TR
T. P. Roberts
astro-ph.HEastro-phastro-ph.COastro-ph.GAastro-ph.SRastro-ph.IMphysics.comp-phphysics.plasm-ph
On Valency
published · living versionsW_rx29bnyt·v1 · currentpublished
The Hunt for Pulsating Ultraluminous X-ray Sources
with X. Song, D. J. Walton, G. B. Lansbury, P. A. Evans +2
1 version
W_wq5g93vz·v1published
Preprints & journals
122 papers in the corpus · 1998–2026Ultraluminous X-ray sources in the first eROSITA survey I. Candidate catalogs2608.25620v1 · P. Weber, T. P. Roberts, S. Hammerich et al.2026 · 0 citationsAstronomy and Astrophysics, 712, A112 (2026)
A Broadband X-ray Analysis and Optical Counterpart Search of IC5052 ULX2608.24539v1 · Nabil Brice, Dominic J. Walton, Felix Furst et al.2026 · 0 citationsarXiv
Type I X-ray Burst Emission Reflected into the Eclipses of EXO 0748-6762501.16324v2 · Amy H. Knight, Jakob van den Eijnden, Adam Ingram et al.2025 · 3 citationsarXiv
The long-term variability of a population of ULXs monitored by Chandra2411.07459v1 · Hannah P. Earnshaw, Gauri Patti, Murray Brightman et al.2024 · 3 citationsarXiv
Simultaneous Optical and X-ray Detection of a Thermonuclear Burst in the 2024 Outburst of EXO 0748-6762411.03269v1 · Amy H. Knight, Lauren Rhodes, Douglas J. K. Buisson et al.2024 · 5 citationsarXiv
A New Broadband Spectral State in the Ultraluminous X-ray Source Holmberg IX X-12409.12241v2 · D. J. Walton, M. Bachetti, P. Kosec et al.2024 · 2 citationsarXiv
Exploring the case for hard-X-ray beaming in NGC 6946 X-12408.07751v1 · Tobias Beuchert, Matthew J. Middleton, Roberto Soria et al.2024 · 4 citationsarXiv
Skipping a beat: discovery of persistent quasi-periodic oscillations associated with pulsed fraction drop of the spin signal in M51 ULX-72407.09240v1 · Matteo Imbrogno, Sara Elisa Motta, Roberta Amato et al.2024 · 10 citationsarXiv
NGC 2403 XMM4: evidence for a super-Eddington neutron star with a possible transient pulsation2401.02177v1 · W. Luangtip (1, T. P. Roberts2024 · 3 citationsarXiv
On the nature of the ultraluminous X-ray source Holmberg II X-12311.16243v1 · F. Barra, C. Pinto, M. Middleton et al.2023 · 9 citationsarXiv
Digging a little deeper: characterising three new extreme ULX candidates2308.01034v1 · T. P. Roberts, D. J. Walton, A. D. A. Mackenzie et al.2023 · 4 citationsarXiv
The Large Deficit of HMXB Emission from Luminous Infrared Galaxies: the Case of the Circumnuclear Starburst Ring in NGC 75522305.19491v1 · Lacey West, Kristen Garofali, Bret D. Lehmer et al.2023 · 5 citationsarXiv
Probing the nature of the low state in the extreme ultraluminous X-ray pulsar NGC 5907 ULX12302.03425v1 · F. Fuerst, D. J. Walton, G. L. Israel et al.2023 · 25 citationsA&A 672, A140 (2023)
Unveiling the disc structure in ultraluminous X-ray source NGC 55 ULX-12207.12870v2 · F. Barra, C. Pinto, D. J. Walton et al.2022 · 12 citationsarXiv
A transient ultraluminous X-ray source in NGC 552207.09447v1 · A. Robba, C. Pinto, F. Pintore et al.2022 · 6 citationsarXiv
A multi-wavelength view of distinct accretion regimes in the pulsating ultraluminous X-ray source NGC 1313 X-22202.06986v1 · Rajath Sathyaprakash, Timothy P. Roberts, Fabien Grise et al.2022 · 12 citationsarXiv
The impact of precession on the observed population of ULXs2110.11318v1 · Norman Khan, Matthew. J. Middleton, Grzegorz Wiktorowicz et al.2021 · 8 citationsarXiv
A Multi-Mission Catalogue of Ultraluminous X-ray Source Candidates2110.07625v1 · D. J. Walton, A. D. A. Mackenzie, H. Gully et al.2021 · 79 citationsarXiv
The chameleon on the branches: spectral state transition and dips in NGC 247 ULX-12108.09221v1 · A. D'Ai, C. Pinto, M. Del Santo et al.2021 · 17 citationsarXiv
Broadband X-ray spectral variability of the pulsing ULX NGC 1313 X-22106.04501v2 · A. Robba, C. Pinto, D. J. Walton et al.2021 · 18 citationsA&A 652, A118 (2021)
Long-term pulse period evolution of the ultra-luminous X-ray pulsar NGC 7793 P132105.04229v1 · F. Fuerst, D. J. Walton, M. Heida et al.2021 · 29 citationsA&A 651, A75 (2021)
Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-12104.11163v2 · W. N. Alston, C. Pinto, D. Barret et al.2021 · 22 citationsarXiv
XMM-Newton campaign on the ultraluminous X-ray source NGC 247 ULX-1: outflows2104.11164v2 · C. Pinto, R. Soria, D. Walton et al.2021 · 68 citationsarXiv
