Outputs (5)

The high energy X-ray probe ( HEX-P ): studying extreme accretion with ultraluminous X-ray sources (2023)
Journal Article
Bachetti, M., Middleton, M. J., Pinto, C., Gúrpide, A., Walton, D. J., Brightman, M., …Wolter, A. (2023). The high energy X-ray probe ( HEX-P ): studying extreme accretion with ultraluminous X-ray sources. Frontiers in Astronomy and Space Sciences, 10, Article 1289432. https://doi.org/10.3389/fspas.2023.1289432

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 evi... Read More about The high energy X-ray probe ( HEX-P ): studying extreme accretion with ultraluminous X-ray sources.

Digging a little deeper: characterizing three new extreme ULX candidates (2023)
Journal Article
Roberts, T. P., Walton, D. J., Mackenzie, A. D. A., Heida, M., & Scaringi, S. (2023). Digging a little deeper: characterizing three new extreme ULX candidates. Monthly Notices of the Royal Astronomical Society, 525(3), 3330-3343. https://doi.org/10.1093/mnras/stad2367

A prime motivation for compiling catalogues of any celestial X-ray source is to increase our numbers of rare subclasses. In this work, we take a recent multimission catalogue of ultraluminous X-ray sources (ULXs) and look for hitherto poorly-studied... Read More about Digging a little deeper: characterizing three new extreme ULX candidates.

The Large Deficit of HMXB Emission from Luminous Infrared Galaxies: The Case of the Circumnuclear Starburst Ring in NGC 7552 (2023)
Journal Article
West, L., Garofali, K., Lehmer, B. D., Prestwich, A., Eufrasio, R., Luangtip, W., …Zezas, A. (2023). The Large Deficit of HMXB Emission from Luminous Infrared Galaxies: The Case of the Circumnuclear Starburst Ring in NGC 7552. Astrophysical Journal, 952(1), Article 22. https://doi.org/10.3847/1538-4357/acd9aa

Luminous infrared galaxies (LIRGs), the most extreme star-forming galaxies in the nearby (D < 30 Mpc) universe, show a notable X-ray emission deficiency (up to a factor of ∼10) compared with predictions from scaling relations of galaxy-wide high-mass... Read More about The Large Deficit of HMXB Emission from Luminous Infrared Galaxies: The Case of the Circumnuclear Starburst Ring in NGC 7552.

Probing the nature of the low state in the extreme ultraluminous X-ray pulsar NGC 5907 ULX1 (2023)
Journal Article
Fürst, F., Walton, D. J., Israel, G. L., Bachetti, M., Barret, D., Brightman, M., …Webb, N. (2023). Probing the nature of the low state in the extreme ultraluminous X-ray pulsar NGC 5907 ULX1. Astronomy & Astrophysics, 672, Article A140. https://doi.org/10.1051/0004-6361/202245048

NGC 5907 ULX1 is the most luminous ultra-luminous X-ray pulsar (ULXP) known to date, reaching luminosities in excess of 1041 erg s−1. The pulsar is known for its fast spin-up during the on-state. Here, we present a long-term monitoring of the X-ray f... Read More about Probing the nature of the low state in the extreme ultraluminous X-ray pulsar NGC 5907 ULX1.

The hyperluminous X‐ray source population (2023)
Journal Article
MacKenzie, A., Roberts, T., & Walton, D. (2023). The hyperluminous X‐ray source population. Astronomische Nachrichten, 344(4), Article e230028. https://doi.org/10.1002/asna.20230028

We have recently published a catalog of 1843 candidate ultraluminous X-ray sources (ULXs). This is the largest catalog of ULXs to date and was built by cross-correlating recent serendipitous source catalogs from the XMM-Newton, Swift, and Chandra obs... Read More about The hyperluminous X‐ray source population.