Luis Anchordoqui
(City University of New York)
04/05/2015, 15:30
Neutrino Astrophysics
Cosmic neutrinos with energies near 10^9 GeV and above are detectable with the Surface Detector array of the Pierre Auger Observatory. We report here on searches through Auger data from 1 January 2004 until 20 June 2013. No neutrino candidates were found, yielding a limit to the diffuse flux of ultra-high energy neutrinos that challenges the Waxman-Bahcall benchmark predictions.
Aongus Ó Murchadha
(o=ulb,ou=Institutions,dc=icecube,dc=wisc,dc=edu)
04/05/2015, 15:50
Neutrino Astrophysics
The Askaryan Radio Array (ARA) is an ultra-high energy (>100 PeV) cosmic neutrino detector which is in phased construction near the South Pole. ARA searches for radio Cherenkov-like emission from particle cascades induced by neutrino interactions in the ice using radio frequency antennas (~150-800MHz) deployed at a design depth of 200m in the Antarctic ice. A prototype ARA Testbed station was...
Mr
Sebastian Schoenen
(o=rwth,ou=Institutions,dc=icecube,dc=wisc,dc=edu)
04/05/2015, 16:10
Neutrino Astrophysics
The IceCube Collaboration measured an all-flavor, high-energy astrophysical neutrino flux. In order to identify the sources of this flux, high-energy muon neutrinos are ideal messenger particles because of their excellent angular resolution. However, the first step is to confirm the observed flux in the muon neutrino channel using IceCube data from 2009 through 2014. The main background for...
Jan Auffenberg
(o=uwmad,ou=Institutions,dc=icecube,dc=wisc,dc=edu)
04/05/2015, 16:30
Neutrino Astrophysics
ceCube is the world’s largest high-energy neutrino observatory, built at the geographic South Pole. For neutrino astronomy, a large background-free sample of well-reconstructed astrophysical neutrinos is essential. The main background for this signal are muons and neutrinos which are produced in cosmic-ray air showers in the Earth's atmosphere. The coincident detection of these air showers by...
Keith Bechtol
(KICP, University of Chicago)
05/05/2015, 14:00
Neutrino Astrophysics
The goals of the proposed Greenland Neutrino Observatory (GNO) are to measure the flux of ultra-high energy neutrinos and use this particle beam for tests of fundamental physics at energy scales that cannot be easily achieved on the Earth. The GNO concept exploits the Askaryan effect and the radio-transparency of glacial ice, which together enable hundred-cubic-kilometer volumes of ice to be...
Aongus O'Murchadha
(ULB/IIHE)
,
Krijn de Vries
(VUB/IIHE)
05/05/2015, 14:20
Neutrino Astrophysics
Recently IceCube for the first time in history discovered high-energy cosmic neutrinos with energies up to several PeV, where at higher energies IceCube runs out of statistics. At even higher energies in the EeV region, even though no detection has been claimed so-far, the Askaryan radio detectors start to become sensitive. We discuss the radar detection technique as a new method to detect a...
Sheldon Campbell
(The Ohio State University)
05/05/2015, 14:40
Neutrino Astrophysics
The angular distribution of neutrino events provides constraints on the sources. One specific observable is the angular power spectrum. This presentation outlines new formal results that clarify the path toward measuring angular power spectra of cosmic neutrinos. We'll discuss the source information that such measurements would reveal.
Dr
Walter Winter
(DESY)
05/05/2015, 15:00
Neutrino Astrophysics
We discuss quantitative benchmarks from theoretical models for the optimization of the next generation volume upgrade of IceCube. Examples include the perspectives for flavor identification, the searches for GRBs, and the potential to use the Glashow resonance to discriminate pp from pgamma interactions.
Prof.
Soebur Razzaque
(University of Johannesburg)
05/05/2015, 16:00
Neutrino Astrophysics
IceCube Neutrino Observatory has recently detected over 30 very high-energy neutrino events which are most likely of cosmic origin. Due to poor angular resolution of cascade-type events, which dominate the event list, identification of astrophysical source(s) as origin of these neutrino events is proving to be difficult. I will present a scenario where the detected cosmic neutrinos...
Ke Fang
(University of Chicago)
05/05/2015, 16:20
Neutrino Astrophysics
The electromagnetic wind of a fast-spinning pulsar provides favorable sites for cosmic ray acceleration from PeV to ultrahigh energies. We show that high-energy neutrinos are guaranteed to be produced in this system, when the accelerated particles interact with the dense baryons of the supernova ejecta. We study the light curves and energy spectrum of the neutrinos using both numerical and...
Mr
Luiz da Silva
(University of Wisconsin - Milwaukee)
05/05/2015, 16:40
Neutrino Astrophysics
Motivated by recent IceCube observations we re-examine the idea that microquasars are high energy neutrino emitters. By stretching to the maximum the parameters of the Fermi engine we show that the nearby high-mass X-ray binary LS 5039 could accelerate protons up to above about 20 PeV. These highly relativistic protons could subsequently interact with the plasma producing neutrinos up to the...
Tova Yoast-Hull
(University of Wisconsin-Madison)
05/05/2015, 17:00
Neutrino Astrophysics
We discuss the production of high energy neutrinos and gamma-rays in intensely star-forming galaxies. With our semi-analytic physical model of cosmic ray interactions, we analyze the radio and gamma-ray properties of nearby starburst galaxies using simplified astrophysical assumptions. Key physical processes in the models include pion production & decay, inverse Compton scattering,...
