My astrophysics research involves the application of novel data science methods to astronomical data. The main focus is time series analysis of light curves from accreting compact objects (black holes and neutron stars), where the goal is to understand gravity in the strong field regime, extreme physics and the role these objects play in shaping the universe. In particular, I use X-ray reverberation mapping and quasi-periodic oscillations (QPOs) to study matter spiralling in the inner accretion flow around a black hole. I am currently working on neural network methods to find important signals in the presence of red noise. Full CV here.
News and Press Releases
Work with me:
I'm hiring a Post-Doctoral Research Fellow to work with me in developing Machine Learning methods and applying them to black hole data, apply here. Deadline is January 29th 2024.I have a PhD position available to work on "Echo-mapping the spacetime around supermassive black holes" using novel ML methods, apply here. Deadline is Feb 28th 2024.
New position!
As of Jan 2023, I'm now a Senior Lecturer at the Centre for Astrophysics Research (CAR) at Universirty of Hertfordshire, UK. I will be developing and teaching Masters level modules based on the application of machine learning models to research and industry problems.I've recently hired a data scientist to work with me on machine learning applications to black hole data:
ESA Young Graduate Trainee See advert description here.
Formation of a black hole or neutron star seen for the first time in "The Cow" Nature Astronomy
Unraveling the inner accretion cone of the microquasar, SS433
X-ray reverberation paper reveals a dynamic black hole corona Nature Astronomy
Winner of UK homebrewer of the year, 2015
Recent Publications
- (55) A systematic study of the ultra-fast outflow responses to luminosity variations in active galactic nuclei (arXiv, ADS )
- Xu, Pinto, Rogantini, Barret, Bianchi, Guainazzi, Ebrero, Alston, Kara, Cusumano, 2024,
- (54) UV-Optical Disk Reverberation Lags despite a Faint X-Ray Corona in the Active Galactic Nucleus Mrk 335 (arXiv, ADS )
- Kara, Barth, Cackett, Gelbord, Montano, Li, Santana, Horne, Alston, et al, 2023, ApJ, 947, 62
- (53) X-ray Reverberation Mapping of Ark 564 using Gaussian Process Regression (arXiv, ADS )
- Lewin, Kara, Wilkins, Mastroserio, García, Zhang, Alston, Connors, Dauser, Fabian, Ingram, Jiang, Lohfink, Lucchini, Reynolds, Tombesi, van der Klis, Wang, 2022, ApJ, 939, 109
- (52) XMM-Newton observations of the narrow-line Seyfert 1 galaxy IRAS 13224-3809: X-ray spectral analysis II (arXiv, ADS )
- Jiang, Dauser, Fabian, Alston, Gallo, Parker, Reynolds, 2022, MNRAS, 514, 1107
- (51) High-density disc reflection spectroscopy of low-mass active galactic nuclei (arXiv, ADS )
- Mallick, Fabian, García, Tomsick, Parker, Dauser, Wilkins, De Marco, Steiner, Connors, Mastroserio, Markowitz, Pinto, Alston, Lohfink, Gandhi 2022, MNRAS, 513, 4361
- (50) Ejection-accretion connection in NLS1 AGN 1H 1934-063 (arXiv, ADS )
- Xu, Pinto, Kara, Masterson, García, Fabian, Parker, Barret, Alston, Cusumano 2022, MNRAS, 513, 1910
- (49) Evidence for a compact object in the aftermath of the extragalactic transient AT2018cow (arXiv, ADS, Nature Astronomy, Nat. Astron. free access)
- Dheeraj R. Pasham, Wynn C. G. Ho, William Alston, Ronald Remillard, Mason Ng, Keith Gendreau, Brian D. Metzger, Diego Altamirano, Deepto Chakrabarty, Andrew Fabian, Jon Miller, Peter Bult, Zaven Arzoumanian, James F. Steiner, Tod Strohmayer, Francesco Tombesi, Jeroen Homan, Edward M. Cackett, Alice Harding 2022, Nat.As 6, 249
