4 sujets /DAp/LEPCHE

Dernière mise à jour : 19-08-2022


 

Origin and nature of high-energy emission from microquasars: long-term behaviour and real-time monitoring with the INTEGRAL and SVOM observatories

SL-DRF-22-0140

Research field : Astrophysics
Location :

Direction d’Astrophysique (DAP)

Laboratoire d’Etudes des Phénomènes Cosmiques de Haute Energie (LEPCHE)

Saclay

Contact :

Jérôme RODRIGUEZ

Starting date : 01-10-2022

Contact :

Jérôme RODRIGUEZ
CEA - DRF/IRFU/DAp/LEPCHE

01 69 08 98 08

Thesis supervisor :

Jérôme RODRIGUEZ
CEA - DRF/IRFU/DAp/LEPCHE

01 69 08 98 08

Laboratory link : https://irfu.cea.fr/dap/Phocea/Vie_des_labos/Ast/ast_groupe.php?id_groupe=974

Intergalactic magnetic field and gamma ray bursts with CTA

SL-DRF-22-0462

Research field : Astrophysics
Location :

Direction d’Astrophysique (DAP)

Laboratoire d’Etudes des Phénomènes Cosmiques de Haute Energie (LEPCHE)

Saclay

Contact :

Renaud Belmont

Thierry STOLARCZYK

Starting date : 01-09-2022

Contact :

Renaud Belmont
Université de Paris (Paris 7) - DRF/IRFU/DAP/LEPCHE


Thesis supervisor :

Thierry STOLARCZYK
CEA - DRF/IRFU/DAp/LEPCHE

+33 1 69 08 78 12

Personal web page : http://irfu.cea.fr/Pisp/thierry.stolarczyk/

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

More : http://www.cta-observatory.org/

The intergalactic magnetic field pervading the cosmic voids is suspected to be a relic field originating from the very first epoch of the cosmic history. The goal of this PhD is to look for signatures of this field in the high-energy data of gamma-ray bursts, and to predict the ability of the future CTA observatory to constrain its properties. This work combines both theoretical modelling and analysis of simulated CTA data.
Study of accretion and ejection processes in variable black hole systems with SVOM

SL-DRF-22-0487

Research field : Astrophysics
Location :

Direction d’Astrophysique (DAP)

Laboratoire d’Etudes des Phénomènes Cosmiques de Haute Energie (LEPCHE)

Saclay

Contact :

Andrea GOLDWURM

Starting date : 01-10-2022

Contact :

Andrea GOLDWURM
CEA - DRF/IRFU/DAp/LEPCHE

0169088669

Thesis supervisor :

Andrea GOLDWURM
CEA - DRF/IRFU/DAp/LEPCHE

0169088669

Laboratory link : https://irfu.cea.fr/dap/Phocea/Vie_des_labos/Ast/ast_groupe.php?id_groupe=974

More : https://apc.u-paris.fr/APC_CS/fr

We propose to carry out a study of accretion and ejection processes in black hole systems which are highly variable or transient emitters of high energy photons, by using the multi-wavelength data of the SVOM space mission and the relevant multi-messenger data that will be available to our laboratory.

The super-massive black holes located in galaxy centers, in particular those that generate the luminous Active Galactic Nuclei (AGN), or the stellar-mass black holes that evolve in bright X-ray close binary systems (XRB), show a high-energy emission (in X and gamma-rays) which is always variable and often transient. They will be priority targets for the Chinese-French space mission SVOM dedicated to the variable high-energy sky and that will be launched early 2023. SVOM will provide a large set of data from optical to gamma-ray wavelengths of high energy sources particularly those located at high galactic latitudes during the observations of the General Program (GP) of the mission. Galactic sources will be pointed instead mainly during Target of Opportunity (ToO) observations triggered by the appearance in the sky of a new transient source, for example of a BH X-ray Nova. APC has important responsibilities in these programs and it will be at the center of the scientific projects that will exploit these data. The thesis will focus on those programs dedicated to analysis and astrophysical interpretation of the mission data on BH systems, and will profit of, and contribute to, the large expertise in X/gamma-ray data analysis and in astrophysics of compact objects of the team. Particular attention will be dedicated to the multi-messenger astronomy context of the BH observations, with the search for possible neutrino, cosmic ray and gravitational wave emissions associated to the studied variable high-energy electromagnetic events.
Mapping physical parameters in supernova remnants assisted by machine learning

SL-DRF-22-0628

Research field : Astrophysics
Location :

Direction d’Astrophysique (DAP)

Laboratoire d’Etudes des Phénomènes Cosmiques de Haute Energie (LEPCHE)

Saclay

Contact :

Fabio Acero

Starting date : 01-10-2022

Contact :

Fabio Acero
CEA - DRF/IRFU/DAP/LEPCHE

0169084705

Thesis supervisor :

Fabio Acero
CEA - DRF/IRFU/DAP/LEPCHE

0169084705

Spectro-imaging telescopes in X-rays allow to measure the position, Energy and time of arrival of every detected photon. Based on this photon list, one can construct data cube (x, y, energy) where a Spectrum can be obtained for each pixel. Despite the major progress from an instrumental point of view, the analysis methods in the X-ray community have stalled in the last decade and current methods will not be able to extract the full scientific potential of upcoming missions.



This project proposes to develop new analysis methods using advanced signal processing techniques based on the concept of sparsity and assisted by machine learning to map the physical parameters (temperature, metalicity, Redshift, etc) across extended sources such as supernova remnants or galaxy clusters.



Developing such methods will be key to tackle the issues of analyzing the very high spectral resolution data from next generation X-ray telescopes such as XRISM (2023) and Athena X-IFU (2034).

• Astrophysics

 

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