Publications by authors named "D Wik"
We present 15 high-mass X-ray binary (HMXB) candidates in the disk of M31 for which we are able to infer compact object type, spectral type of the donor star, and age using multiwavelength observations from , , and the . The hard X-ray colors and luminosities from permit the tentative classification of accreting X-ray binary systems by compact object type, distinguishing black hole from neutron star systems. We find hard-state black holes, pulsars, and non-magnetized neutron stars associated with optical point-source counterparts with similar frequency.
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- The Galactic Centre features a unique group of young, massive stars near the supermassive black hole, Sagittarius A*, raising questions about stellar formation there.
- Previous research argued that soft X-ray emissions in the area are largely from accreting white dwarf systems, but limitations in detection technology have hindered the observation of hard X-ray emissions.
- New findings reveal a concentrated hard-X-ray emission in a small region, suggesting complex interactions involving more massive accreting white dwarfs, low-mass X-ray binaries, or new types of particle interactions, challenging our understanding of stellar evolution and cosmic phenomena in that region.
Asymmetry is required by most numerical simulations of stellar core-collapse explosions, but the form it takes differs significantly among models. The spatial distribution of radioactive (44)Ti, synthesized in an exploding star near the boundary between material falling back onto the collapsing core and that ejected into the surrounding medium, directly probes the explosion asymmetries. Cassiopeia A is a young, nearby, core-collapse remnant from which (44)Ti emission has previously been detected but not imaged.
View Article and Find Full Text PDFIntroduction: Fabry's disease is associated with an increased incidence of thrombotic events and rejection. Spontaneous thrombosis of a functioning cadaveric renal allograft in a recipient with Fabry's disease prompted prospective evaluation of all transplant candidates with Fabry's disease for hypercoagulability.
Materials And Methods: Transplant candidates with Fabry's disease were tested for hypercoagulability, analyzed for HLA-type and ABO group, and comorbid conditions suggestive of hypercoagulability.