25–27 Sept 2019
HU Berlin
Europe/Berlin timezone

Neutrino Target of Opportunity program for the Cherenkov Telescope Array

Not scheduled
20m
1.101 (HU Berlin)

1.101

HU Berlin

Dorotheenstraße 24 10117 Berlin Germany
Poster

Speaker

Konstancja Satalecka (DESY)

Description

The measurement of an astrophysical flux of high-energy neutrinos by IceCube is an important step towards finding the long-sought sources of cosmic rays. Nevertheless, the long exposure neutrino sky map shows no significant indication of point sources so far. This may point to a large population of faint, steady sources or flaring objects as origins of this flux. The most compelling evidence for a neutrino point source so far is the recent observation of the flaring gamma-ray blazar TXS 0506+056 in coincidence with a high-energy neutrino from IceCube. This is a result of a Neutrino Target of Opportunity (NToO) program in which all currently operating Imaging Atmospheric Cherenkov Telescopes (IACTs) take part. The case for TXS 0506+056 being a neutrino source was made stronger by evidence of a 5-month long neutrino flare in 2014-2015. Here we investigate the chances of a detection of a gamma-ray counterpart to a neutrino source with CTA, as a result of a follow-up observation of a neutrino alert. We use the FIRESONG software to simulate different neutrino sources populations, which could be responsible for the diffuse flux of astrophysical neutrinos as measured by IceCube. We scan over parameters that can be used to describe the populations such as density (density rate) for steady (flaring) objects. Several CTA array layouts and instrument response functions are tested in order to derive optimal follow-up strategies and the potential science reach of the NToO program for CTA. We find that following neutrino alerts by IceCube, CTA has a low per alert probability of detecting a matching steady source. However, using a model by Halzen et al. (2018), for neutrino flares similar to that of 2014-2015, we find that CTA will detect a counterpart in as many as one third of the alerts.

Primary author

Co-authors

Alberto Rosales de Leon (Centre for Advanced Instrumentation (CfAI), Department of Physics, University of Durham, Durham, UK) Dr Anthony Brown (University of Durham) Chun Fai Tung (Center for Relativistic Astrophysics and School of Physics. Georgia Institute of Technology. Atlanta, GA 30332, USA) Glauch Theo (Institute for Advanced Studies, Technical University of Munich, D-85748 Garching, Germany) Igancio Taboada (Center for Relativistic Astrophysics and School of Physics. Georgia Institute of Technology. Atlanta, GA 30332, USA) Olga Sergijenko (Astronomical Observatory, Taras Shevchenko National University of Kyiv, 04053 Kyiv Ukraine) Rene Reimann (III. Physikalisches Institut, RWTH Aachen University, D-52056 Aachen, Germany)

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