- (48) The nature of the extreme X-ray variability in the NLS1 1H 0707-495 (arXiv, ADS)
- Parker, Alston, Härer, Igo, Joyce, Buisson, Chainakun, Fabian, Jiang, Kosec, Matzeu, Pinto, Xu, Zaidouni 2021, MNRAS, 508, 1798
- (47) The Chameleon on the branches: spectral state transition and dips in NGC 247 ULX-1 (arXiv, ADS)
- D'Aì, Pinto, Del Santo, Pintore, Soria, Robba, Ambrosi, Alston, Barret, Fabian, Fürst, Kara, Kosec, Middleton, Roberts, Rodriguez-Castillo, Walton 2021, MNRAS, 507, 5567
- (46) NuSTAR reveals the hidden nature of SS433 (arXiv, ADS)
- Middleton, Walton, Alston, Dauser, Eikenberry, Jiang, Fabian, Fuerst, Brightman, Marshall, Parker, Pinto, Harrison, Bachetti, Altamirano, Bird, Perez, Miller-Jones, Charles, Boggs, Christensen, Craig, Forster, Grefenstette, Hailey, Madsen, Stern, Zhang 2021, MNRAS, 506, 1045
- (45) Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1 (arXiv, ADS)
- Alston, Pinto, Barret, D'Ai, Del Santo, Earnshaw, Fabian, Fuerst, Kara, Kosec, Middleton, Parker, Pintore, Robba, Roberts, Sathyaprakash, Walton, Ambrosi 2021, MNRAS, 505, 3722
- (44) XMM-Newton campaign on the ultraluminous X-ray source NGC 247 ULX-1: outflows (arXiv, ADS)
- Pinto, Soria, Walton, D'Ai, Pintore, Kosec, Alston, Fuerst, Middleton, Roberts, Del Santo, Barret, Ambrosi, Robba, Earnshaw, Fabian 2021, MNRAS, 505, 5058
- (43) Extreme relativistic reflection in the active galaxy, ESO 033-G002 (arXiv, ADS)
- Walton, Baloković, Fabian, Gallo, Koss, Nardini, Reynolds, Ricci, Stern, Alston, Dauser, García, Kosec, Reynolds, Harrison, Miller 2021, MNRAS, 505, 1557
- (42) Broadband X-ray spectral variability of the pulsing ULX NGC 1313 X-2 (arXiv, ADS)
- Robba, Pinto, Walton, Soria, Kosec, Pintore, Roberts, Alston, Middleton, Cusumano, Earnshaw, Fuerst, Sathyaprakash, Kyritsis, Fabian 2021, A&A, 652, 118
- (41) Modelling the Multiwavelength Variability of Mrk 335 using Gaussian Processes (arXiv, ADS)
- Griffiths, Jiang, Buisson, Wilkins, Gallo, Ingram, Lee, Grupe, Kara, Parker, Alston, Bourached, Cann, Young, Komossa 2020, ApJ, 914, 144
- (40) Discovery of soft and hard X-ray time lags in low-mass AGNs (arXiv, ADS)
- Mallick, Wilkins, Alston, Markowitz, De Marco, Parker, Lohfink, Stalin 2020, MNRAS, 503, 3775
- (39) Modelling X-ray RMS spectra II: the ultra-fast outflow of PDS 456 (arXiv, ADS)
- Härer, Parker, Joyce, Igo, Alston, Fürst, Lobban, Matzeu, Reeves 2020, MNRAS, 500, 4506
- (38) A full characterization of the supermassive black hole in IRAS 09149-6206 (arXiv, ADS)
- Walton, Alston, Kosec, Fabian, Gallo, Garcia, Miller, Nardini, Reynolds, Ricci, Stern, Dauser, Harrison, Reynolds 2020, MNRAS, 499, 1480
- (37) Detection of a possible multiphase ultra-fast outflow in IRAS 13349+2438 with NuSTAR and XMM-Newton (arXiv, ADS)
- Parker, Matzeu, Alston, Fabian, Lobban, Miniutti, Pinto, Santos-Lleó, Schartel, 2020, MNRAS, 498, 140
- (36) The first broad-band X-ray view of the narrow-line Seyfert 1 Ton S180 (arXiv, ADS)
- Matzeu, Nardini, Parker, Reeves, Braito, Porquet, Middei, Kammoun, Lusso, Alston, Giustini, Lobban, Joyce, Igo, Ebrero, Ballo, Santos-Lleó, Schartel 2020, MNRAS 497, 2352
- (35) Characterising continuum variability in the radio-loud narrow-line Seyfert 1
galaxy IRAS 17020+4544 (arXiv, ADS) - Gonzalez, Gallo, Kosec, Fabian, Alston, Berton & Wilkins, 2020, MNRAS, 496, 3708
- (34) A dynamic black hole corona in an active galaxy through X-ray reverberation mapping (arXiv, ADS, Nature Astronomy, Nat. Astron. free access)
