0000000000848783

AUTHOR

C. B. Markwardt

showing 2 related works from this author

NuSTAR and NICER reveal IGR J17591-2342 as a new accreting millisecond X-ray pulsar

2018

We report the discovery by the Nuclear Spectroscopic Telescope Array (NuSTAR) and the Neutron Star Interior Composition Explorer (NICER) of the accreting millisecond X-ray pulsar IGR J17591-2342. Coherent X-ray pulsations around 527.4 Hz (1.9 ms) with a clear Doppler modulation were detected. This implies an orbital period of ∼8.8 h and a projected semi-major axis of ∼1.23 lt-s. With the binary mass function, we estimate a minimum companion mass of 0.42 M, obtained assuming a neutron star mass of 1.4[subscript ⊙] and an inclination angle lower than 60°, as suggested by the absence of eclipses or dips in the light curve of the source. The broad-band energy spectrum, obtained by combining NuS…

AccretionAstrophysics::High Energy Astrophysical Phenomenageneral [Pulsars]FOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesSpectral linelaw.inventionTelescopeX-rays: binariesSettore FIS/05 - Astronomia E AstrofisicaPulsarlow-mass [Stars]lawstars: low-mass0103 physical sciencesStars: low-maAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Neutron Star Interior Composition Explorer010308 nuclear & particles physicsComputer Science::Information Retrievalaccretion disksneutron [Stars]Astronomy and AstrophysicsAstronomy and AstrophysicOrbital periodLight curveX-rays: binarieStars: neutronNeutron starPulsars: generalAccretion diskSpace and Planetary ScienceAccretion disksbinaries [X-rays]Astrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical Phenomena[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]X-ray pulsar
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First Multi-wavelength Campaign on the Gamma-ray-loud Active Galaxy IC 310

2017

The extragalactic VHE gamma-ray sky is rich in blazars. These are jetted active galactic nuclei viewed at a small angle to the line-of-sight. Only a handful of objects viewed at a larger angle are known so far to emit above 100 GeV. Multi-wavelength studies of such objects up to the highest energies provide new insights into the particle and radiation processes of active galactic nuclei. We report the results from the first multi-wavelength campaign observing the TeV detected nucleus of the active galaxy IC 310, whose jet is observed at a moderate viewing angle of 10 deg - 20 deg. The multi-instrument campaign was conducted between 2012 Nov. and 2013 Jan., and involved observations with MAG…

Active galactic nucleusAstronomyAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesEnergy fluxAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsGalaxies: active; Galaxies: individual: IC 310; Gamma rays: galaxies; Astronomy and Astrophysics; Space and Planetary Science01 natural scienceslaw.inventionlawGalaxies: individual: IC 3100103 physical sciencesindividual: IC 310 [galaxies]Blazar010303 astronomy & astrophysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Physicsgalaxie [Gamma rays]010308 nuclear & particles physicsGamma rayAstronomy and AstrophysicsGalaxies: activeAstronomy and AstrophysicAstrophysics - Astrophysics of GalaxiesSynchrotrongamma rays: galaxies ; galaxies: active ; individual (IC 310)Gamma rays: galaxiesSpace and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)active [galaxies]galaxies [gamma rays]ComputingMethodologies_DOCUMENTANDTEXTPROCESSINGSpectral energy distributionddc:520Astrophysics - High Energy Astrophysical PhenomenaFermi Gamma-ray Space TelescopeFlare
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