigge, C, Higginbottom, N, Long, K S, Sim, S A, Mangham, S W, Parkinson, E J & Hewitt, H A 2020, ' Stratified disc wind models for the AGN broad-line region: ultraviolet, optical and X-ray properties ', Monthly Notices of the Royal Astronomical Society, vol. 492, no. 4, pp. 5540-5560 . https://doi.org/10.1093/mnras/staa136

The origin, geometry and kinematics of the broad line region (BLR) gas in quasars and active galactic nuclei (AGN) are uncertain. We demonstrate that clumpy biconical disc winds illuminated by an AGN continuum can produce BLR-like spectra. We first u

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Testing quasar unification: radiative transfer in clumpy winds

Autor: Nick Higginbottom, James Matthews, S. W. Mangham, Christian Knigge, Knox S. Long, Stuart A. Sim

Publikováno v: Matthews, J H, Knigge, C, Long, K S, Sim, S A, Higginbottom, N & Mangham, S W 2016, ' Testing quasar unification: radiative transfer in clumpy winds ', Monthly Notices of the Royal Astronomical Society, vol. 458, no. 1, pp. 293-305 . https://doi.org/10.1093/mnras/stw323

Various unification schemes interpret the complex phenomenology of quasars and luminous active galactic nuclei (AGN) in terms of a simple picture involving a central black hole, an accretion disc and an associated outflow. Here, we continue our tests

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b5ab3c6bb2946d25b7008b942662bcab
https://ora.ox.ac.uk/objects/uuid:3064959e-728f-4aaa-aafe-6d726e6d4cfe

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The luminosity dependence of thermally-driven disc winds in low-mass X-ray binaries

Autor: Knox S. Long, James Matthews, Christian Knigge, Nick Higginbottom, Edward J. Parkinson

We have carried out radiation-hydrodynamic simulations of thermally-driven accretion disc winds in low-mass X-ray binaries. Our main goal is to study the luminosity dependence of these outflows and compare with observations. The simulations span the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::301c2d5932eadea1649527986a5be7b2
https://eprints.soton.ac.uk/428283/

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The reverberation signatures of rotating disc winds in active galactic nuclei

Autor: Nick Higginbottom, James Matthews, S. W. Mangham, Christian Knigge, Stuart A. Sim, Knox S. Long

Publikováno v: Mangham, S W, Knigge, C, Matthews, J H, Long, K S, Sim, S A & Higginbottom, N 2017, ' The reverberation signatures of rotating disc winds in active galactic nuclei ' Monthly Notices of the Royal Astronomical Society, vol. 471, no. 4, pp. 4788-4801 . DOI: 10.1093/mnras/stx1863

The broad emission lines (BELs) in active galactic nuclei (AGN) respond to ionizing continuum variations. The time and velocity dependence of their response depends on the structure of the broad-line region: its geometry, kinematics and ionization st

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::af98b5c74c85eb5b4fb159fb52d138a2
https://doi.org/10.1093/mnras/stx1863

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