0000000000385474

AUTHOR

Jay Blanchard

showing 3 related works from this author

The TANAMI Multiwavelength Program: Dynamic SEDs of Southern Blazars

2016

Simultaneous broadband spectral and temporal studies of blazars are an important tool for investigating active galactic nuclei (AGN) jet physics. We study the spectral evolution between quiescent and flaring periods of 22 radio-loud AGN through multi-epoch, quasi-simultaneous broadband spectra. For many of these sources these are the first broadband studies. We use a Bayesian block analysis of \Fermi/LAT light curves in order to determine time ranges of constant flux for constructing quasi-simultaneous SEDs. The shapes of the resulting 81 SEDs are described by two logarithmic parabolas and a blackbody spectrum where needed. For low states the peak frequencies and luminosities agree well wit…

High Energy Astrophysical Phenomena (astro-ph.HE)Astrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics - High Energy Astrophysical PhenomenaAstrophysics::Galaxy Astrophysics
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Radio and gamma-ray properties of extragalactic jets from the TANAMI sample

2016

Using high-resolution radio imaging with VLBI techniques, the TANAMI program has been observing the parsec-scale radio jets of southern (declination south of -30{\deg}) gamma-ray bright AGN simultaneously with Fermi/LAT monitoring of their gamma-ray emission. We present the radio and gamma-ray properties of the TANAMI sources based on one year of contemporaneous TANAMI and Fermi/LAT data. A large fraction (72%) of the TANAMI sample can be associated with bright gamma-ray sources for this time range. Association rates differ for different optical classes with all BL Lacs, 76% of quasars and just 17% of galaxies detected by the LAT. Upper limits were established on the gamma-ray flux from TAN…

AstrofísicaBrightnessCosmology and Nongalactic Astrophysics (astro-ph.CO)010504 meteorology & atmospheric sciencesAstronomyAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics01 natural sciencesDeclinationRadio continuum: galaxies0103 physical sciencesVery-long-baseline interferometryGalaxies; Interferometry; Luminance; Radio astronomy; Temperature Galaxies : active; Galaxies: nuclei; Galaxies:jets; Gamma rays: galaxies; Radio continuum: galaxies Gamma rays; Galaxies: active; Galaxies: jets; Galaxies: nuclei; Gamma rays: galaxies; Radio continuum: galaxiesRadio astronomyBlazar010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsGalaxies: nuclei0105 earth and related environmental sciencesHigh Energy Astrophysical Phenomena (astro-ph.HE)PhysicsGalaxies : activeGalaxies:jetsGamma raysTemperatureGamma rayAstronomy and AstrophysicsQuasarGalaxies: activeGalaxiesGalaxyGamma rays: galaxiesInterferometryLuminanceGalaxies: jetsSpace and Planetary ScienceAstronomiaComputingMethodologies_DOCUMENTANDTEXTPROCESSINGAstrophysics - High Energy Astrophysical PhenomenaAstrophysics - Cosmology and Nongalactic AstrophysicsFermi Gamma-ray Space TelescopeAstronomy & Astrophysics
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TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources

2018

TANAMI is a multiwavelength program monitoring active galactic nuclei (AGN) south of -30deg declination including high-resolution Very Long Baseline Interferometry (VLBI) imaging, radio, optical/UV, X-ray and gamma-ray studies. We have previously published first-epoch 8.4GHz VLBI images of the parsec-scale structure of the initial sample. In this paper, we present images of 39 additional sources. The full sample comprises most of the radio- and gamma-ray brightest AGN in the southern quarter of the sky, overlapping with the region from which high-energy (>100TeV) neutrino events have been found. We characterize the parsec-scale radio properties of the jets and compare with the quasi-simu…

PhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Active galactic nucleus010308 nuclear & particles physicsAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstronomy and AstrophysicsContext (language use)AstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesRadio telescopeNeutrino detector13. Climate actionSpace and Planetary Science0103 physical sciencesVery-long-baseline interferometryNeutrinoBlazarAstrophysics - High Energy Astrophysical Phenomena010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsFermi Gamma-ray Space Telescope
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