F. J. Cowie

ORCID: 0009-0009-0079-2419
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Research Areas
  • Particle Accelerators and Free-Electron Lasers
  • Astrophysics and Cosmic Phenomena
  • Radio Astronomy Observations and Technology
  • Particle Detector Development and Performance
  • Crystallography and Radiation Phenomena
  • Cavitation Phenomena in Pumps
  • Cholangiocarcinoma and Gallbladder Cancer Studies
  • Colorectal and Anal Carcinomas
  • Galaxies: Formation, Evolution, Phenomena
  • Nuclear Physics and Applications
  • Astronomy and Astrophysical Research
  • Multiple and Secondary Primary Cancers
  • Gamma-ray bursts and supernovae

University of Oxford
2024

University of Manchester
2022-2023

Netherlands Institute for Radio Astronomy
2023

Abstract Fast X-ray Transients (FXTs) are extragalactic bursts of soft X-rays first identified ≳10 yr ago. Since then, nearly 40 events have been discovered, although almost all these recovered from archival Chandra and XMM-Newton data. To date, optical sky surveys follow-up searches not revealed any multiwavelength counterparts. The Einstein Probe, launched in 2024 January, has started surveying the regime (0.5–4 keV) will rapidly increase sample FXTs discovered real time. Here we report...

10.3847/2041-8213/ad55cd article EN cc-by The Astrophysical Journal Letters 2024-06-26

ABSTRACT The origin of the radio synchrotron background (RSB) is currently unknown. Its understanding might have profound implications in fundamental physics or reveal a new class emitters. In this work, we consider scenario which RSB due to extragalactic sources and measure angular cross-correlation Low-Frequency Array (LOFAR) images diffuse sky with matter tracers at different redshifts, provided by galaxy catalogues cosmic microwave lensing. We compare these measured cross-correlations...

10.1093/mnras/stae876 article EN cc-by Monthly Notices of the Royal Astronomical Society 2024-03-26

We present the largest low frequency (120~MHz) arcminute resolution image of radio synchrotron background (RSB) to date, and its corresponding angular power spectrum anisotropies (APS) with scales ranging from $3^\circ$ $0.3^\prime$. show that RSB around North Celestial Pole has a significant excess anisotropy at all over model unclustered point sources based on source counts known classes. This excess, which does not seem attributable diffuse Galactic emission, could be linked surface...

10.1093/mnras/stad1671 article EN cc-by Monthly Notices of the Royal Astronomical Society 2023-06-13

Fast X-ray Transients (FXTs) are extragalactic bursts of soft X-rays first identified >10 years ago. Since then, nearly 40 events have been discovered, although almost all these recovered from archival Chandra and XMM-Newton data. To date, optical sky surveys follow-up searches not revealed any multi-wavelength counterparts. The Einstein Probe, launched in January 2024, has started surveying the regime (0.5-4 keV) will rapidly increase sample FXTs discovered real time. Here, we report...

10.48550/arxiv.2404.10660 preprint EN arXiv (Cornell University) 2024-04-16

We present the largest low frequency (120~MHz) arcminute resolution image of radio synchrotron background (RSB) to date, and its corresponding angular power spectrum anisotropies (APS) with scales ranging from $3^\circ$ $0.3^\prime$. show that RSB around North Celestial Pole has a significant excess anisotropy at all over model unclustered point sources based on source counts known classes. This excess, which does not seem attributable diffuse Galactic emission, could be linked surface...

10.48550/arxiv.2306.00829 preprint EN other-oa arXiv (Cornell University) 2023-01-01

The origin of the radio synchrotron background (RSB) is currently unknown. Its understanding might have profound implications in fundamental physics or reveal a new class emitters. In this work, we consider scenario which RSB due to extragalactic sources and measure angular cross-correlation LOFAR images diffuse sky with matter tracers at different redshifts, provided by galaxy catalogs CMB lensing. We compare these measured cross-correlations those expected for models sources. find that...

10.48550/arxiv.2311.17641 preprint EN public-domain arXiv (Cornell University) 2023-01-01

e14671 Background: The most commonly used prognostic criteria over the last few years has been NIH criteria. However, there have limitations specifically in heterogeneity of tumors high-risk category and overlap overall survival between low intermediate-risk groups. Emphasis changed to an alternative system devised by Armed Forces Institute Pathology (AFIP). Its main difference is that it includes addition tumour site as a factor. Our population study aims provide data relation AFIP Methods:...

10.1200/jco.2010.28.15_suppl.e14671 article EN Journal of Clinical Oncology 2010-05-20

Abstract We briefly consider the history of maser variability, and flaring variability specifically. six proposed flare generation mechanisms, model them computationally with codes that include saturation 3-D structure (the last mechanism is modelled in 1-D). Fits to observational light curves have been made for some sources, we suggest a small number parameters can diagnose many cases. The strongest flares arise from mechanisms increase density inverted molecules addition by geometrical...

10.1017/s1743921323002399 article EN Proceedings of the International Astronomical Union 2022-12-01
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