IPA 2017

Session

Cosmic Rays

9 May 2017, 14:30

Forum (Discovery Building)

10. Cosmic Ray Streaming in Galaxy Clusters

Joshua Wiener (UW Madison)

09/05/2017, 14:30

Cosmic Rays - Convenor: Andreas Haungs, KIT

The origin of diffuse radio emission in galaxy clusters remains an open question in astrophysics. This emission indicates the presence of cluster-wide magnetic fields and high energy cosmic ray (CR) electrons. I will discuss how the properties of the observed radio emission in clusters are shaped by different CR transport processes, namely CR streaming. I present simple numerical simulations...

4. Comprehensive explanation of ultrahigh energy cosmic ray "anomalies'': Quark matter formation by heavy nuclear primaries

Luis Anchordoqui (CUNY)

09/05/2017, 14:48

Cosmic Rays - Convenor: Andreas Haungs, KIT

The Pierre Auger Collaboration has reported an excess in the number of muons of a few tens of percent over expectations computed using extrapolation of hadronic interaction models tuned to accommodate LHC data, I'll present an explanation for the muon excess assuming the formation of a deconfined quark matter (fireball) state in central collisions of ultrarelativistic cosmic rays with air...

18. Modeling Cosmic Ray Acceleration by Galactic Wind Termination Shocks

Mr Chad Bustard (University of Wisconsin - Madison)

09/05/2017, 15:06

Cosmic Rays - Convenor: Andreas Haungs, KIT

Diffusive shock acceleration (DSA) at supernova remnant (SNR) shock fronts is thought to accelerate galactic cosmic rays (CRs) to energies below the knee, while an extragalactic origin is presumed for CRs with energies beyond the ankle. CRs with energies between 3 × 1015 and 1018 eV, which we dub the "shin," have an unknown origin. It has been proposed that DSA at galactic wind termination...

16. Nearby Pulsars and the Cosmic-Ray Positron Excess

Prof. Dan Hooper (Fermilab/University of Chicago)

09/05/2017, 15:24

Cosmic Rays - Convenor: Andreas Haungs, KIT

Recent measurements of the Geminga and B0656+14 pulsars by the gamma-ray telescope HAWC (along with earlier measurements by Milagro) indicate that these objects generate significant fluxes of very high-energy electrons. From the measured gamma-ray intensity and spectrum of these pulsars, one can calculate and constrain their expected contributions to the local cosmic-ray positron spectrum....

50. Feasibility of an Air Cherenkov Array as an Atmospheric Neutrino Veto for IceCube

Prof. Tyce DeYoung (Michigan State University)

09/05/2017, 15:42

Cosmic Rays - Convenor: Andreas Haungs, KIT

A primary challenge in neutrino astronomy is to distinguish neutrinos produced by astrophysical sources from muons and neutrinos produced in our atmosphere. Atmospheric neutrinos can be rejected if traces of their parent air showers are detected, such as penetrating muons observed by the outermost sensors in a neutrino telescope. Alternatively, air showers could be detected at the surface,...

59. A Search for Cosmic-ray Proton Anisotropies with the Fermi Large Area Telescope

Matthew Meehan (UW: Madison)

09/05/2017, 16:30

Cosmic Rays - Convenor: Andreas Haungs, KIT

In eight years of operation, the Fermi Large Area Telescope (LAT) has detected a large sample of cosmic-ray protons. The LAT's wide field of view and full-sky coverage make it an excellent instrument for studying anisotropies in the arrival directions of protons at all angular scales. These capabilities enable the LAT to make a full-sky 2D measurement of cosmic-ray proton anisotropy...

41. Compact imaging air Cherenkov telescopes as an additional component for large astro particle detectors like IceCube and HAWC

Jan Auffenberg (o=rwth,ou=Institutions,dc=icecube,dc=wisc,dc=edu)

09/05/2017, 16:48

Cosmic Rays - Convenor: Andreas Haungs, KIT

Imaging air Cherenkov telescopes (IACTs) are detecting the Cherenkov light of gamma-ray and cosmic-ray induced showers in the atmosphere. This light may add valuable information to large volume cosmic ray and gamma ray detectors like HAWC or IceCube-Gen2. For IceCube IACTs could work as an efficient veto for atmospheric neutrinos in the Southern Hemisphere and could also be used in combination...

9. KASCADE-Grande: Composition studies in the view of the post-LHC hadronic interaction models

Dr Andreas Haungs (KIT)

09/05/2017, 17:06

Cosmic Rays - Convenor: Andreas Haungs, KIT

The KASCADE-Grande experiment has significantly contributed to the current knowledge about the energy spectrum and composition of cosmic rays for energies between the knee and the ankle. Meanwhile, post-LHC versions of the hadronic interaction models are available and used to interpret the entire data set of KASCADE-Grande. In addition, a new, combined analysis of both arrays, KASCADE and...

55. Telescope Array Experiment

Dr Dmitri Ivanov (University of Utah)

09/05/2017, 17:24

Cosmic Rays - Convenor: Andreas Haungs, KIT

Telescope Array (TA) is the largest cosmic ray detector in the Norther hemisphere, which measures primary particles in 4 PeV to 100 EeV range. TA is a hybrid detector. The main TA detector consists of 507 plastic scintillation counters on a 1.2km square grid, overlooked by 3 fluorescence detector stations. By May 2017, TA will have collected 9 years of data above 1 EeV. Results of this...

49. Coherent transition radiation at radio frequencies from the electron beam sudden appearance

Krijn de Vries (VUB)

09/05/2017, 17:42

Cosmic Rays - Convenor: Andreas Haungs, KIT

We report on the detection of coherent transition radiation from the electron beam sudden appearance. The Telescope Array Linear Accelerator (TA-LINAC) is constructed to calibrate the TA fluorescence detectors by directing a high-energy electron beam in to the air. This makes the TA-LINAC the perfect device to test future detection techniques, such as the radio detection method, to probe...