0000000000187289

AUTHOR

J. A. Kennea

showing 3 related works from this author

On Relativistic Disk Spectroscopy in Compact Objects with X-ray CCD Cameras

2010

X-ray charge-coupled devices (CCDs) are the workhorse detectors of modern X-ray astronomy. Typically covering the 0.3-10.0 keV energy range, CCDs are able to detect photoelectric absorption edges and K shell lines from most abundant metals. New CCDs also offer resolutions of 30-50 (E/dE), which is sufficient to detect lines in hot plasmas and to resolve many lines shaped by dynamical processes in accretion flows. The spectral capabilities of X-ray CCDs have been particularly important in detecting relativistic emission lines from the inner disks around accreting neutron stars and black holes. One drawback of X-ray CCDs is that spectra can be distorted by photon "pile-up", wherein two or mor…

PhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)PhotonSpectrometerAstrophysics::High Energy Astrophysical PhenomenaElectron shellFOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsGeneral Relativity and Quantum Cosmology (gr-qc)General Relativity and Quantum CosmologyRelativistic diskSpectral lineaccretion accretion disks black hole physics instrumentation spectrographs methods analytical X-rays binariesNeutron starSettore FIS/05 - Astronomia E AstrofisicaSpace and Planetary ScienceEmission spectrumAstrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical PhenomenaSpectroscopyAstrophysics::Galaxy Astrophysics
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Discovery and Identification of MAXI J1621-501 as a Type I X-Ray Burster with a Super-orbital Period

2019

MAXI J1621-501 is the first Swift/XRT Deep Galactic Plane Survey transient that was followed up with a multitude of space missions (NuSTAR, Swift, Chandra, NICER, INTEGRAL, and MAXI) and ground-based observatories (Gemini, IRSF, and ATCA). The source was discovered with MAXI on 2017 October 19 as a new, unidentified transient. Further observations with NuSTAR revealed 2 Type I X-ray bursts, identifying MAXI J1621-501 as a Low Mass X-ray Binary (LMXB) with a neutron star primary. Overall, 24 Type I bursts were detected from the source during a 15 month period. At energies below 10 keV, the source spectrum was best fit with three components: an absorbed blackbody with kT = 2.3 keV, a cutoff p…

PhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)010504 meteorology & atmospheric sciencesX-ray bursterX-ray transient sourceAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsGalactic planeX-ray bursterLight curveOrbital period01 natural sciencesLow-mass X-ray binary starNeutron starSettore FIS/05 - Astronomia E AstrofisicaSpace and Planetary Science0103 physical sciencesRadiative transferEmission spectrumLow MassAstrophysics - High Energy Astrophysical Phenomena010303 astronomy & astrophysics0105 earth and related environmental sciencesAstrophysical Journal
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Swift follow-up of IceCube triggers, and implications for the Advanced-LIGO era

2015

Between 2011 March and 2014 August Swift responded to 20 triggers from the IceCube neutrino observatory, observing the IceCube 50% confidence error circle in X-rays, typically within 5 hours of the trigger. No confirmed counterpart has been detected. We describe the Swift follow up strategy and data analysis and present the results of the campaign. We discuss the challenges of distinguishing the X-ray counterpart to a neutrino trigger from serendipitous uncatalogued X-ray sources in the error circle, and consider the implications of our results for future strategies for multi-messenger astronomy, with particular reference to the follow up of gravitational wave triggers from the advanced-era…

PhysicsSwiftHigh Energy Astrophysical Phenomena (astro-ph.HE)Astrophysics::High Energy Astrophysical PhenomenaAstronomyLibrary scienceFOS: Physical sciencesAstronomy and AstrophysicsMethods observationalLIGOSpace and Planetary Scienceddc:520Astrophysics - High Energy Astrophysical Phenomenacomputercomputer.programming_language
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