- Alston, Fabian, Kara, Parker, Dovciak, Pinto, Jiang, Middleton, Miniutti, Walton, Wilkins, Buisson, Caballero-Garcia, Cackett, De Marco, Gallo, Lohfink, Reynolds, Uttley, Young & Zogbhi, 2020, Nature Astronomy, 4, 597-602
- (33) Blueshifted absorption lines from X-ray reflection in IRAS 13224-3809 (arXiv, ADS)
- Fabian, Reynolds, Jiang, Pinto, Gallo, Parker, Lasenby, Alston, Buisson, Cackett, De Marco, Garcia, Kara, Kosec, Middleton, Miller, Miniutti, Walton, Wilkins, Young, 2020, MNRAS, 493, 2518
- (32) Searching for Ultra-fast Outflows in AGN using Variability Spectra (arXiv, ADS)
- Igo, Parker, Matzeu, Alston, Alvarez Crespo, Buisson, Fürst, Joyce, Mallick, Schartel, Santos-Lleó, 2020, MNRAS, 493, 1088
- (31) Modelling X-ray RMS spectra I: intrinsically variable AGN (arXiv, ADS)
- Parker, Alston, Igo & Fabian 2020, MNRAS, 492, 1363
- (30) The Unusual Broadband X-ray Spectral Variability of NGC 1313 X-1 seen with XMM-Newton, Chandra and NuSTAR (arXiv, ADS)
- Walton, Pinto, Nowak, Bachetti, Sathyaprakash, Kara, Roberts, Soria, Brightman, Canizares, Earnshaw, Fürst, Heida, Middleton, Stern, Tao, Webb, Alston, Barret, Fabian, Harrison, Kosec, 2020, MNRAS, 494, 6012
- (29) XMM-Newton Campaign On Ultraluminous X-ray Source NGC 1313 X-1: Wind vs. State Variability (arXiv, ADS)
- Pinto, Walton, Kara, Parker, Soria, Kosec, Middleton, Alston, Fabian, Guainazzi, Roberts, Fuerst, Earnshaw, Sathyaprakash & Barret, 2020, MNRAS, 492, 4646
- (28) Discovery of a soft X-ray lag in the Ultraluminous X-ray Source NGC 1313 X-1 (arXiv, ADS)
- Kara, Pinto, Walton, Alston, Bachetti, Barret, Brightman, Canizares, Earnshaw, Fabian, Furst, Kosec, Middleton, Roberts, Soria, Tao & Webb, 2020, MNRAS, 491, 5172
- (27) The discovery of weak coherent pulsations in the ultraluminous X-ray source NGC 1313 X-2 (arXiv, ADS)
- Sathyaprakash, Roberts, Walton, Fuerst, Bachetti, Pinto,
Alston, Earnshaw, Fabian, Middleton & Soria, 2019, MNRAS, 488, 35 - (26) Non-stationary variability in accreting compact objects (arXiv, ADS)
- Alston, 2019, MNRAS, 485, 260
- (25) The remarkable X-ray variability of IRAS 13224--3809 I: the variability process (arXiv, ADS)
- Alston, Fabian, Buisson, Kara, Parker, Lohfink, Uttley, Wilkins, Pinto, De Marco, Cackett, Middleton, Walton, Reynolds, Jiang, Gallo, Zogbhi, Miniutti, Dovciak & Young, 2019, MNRAS, 482, 2088
- (24) A high-density relativistic reflection origin for the soft and hard
X-ray excess emission from Mrk 1044 (arXiv, ADS) - Mallick, Alston, Parker, Fabian, Pinto, Dewangan, Markowitz, Gandhi, Kembhavi & Misra, 2018, MNRAS, 479, 615
- (23) The 1.5 Ms Observing Campaign on IRAS 13224-3809: X-ray Spectral Analysis I (arXiv, ADS)
- Jiang, Parker, Fabian, Alston, Buisson, Cackett, Chiang, Dauser, Gallo, García, Harrison, Lohfink, De Marco, Kara, Miller, Miniutti, Pinto, Walton & Wilkins, 2018, MNRAS, 477, 3711
- (22) Ultrafast outflows disappear in high radiation fields (arXiv, ADS)
- Pinto, Alston, Parker, Fabian, Gallo, Buisson, Walton, Kara, Jiang, Lohfink & Reynolds, 2018, MNRAS, 476, 1021
- (21) Is there a UV/X-ray connection in IRAS 13224-3809? (arXiv, ADS)
- Buisson, Lohfink, Alston, Cackett, Chiang, Dauser, De Marco, Fabian, Gallo, García, Jiang, Kara, Middleton, Miniutti, Parker, Pinto, Uttley, Walton & Wilkins, 2018, MNRAS, 475, 2306
- (20) Revealing the ultra-fast outflow in IRAS 13224-3809 through spectral variability (arXiv, ADS)
- Parker, Alston, Buisson, Fabian, Jiang, Kara, Lohfink, Pinto & Reynolds, 2017, MNRAS, 469, 1553
- (19) The response of relativistic outflowing gas to the inner accretion disk of a black hole (arXiv, ADS, Nature)
