Browsing Conference Papers by Author "Böttcher, Markus"

Now showing items 1-9 of 9

    • Calorimetric neutrino expectations from bright blazar flares 

      Kreter, Michael; Böttcher, Markus; Kadler, Matthias; Krauss, Felicia; Buson, Sara (Sissa Medialab, 2019)
      Blazar jets are extreme environments, in which relativistic proton interactions with an ultraviolet photon field could give rise to photopion production. High-confidence associations of individual high-energy neutrinos ...

    • Constraining the environment of neutrino-emitting regions in jets of FSRQs 

      Reimer, Anita; Böttcher, Markus; Buson, Sara; Miceli, Davide (Sissa Medialab, 2019)
      Recently, the gamma-ray blazar TXS 0506+056 has been proposed as the source of neutrino events detected by IceCube in 2014-15 and 2017. This has further pushed the idea of blazar jets being among those cosmic sites where ...

    • CTA 102 - Year over year receiving you 

      Zacharias, Michael; Böttcher, Markus; Jankowsky, Felix; Lenain, Jean-Philippe; Wagner, Stefan J. (Sissa Medialab, 2019)
      The FSRQ CTA 102 (z=1.032) has been tremendously active over the last few years. During its peak activity lasting several months in late 2016 and early 2017, the gamma-ray and optical fluxes rose by up to a factor 100 ...

    • GRB observations with H.E.S.S. 

      Piel, Quentin; Böttcher, Markus; Arcaro, Cornelia; Ashkar, Halim; Bissaldi, Elisabetta (Sissa Medialab, 2019)
      Fermi-LAT observations have proven that GeV γ-ray emission is a relatively common feature for many Gamma Ray Bursts (GRB). However the low effective area of space detectors implies low statistics for high-energy photons ...

    • Optical variability modelling of newly identified blazars and blazar candidates behind Magellanic clouds 

      Zywucka, Natalia; Böttcher, Markus; Tarnopolski, Mariusz; Stawarz, Lukasz; Marchenko, Volodymyr (Sissa Medialab, 2019)
      We present results of a variability study in the optical band of 44 newly identified blazar candidates behind the Magellanic Clouds. Our sample contains 27 flat spectrum radio quasars (FSRQs) and 17 BL Lacertae objects (BL ...

    • Particle-in-cell simulations of shear boundary layers in relativistic jets 

      Chand, Tej; Böttcher, Markus; Kilian, Patrick (Sissa Medialab, 2018)
      The supermassive black holes in the centres of active galaxies (AGN) eject powerful relativistic jets which propagate over kpc scales, showing no significant momentum loss. Both observational evidence as well as theoretical ...

    • Search for High-redshift Blazars with Fermi/LAT 

      Kreter, Michael; Böttcher, Markus; Kadler, Matthias; Krauss, Felicia; Buson, Sara (Sissa Medialab, 2019)
      High-redshift blazars (z ≥ 2.5) are one of the most powerful classes of γ-ray sources in the Universe. These objects possess the highest jet powers and luminosities and have black-hole masses often in excess of 109 solar ...

    • ThunderKAT: the MeerKAT large survey project for image-plane radio transients 

      Fender, Rob; Böttcher, Markus; Woudt, Patrick; Armstrong, Richard; Groot, Paul (Sissa Medialab, 2016)
      ThunderKAT is the image-plane transients programme for MeerKAT. The goal as outlined in 2010, and still today, is to find, identify and understand high-energy astrophysical processes via their radio emission (often in ...

    • Time-dependent, multi-wavelength shock acceleration models for active flares of 3C 279 

      Baring, Matthew G.; Böttcher, Markus (Sissa Medialab, 2019)
      Jets in blazars are an excellent forum for studying acceleration at relativistic shocks using the highly-variable emission seen across the electromagnetic spectrum. Our recent work on combining multi-wavelength leptonic ...