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Constraints on particles and fields from full Stokes observations of AGN
<p>Combined polarization imaging of radio
jets from Active Galactic Nuclei (AGN) in circular and linear
polarization, also known as full Stokes imaging, has the potential to
constrain both the magnetic field structure ...
The high brightness temperature of B0529+483 revealed by RadioAstron and implications for interstellar scattering
<p>The high brightness temperatures, Tb 1013 K, detected in several active galactic nuclei by<br />RadioAstron space VLBI observations challenge theoretical limits. Refractive scattering by<br />the interstellar medium ...
The lowest-metallicity type II supernova from the highest-mass red supergiant progenitor
Red supergiants have been confirmed as the progenitor stars of the majority of hydrogen-rich type II supernovae(1). However, while such stars are observed with masses > 25 M-circle dot (ref. (2)), detections of > 18 M-circle ...
Stochastic Modeling of Multiwavelength Variability of the Classical BL Lac Object OJ287 on Timescales Ranging from Decades to Hours
We present the results of our power spectral density analysis for the BL Lac object OJ 287, utilizing the Fermi-LAT survey at high-energy.-rays, Swift-XRT in X-rays, several ground-based telescopes and the Kepler satellite ...
The broad-band properties of the intermediate synchrotron peaked BL Lac S2 0109+22 from radio to VHE gamma-rays
The Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescopes observed S2 0109+22 in 2015 July during its flaring activity in high-energy gamma-rays observed by Fermi-Large Area Telescope. We analyse the MAGIC data ...
A dust-enshrouded tidal disruption event with a resolved radio jet in a galaxy merger
Tidal disruption events (TDEs) are transient flares produced when a star is ripped apart by the gravitational field of a supermassive black hole (SMBH). We have observed a transient source in the western nucleus of the ...
SNhunt151: an explosive event inside a dense cocoon
SNhunt151 was initially classified as a supernova (SN) impostor (nonterminal outburst of a massive star). It exhibited a slow increase in luminosity, lasting about 450 d, followed by a major brightening that reaches M-V ...
Multiwavelength Observations of the Blazar BL Lacertae: A New Fast TeV Gamma-Ray Flare
Combined with measurements made by very-long-baseline interferometry, the observations of fast TeV gamma-ray flares probe the structure and emission mechanism of blazar jets. However, only a handful of such flares have ...
Multi-wavelength characterization of the blazar S5 0716+714 during an unprecedented outburst phase
Context. The BL Lac object S5 0716+714, a highly variable blazar, underwent an impressive outburst in January 2015 (Phase A), followed by minor activity in February (Phase B). The MAGIC observations were triggered by the ...
Long-term optical monitoring of TeV emitting blazars I. Data analysis
We present ten years of R-band monitoring data of 31 northern blazars which were either detected at very high-energy (VHE) gamma rays or listed as potential VHE gamma-ray emitters. The data comprise 11 820 photometric data ...