A New Transient Ultraluminous X-ray Source in NGC 70902011.08870v2 · D. J. Walton, M. Heida, M. Bachetti et al.2020 · 16 citationsarXiv
NIR Counterparts to ULXs (III): Completing the photometric survey and selected spectroscopic results2006.02795v1 · K. M. L'opez, M. Heida, P. G. Jonker et al.2020 · 25 citationsarXiv
The Ultraluminous X-ray sources population of the galaxy NGC 74562001.08752v2 · F. Pintore, M. Marelli, R. Salvaterra et al.2020 · 19 citationsarXiv
The (re)appearance of NGC 925 ULX-3, a new transient ULX2001.00642v2 · Hannah P. Earnshaw, Marianne Heida, Murray Brightman et al.2020 · 20 citationsarXiv
XMM-Newton Campaign On Ultraluminous X-ray Source NGC 1313 X-1: Wind vs. State Variability1911.09568v2 · C. Pinto, D. J. Walton, E. Kara et al.2019 · 52 citationsarXiv
Discovery of a soft X-ray lag in the Ultraluminous X-ray Source NGC 1313 X-11911.09582v1 · E. Kara, C. Pinto, D.J. Walton et al.2019 · 24 citationsarXiv
The Unusual Broadband X-ray Spectral Variability of NGC 1313 X-1 seen with XMMNewton, Chandra and NuSTAR1911.09622v2 · D. J. Walton, C. Pinto, M. Nowak et al.2019 · 52 citationsarXiv
The Hunt for Pulsating Ultraluminous X-ray Sources1910.11857v1 · X. Song, D. J. Walton, G. B. Lansbury et al.2019 · 34 citationsarXivon Valency
Discovery and analysis of a ULX nebula in NGC 35211907.12814v1 · K. M. L'opez, P. G. Jonker, M. Heida et al.2019 · 10 citationsarXiv
Observational limits on the X-ray emission from the bubble nebula surrounding Ho IX X-11907.06439v1 · Rajath Sathyaprakash, Timothy P. Roberts, Magdalena M. Siwek2019 · 4 citationsarXiv
The discovery of weak coherent pulsations in the ultraluminous X-ray source NGC 1313 X-21906.00640v1 · R. Sathyaprakash, T.P. Roberts, D. J. Walton et al.2019 · 163 citationsarXiv
Discovery of a radio transient in M811905.03449v2 · G. E. Anderson, J. C. A. Miller-Jones, M. J. Middleton et al.2019 · 9 citationsarXiv
The Lense-Thirring timing-accretion plane for ULXs1905.02731v3 · M. Middleton, P. C. Fragile, A. Ingram et al.2019 · 42 citationsarXiv
Thermal stability of winds driven by radiation pressure in super-Eddington accretion disks1903.06174v2 · Ciro Pinto, Missagh Mehdipour, Dom J. Walton et al.2019 · 41 citationsarXiv
Searching for intermediate-mass black holes in NGC33101812.05958v1 · Megan Argo, Joseph Coppola, Mar Mezcua et al.2018 · 2 citationsarXiv
A new, clean catalogue of extragalactic non-nuclear X-ray sources in nearby galaxies1812.04684v1 · H. P. Earnshaw, T. P. Roberts, M. J. Middleton et al.2018 · 72 citationsarXiv
A long hard-X-ray look at the dual active galactic nuclei of M51 with NuSTAR1805.12140v2 · M. Brightman, M. Balokovi'c, M. Koss et al.2018 · 22 citationsarXiv
Searching for propeller-phase ULXs in the XMM-Newton Serendipitous Source Catalogue1802.07753v1 · H. P. Earnshaw, T. P. Roberts, R. Sathyaprakash2018 · 51 citationsarXiv
Lense-Thirring precession in ULXs as a possible means to constrain the neutron star equation-of-state1711.07497v1 · M. J. Middleton, P. C. Fragile, M. Bachetti et al.2017 · 51 citationsarXiv
Optical and X-ray luminosity of expanding nebulae around ultraluminous X-ray sources1705.04235v1 · Magdalena Siwek, Aleksander Sadowski, Ramesh Narayan et al.2017 · 13 citationsarXiv
A Systematic Search for Near-Infrared Counterparts of Nearby Ultraluminous X-ray sources (II)1704.01068v1 · K. M. L'opez, M. Heida, P. G. Jonker et al.2017 · 22 citationsarXiv
Ultraluminous X-Ray Sources1703.10728v1 · Philip Kaaret, Hua Feng, Timothy P. Roberts2017 · 547 citationsarXivon Valency
Soft Extragalactic X-Ray Binaries at the Eddington Threshold1702.00313v1 · Hannah M. Earnshaw, Timothy P. Roberts2017 · 19 citationsarXiv
From ultraluminous X-ray sources to ultraluminous supersoft sources: NGC 55 ULX, the missing link1612.05569v2 · C. Pinto, W. Alston, R. Soria et al.2016 · 124 citationsarXiv
Spitzer IRAC observations of IR excess in Holmberg IX X-1: A circumbinary disk or a variable jet?1608.05348v1 · R. P. Dudik, C. T. Berghea, T. P. Roberts et al.2016 · 10 citationsarXiv
A 78 Day X-ray Period Detected from NGC 5907 ULX1 by Swift1607.07448v1 · D. J. Walton, F. Fuerst, M. Bachetti et al.2016 · 73 citationsarXiv
The X-ray spectral evolution of the ultraluminous X-ray source Holmberg IX X-11605.08246v1 · W. Luangtip (1, T. P. Roberts, C. Done2016 · 51 citationsarXiv
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