2 sujets IRFU

Dernière mise à jour : 08-09-2021


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• Astroparticles

 

High-energy multi-messenger astrophysics with H.E.S.S. and CTA

SL-DRF-21-0237

Research field : Astroparticles
Location :

Service de Physique des Particules (DPHP)

Groupe Astroparticules (GAP)

Saclay

Contact :

Fabian Schussler

Starting date : 01-10-2021

Contact :

Fabian Schussler
CEA - DRF/IRFU/DPHP/HESS 2

+33169083020

Thesis supervisor :

Fabian Schussler
CEA - DRF/IRFU/DPHP/HESS 2

+33169083020

Personal web page : http://irfu.cea.fr/Pisp/fabian.schussler/index.html

Laboratory link : http://irfu.cea.fr/Phocea/Vie_des_labos/Ast/ast_technique.php?id_ast=3709

Very recently a fundamentally new domain of astronomy and astrophysics has shown its first results: multi-messenger and real-time astrophysics. The simultaneous detection of various new astrophysical messengers (gravitational waves, high-energy gamma rays and high-energy neutrinos) and the exchange and combination of data from very different observatories allows to open new windows and provides unprecedented insights into the most violent phenomena ever observed.

New and significant conclusions can be obtained by combining these new messengers. Joint analyses of archival observations in different wavelengths have brought enormous insights in the past and, as this technique provides an assured and certain scientific return, it will also be used in the proposed thesis project. At the same time it has becomes clear that another important step does greatly enhance the sensitivity of multi-messenger searches: the need to gain full access to the wealth of information provided by analyzing and combining the data in real-time. The proposed thesis project will allow opening this new window to the high-energy universe: real-time multi-messenger astronomy at very high energies. The combination of the various particles and radiations in a truly multi-messenger online alert system will resolve several challenges faced in high-energy astrophysics and especially allow detecting and studying violent transient phenomena that are supposed to be at the origin of high-energy cosmic rays. The project will introduce the time domain to high-energy astrophysics and has the potential to cause a paradigm shift in how observations and data analyses are performed.

The core of the proposed project will be H.E.S.S., currently the world’s most sensitive gamma-ray instrument, and CTA, the next generation, global high-energy gamma-ray observatory. We’ll combine their data with events recorded by IceCube, the world’s largest neutrino telescope and the advanced Virgo and Ligo gravitational wave interferometers. The detection of a transient high-energy gamma-ray source in coincidence with gravitational waves or high-energy neutrinos will provide the long sought evidence for their common origin and may resolve the century old quest for the origin of high-energy cosmic rays.

We’ll also collaborate with the world’s most sensitive radio observatories (e.g. the SKA precursors MeerKAT and ASKAP) to search for counterparts to Fast Radio Bursts and in general study a large variety of messengers like Gamma-Ray Bursts or flares from active galactic nuclei. By scanning the data acquired with high-energy gamma-ray observatories in real-time, it will also possible to send alerts to the wider astronomical community to ensure simultaneous observations at other wavelengths.

Natural language processing in time domain astrophysics

SL-DRF-21-0773

Research field : Astroparticles
Location :

Service de Physique des Particules (DPHP)

Groupe HESS 2

Saclay

Contact :

Fabian Schussler

Starting date : 01-10-2021

Contact :

Fabian Schussler
CEA - DRF/IRFU/DPHP/HESS 2

+33169083020

Thesis supervisor :

Fabian Schussler
CEA - DRF/IRFU/DPHP/HESS 2

+33169083020

Personal web page : http://irfu.cea.fr/Pisp/fabian.schussler/index.html

Laboratory link : http://irfu.cea.fr/Phocea/Vie_des_labos/Ast/ast_technique.php?id_ast=3709

More : https://www.limsi.fr/fr/recherche/iles

Time domain and high-energy astrophysics is dealing with the most violent phenomena in the universe. Rapid exchange of information is crucial to detect these transient, i.e. short-lived, events with multiple observatories covering the full multi-wavelength domain and all cosmic messengers. Victim of its own success, the current way of manual reading, analyzing and classifying information shared by astrophysicists in Astronomers Telegrams or circulars within the Gamma-ray Coordinates Network is approaching saturation. One of the most promising novel approaches is to build on the recent progress in artificial intelligence and especially natural language processing (NLP) and feature extraction.

This thesis will bring together leading experts in two exiting domains: Artificial Intelligence and time domain, multi-messenger astrophysics. The project will be part of the UDOPIA program of the Paris-Saclay university and benefit from a rich ecosystem in both astrophysics and AI as well strong ties with leading industry partners.

 

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