Now showing items 1-10 of 123
Pushing the Limits: High Redshift Fermi-LAT Blazars
(International Center for Theoretical Physics, 2016-05-05)
Energetic Particles of Cosmic Accelerators I: Galactic Accelerators
The high-energy universe has revealed that energetic particles are ubiquitous in the cosmos and play a vital role in the cultivation of cosmic environments on all scales. Energetic particles in our own galaxy, galactic ...
The Spectral Energy Distribution of Fermi Bright Blazers
(The American Astronomical Society, 2010-05-13)
e have conducted a detailed investigation of the broadband spectral properties of the γ-ray selected blazars of the Fermi LAT Bright AGN Sample (LBAS). By combining our accurately estimated Fermi γ-ray spectra with Swift, ...
VERITAS and Fermi-LAT Observations of TeV Gamma-Ray Sources Discovered by HAWC in the 2HWC Catalog
(The American Astronomical Society, 2018-10-05)
The High Altitude Water Cherenkov (HAWC) collaboration recently published their 2HWC catalog, listing 39 very high energy (VHE; >100 GeV) gamma-ray sources based on 507 days of observation. Among these, 19 sources are not ...
Milliarcsecond Structure of Microarcsecond Sources
(Proceedings of Science, 2007-06-12)
We present the key findings of an ongoing program of Very Long Baseline Interferometry (VLBI) observations of scintillating and non-scintillating flat-spectrum extragalactic radio sources whose scintillation status was ...
Intraday Radio Variability and Micro-Arcsecond Resolution
(Astronomical Society of the Pacific, 2009)
Intraday variability (IDV) of AGN at centimeter wavelengths has been shown to be predominantly due to interstellar scintillation (ISS). Recent VLBI observations have shown that IDV sources are more compact than non-IDVs ...
The Second Realization of the International Celestial Reference Frame by Very Long Baseline Interferometry
(The American Astronomical Society, 2015-07-24)
We present the second realization of the International Celestial Reference Frame (ICRF2) at radio wavelengths using nearly 30 years of Very Long Baseline Interferometry observations. ICRF2 contains precise positions of ...
Coincidence of a high-fluence blazar outburst with a PeV-energy neutrino event
The astrophysical sources of the extraterrestrial, very high-energy neutrinos detected by the IceCube collaboration remain to be identified. Gamma-ray (γ-ray) blazars have been predicted to yield a cumulative neutrino ...
The Third Catalog of Active Galactic Nuclei detected by the Fermi Large Area Telescope
(The American Astronomical Society, 2015-08-25)
The third catalog of active galactic nuclei (AGNs) detected by the Fermi-LAT (3LAC) is presented. It is based on the third Fermi-LAT catalog (3FGL) of sources detected between 100 MeV and 300 GeV with a Test Statistic ...
Multimessenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A
(American Association for the Advancement of Science, 2018-07-13)