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46 papers · 2 filters
Searches for Relativistic Magnetic Monopoles in IceCube
IceCube Collaboration, M. G. Aartsen, K. Abraham +306
Various extensions of the Standard Model motivate the existence of stable magnetic monopoles that could have been created during an early high-energy epoch of the Universe. These p…
Gamma rays from the quasar PKS 1441+25: story of an escape
A. U. Abeysekara, S. Archambault, A. Archer +103
Outbursts from gamma-ray quasars provide insights on the relativistic jets of active galactic nuclei and constraints on the diffuse radiation fields that fill the Universe. The det…
Abundance Anomalies In Tidal Disruption Events
C. S. Kochanek
The ~10% of tidal disruption events (TDEs) due to stars more massive than the Sun should show abundance anomalies due to stellar evolution in helium, carbon and nitrogen, but not o…
Cosmogenic Neutrinos Challenge the Cosmic Ray Proton Dip Model
Jonas Heinze, Denise Boncioli, Mauricio Bustamante +1
The origin and composition of ultra-high-energy cosmic rays (UHECRs) remain a mystery. The proton dip model describes their spectral shape in the energy range above GeV by p…
Multiwavelength survey of a sample of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies
L. Foschini, M. Berton, A. Caccianiga +27
We report on a multiwavelength survey of a sample of 42 flat-spectrum radio-loud narrow-line Seyfert 1 galaxies (RLNLS1s). This is the largest known sample of this type of active g…
Almost Gone: SN~2008S and NGC~300 2008OT-1 are Fainter than their Progenitors
S. M. Adams, C. S. Kochanek, J. L. Prieto +3
We present late-time Hubble and Spitzer Space Telescope imaging of SN 2008S and NGC 300 2008OT-1, the prototypes of a common class of stellar transients whose true nature is debate…