- Parker, Pinto, Fabian, Lohfink, Buisson, Alston, Kara, Cackett, Chiang, Dauser, De Marco, Gallo, Garcia, Harrison, King, Middleton, Miller, Miniutti, Reynolds, Uttley, Vasudevan, Walton, Wilkins & Zoghbi, 2017, Nature, 543, 83
- (18) From ultraluminous X-ray sources to ultraluminous supersoft
sources: NGC 55 ULX, the missing link (arXiv, ADS) - Pinto, Alston, Soria, Middleton, Walton, Sutton, Fabian, Earnshaw, Urquhart, Kara & Roberts, 2017, MNRAS, 468, 2865
- (17) The Future of X-ray Reverberation from AGN (arXiv, ADS)
- Fabian, Alston, Cackett, Kara, Uttley & Wilkins, 2016, Astro. Nach., 338, 269
- (16) Ultraviolet and X-ray variability of active galactic nuclei with Swift (arXiv, ADS)
- Buisson, Lohfink, Alston & Fabian, 2016, MNRAS, 464, 3194
- (15) False periodicities in quasar time-domain surveys (arXiv, ADS)
- Vaughan, Uttley, Markowitz, Huppenkothen, Middleton, Alston, Scargle & Farr, 2016, MNRAS, 461, 3145
- (14) A global look at X-ray time lags in Seyfert Galaxies (arXiv, ADS)
- Kara, Alston, Fabian, Cackett, Uttley, Reynolds & Zoghbi, 2016, MNRAS, 462, 511
- (13) Quasi periodic oscillations in active galactic nuclei (arXiv, ADS)
- Alston, Fabian, Markeviciute, Parker, Middleton & Kara, 2016, Astro. Nach., 337, 417
- (12) A global look at X-ray time lags in Seyfert Galaxies (arXiv, ADS)
- Kara, Alston & Fabian, 2016, Astro. Nach., 337, 473
- (11) The Rhythm of Fairall 9. I. Observing the Spectral Variability with XMM-Newton and NuSTAR (arXiv, ADS)
- Lohfink, Reynolds, Pinto, Alston, Boggs, Christensen, Craig, Fabian, Hailey, Harrison, Kara,
Matt, Parker, Stern, Walton & Zhang, 2016, ApJ, 821, 11 - (10) NuSTAR and Suzaku observations of the hard state in Cygnus X-1:
locating the inner accretion disk (arXiv, ADS) - Parker, Tomsick, Miller, Yamaoka, Lohfink, Nowak, Fabian, Alston, Boggs, Christensen, Craig, Fuerst, Gandhi, Grefenstette, Grinberg, Hailey, Harrison, Kara, King, Stern, Walton, Wilms & Zhang, 2015, ApJ, 808, 9
- (9) Discovery of a ~2 hr high frequency X-ray QPO and iron K alpha reverberation in
the active galaxy MS 2254.9-3712 (arXiv, ADS) - Alston, Parker, Markeviciute, Fabian, Middleton, Lohfink, Kara & Pinto, 2015, MNRAS, 449, 467
- (8) Revealing the X-ray variability of AGN with principal component analysis (arXiv, ADS)
- Parker, Fabian, Matt, Koljonen, Kara, Alston, Walton, Marinucci, Brenneman & Risaliti, 2015, MNRAS, 447, 72
- (7) X-ray time delays from the Seyfert 2 galaxy IRAS 18325-5926 (arXiv, ADS)
- Lobban, Alston & Vaughan, 2014, MNRAS, 445, 3229
- (6) Detection of a QPO in five XMM-Newton observations of RE J1034+396 (arXiv, ADS)
- Alston, Markevičiūtė, Kara, Fabian & Middleton, 2014, MNRAS, 445, 16
- (5) The changing X-ray time lag in MCG-6-30-15 (arXiv, ADS)
- Kara, Fabian, Marinucci, Matt, Parker, Alston, Brenneman, Cackett & Miniutti, 2014, MNRAS, 445, 56
- (4) A non-thermal study of the brightest cluster galaxy NGC 1275 - the Gamma-Radio connection
over four decades (arXiv, ADS) - Dutson, Edge, Hinton, Hogan, Gurwell & Alston, 2014, MNRAS, 442, 2048
- (3) X-ray time delays in the narrow line Seyfert 1 galaxy PG 1244+026 (arXiv, ADS)
- Alston, Done & Vaughan, 2014, MNRAS, 439, 1548
- (2) The flux-dependent X-ray time lags in NGC 4051 (arXiv, ADS)
- Alston, Vaughan & Uttley, 2013, MNRAS, 435, 1511
- (1) Ultraviolet and X-ray variability of NGC 4051 over 45 days with XMM-Newton and Swift (arXiv, ADS)
- Alston, Vaughan & Uttley, 2013, MNRAS, 429, 75
Curriculum Vitae
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