Browsing University of Hertfordshire by Author "García, Javier A."

Now showing items 1-5 of 5

    • The high energy X-ray probe ( HEX-P ): studying extreme accretion with ultraluminous X-ray sources 

      Bachetti, Matteo; Middleton, Matthew J.; Pinto, Ciro; Gúrpide, Andrés; Walton, Dominic J.; Brightman, Murray; Lehmer, Bret; Roberts, Timothy P.; Vasilopoulos, Georgios; Alford, Jason; Amato, Roberta; Ambrosi, Elena; Dai, Lixin; Earnshaw, Hannah P.; El Byad, Hamza; García, Javier A.; Luca Israel, Gian; Jaodand, Amruta; Madsen, Kristin; Maitra, Chandreyee; Mandel, Shifra; Mori, Kaya; Pintore, Fabio; Ohsuga, Ken; Pilia, Maura; Stern, Daniel; Younes, George; Wolter, Anna (2023-11-27)
      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 ...

    • The High Energy X-ray Probe (HEX-P): probing accretion onto stellar mass black holes 

      Connors, Riley M. T.; Tomsick, John A.; Draghis, Paul; Coughenour, Benjamin; Shaw, Aarran W.; García, Javier A.; Walton, Dominic; Madsen, Kristin; Stern, Daniel; Rodriguez, Nicole Cavero; Dauser, Thomas; Del Santo, Melania; Jiang, Jiachen; Krawczynski, Henric; Liu, Honghui; Neilsen, Joseph; Nowak, Michael; Pike, Sean; Santangelo, Andrea; Sridhar, Navin; West, Andrew; Wilms, Jörn (2024-01-08)
      Accretion is a universal astrophysical process that plays a key role in cosmic history, from the epoch of reionization to galaxy and stellar formation and evolution. Accreting stellar-mass black holes in X-ray binaries are ...

    • The high energy X-ray probe (HEX-P): probing the physics of the X-ray corona in active galactic nuclei 

      Kammoun, Elias; Lohfink, Anne M.; Masterson, Megan; Wilkins, Dan R.; Zhao, Xiurui; Balokovic, Mislav; Boorman, Peter G.; Connors, Riley; Coppi, Paolo; Fabian, Andrew; García, Javier A.; Madsen, Kristin K.; Rodriguez Cavero, Nicole; Sridhar, Navin; Stern, Daniel; Tomsick, John; Wevers, Thomas; Walton, Dominic J.; Bianchi, Stefano; Buchner, Johannes; Civano, Francesca M.; Lanzuisi, Giorgio; Mallick, Labani; Matt, Giorgio; Merloni, Andrea; Nardini, Emanuele; Piotrowska, Joanna M.; Ricci, Claudio; Wong, Ka-Wah; Zoghbi, Abderahmen (2024-01-05)
      The hard X-ray emission in active galactic nuclei (AGN) and black hole X-ray binaries is thought to be produced by a hot cloud of electrons referred to as the corona. This emission, commonly described by a power law with ...

    • The Nature of Soft Excess in ESO 362-G18 Revealed by XMM-Newton and NuSTAR Spectroscopy 

      Xu, Yerong; García, Javier A.; Walton, Dominic J.; Connors, Riley M. T.; Madsen, Kristin; Harrison, Fiona A. (2021-05-19)
      We present a detailed spectral analysis of the joint XMM-Newton and NuSTAR observations of the active galactic nuclei (AGN) in the Seyfert 1.5 Galaxy ESO 362-G18. The broadband ($0.3\mbox{--}79$ keV) spectrum shows the ...

    • The Tidal Disruption Event AT2021ehb : Evidence of Relativistic Disk Reflection, and Rapid Evolution of the Disk-Corona System 

      Yao, Yuhan; Lu, Wenbin; Guolo, Muryel; Pasham, Dheeraj R.; Gezari, Suvi; Gilfanov, Marat; Gendreau, Keith C.; Harrison, Fiona; Cenko, S. Bradley; Kulkarni, S. R.; Miller, Jon M.; Walton, Dominic J.; García, Javier A.; Velzen, Sjoert van; Alexander, Kate D.; Miller-Jones, James C. A.; Nicholl, Matt; Hammerstein, Erica; Medvedev, Pavel; Stern, Daniel; Ravi, Vikram; Sunyaev, R.; Bloom, Joshua S.; Graham, Matthew J.; Kool, Erik C.; Mahabal, Ashish A.; Masci, Frank J.; Purdum, Josiah; Rusholme, Ben; Sharma, Yashvi; Smith, Roger; Sollerman, Jesper (2022-09-15)
      We present X-ray, UV, optical, and radio observations of the nearby ($\approx78$ Mpc) tidal disruption event (TDE) AT2021ehb/ZTF21aanxhjv during its first 430 days of evolution. AT2021ehb occurs in the nucleus of a galaxy ...