Projects per year
Personal profile
Research interests
My research primarily focuses on studying the X-ray emission from actively accreting black holes and neutron stars, particularly with the NuSTAR X-ray observatory, but also with other facilities like XMM-Newton, Chandra and Swift.
More information can be found here!
Education/Academic qualification
Astrophysics, PhD, X-ray Emission and Re ection from Accreting Black Holes, HEI: University of Cambridge
2008 → 2012
Award Date: 20 Jul 2013
Physics & Astronomy, Msci, HEI: University of Durham
2004 → 2008
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Projects
- 1 Active
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ULXPULSAR1: Ultraluminous X-ray Pulsars: The Extremes of Accretion
Walton, D. (PI)
1/04/24 → 31/03/27
Project: Research
Research output
- 68 Article
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A new broad-band spectral state in the ultraluminous X-ray source Holmberg IX X-1
Walton, D. J., Bachetti, M., Kosec, P., Fürst, F., Pinto, C., Roberts, T. P., Soria, R., Stern, D., Alston, W. N., Brightman, M., Earnshaw, H. P., Fabian, A. C., Harrison, F. A., Middleton, M. J. & Sathyaprakash, R., 30 Sept 2025, (E-pub ahead of print) In: Monthly Notices of the Royal Astronomical Society. 543, 3, p. 2902-2916 15 p.Research output: Contribution to journal › Article › peer-review
Open AccessFile -
The broad-band view of the bare Seyfert PG 1426+015: relativistic reflection, the soft excess, and the importance of oxygen
Walton, D. J., Madathil-Pottayil, A., Kosec, P., Jiang, J., Garcia, J., Fabian, A. C., Pinto, C., Buisson, D. J. K., Parker, M. L., Alston, W. N. & Reynolds, C. S., 30 Sept 2025, (E-pub ahead of print) In: Monthly Notices of the Royal Astronomical Society. 543, 3, p. 2633-2648 16 p.Research output: Contribution to journal › Article › peer-review
Open AccessFile -
The Broadband View of the Bare Seyfert PG 1426+015: Relativistic Reflection, the Soft Excess and the Importance of Oxygen
Walton, D. J., Madathil-Pottayil, A., Kosec, P., Jiang, J., Garcia, J., Fabian, A. C., Pinto, C., Buisson, D. J. K., Parker, M. L., Alston, W. N. & Reynolds, C. S., 10 Sept 2025, (Accepted/In press) In: Monthly Notices of the Royal Astronomical Society (MNRAS).Research output: Contribution to journal › Article › peer-review
Open AccessFile -
A NuSTAR Study of Quasiperiodic Oscillations from the Ultraluminous X-Ray Sources in M82
El Byad, H., Bachetti, M., Columbu, S., Rodriguez, G., Pilia, M., Middleton, M. J., Walton, D. J., Brightman, M., Earnshaw, H., Forster, K., Grefenstette, B., Fürst, F., Heida, M., Imbrogno, M., Lai, E. V. & Maccarone, T., 20 Aug 2025, In: The Astrophysical Journal. 989, 2, 13 p., 202.Research output: Contribution to journal › Article › peer-review
Open AccessFile1 Citation (Scopus) -
XMM-Newton Conclusively Identifies an Active Galactic Nucleus in a Green Pea Galaxy * * Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA
Boorman, P. G., Svoboda, J., Stern, D., Lehmer, B. D., Borkar, A., Brightman, M., Earnshaw, H. P., Harrison, F. A., Kouroumpatzakis, K., Adamcová, B., Assef, R. J., Ehle, M., Grefenstette, B., Grossová, R., Gupta, M., Kammoun, E., Kawamuro, T., Marcotulli, L., Mikušincová, R. & Middleton, M. J. & 6 others, , 1 Aug 2025, In: The Astrophysical Journal. 988, 2, 20 p.Research output: Contribution to journal › Article › peer-review
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