Browsing University of Hertfordshire by Author "Fuerst, F."

Now showing items 1-4 of 4

    • The high energy X-ray probe (HEX-P): a new window into neutron star accretion 

      Ludlam, R. M.; Malacaria, C.; Sokolova-Lapa, E.; Fuerst, F.; Pradhan, P.; Shaw, A. W.; Pottschmidt, K.; Pike, S.; Vasilopoulos, G.; Wilms, J.; García, J. A.; Madsen, K.; Stern, D.; Maitra, C.; Del Santo, M.; Walton, D. J.; Brumback, M. C.; van den Eijnden, J. (2023-12-12)
      Accreting neutron stars (NSs) represent a unique laboratory for probing the physics of accretion in the presence of strong magnetic fields (B ≳ 108 G). Additionally, the matter inside the NS itself exists in an ultra-dense, ...

    • Long-term pulse period evolution of the ultra-luminous X-ray pulsar NGC 7793 P13 

      Fuerst, F.; Walton, D. J.; Heida, M.; Bachetti, M.; Pinto, C.; Middleton, M. J.; Brightman, M.; Earnshaw, H. P.; Barret, D.; Fabian, A. C.; Kretschmar, P.; Pottschmidt, K.; Ptak, A.; Roberts, T.; Stern, D.; Webb, N.; Wilms, J. (2021-07-16)
      Ultra-luminous X-ray pulsars (ULXPs) provide a unique opportunity to study super-Eddington accretion. We present the results of a monitoring campaign of ULXP NGC 7793 P13. Over our four-year monitoring campaign with Swift, ...

    • Probing the nature of the low state in the extreme ultraluminous X-ray pulsar NGC 5907 ULX1 

      Fuerst, F.; Walton, D. J.; Israel, Gian Luca; Bachetti, M.; Barret, D.; Brightman, Murray; Earnshaw, H. P.; Fabian, A.; Heida, M.; Imbrogno, M.; Middleton, M. J.; Pinto, C.; Salvaterra, R.; Roberts, T. P.; Castillo, G. A. Rodríguez; Webb, N. (2023-04-12)
      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 ...

    • Unveiling the disc structure in ultraluminous X-ray source NGC 55 ULX-1 

      Barra, F.; Pinto, C.; Walton, D. J.; Kosec, P.; D'Aì, A.; Salvo, T. Di; Santo, M. Del; Earnshaw, H.; Fabian, A. C.; Fuerst, F.; Marino, A.; Pintore, F.; Robba, A.; Roberts, T. P. (2022-11-01)
      Despite two decades of studies, it is still not clear whether ULX spectral transitions are due to stochastic variability in the wind or variations in the accretion rate or in the source geometry. The compact object is also ...