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Portail > Offres > Offre UMR8023-ANTGUS-002 - Post-doc ANR COSMHIC H/F


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Français - Anglais

Date Limite Candidature : lundi 13 décembre 2021

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General information

Reference : UMR8023-ANTGUS-002
Workplace : PARIS 05
Date of publication : Monday, November 22, 2021
Type of Contract : FTC Scientist
Contract Period : 20 months
Expected date of employment : 1 January 2022
Proportion of work : Full time
Remuneration : between 2728 and 3145 euros per month, depending on experience
Desired level of education : PhD
Experience required : Indifferent


The candidate will work in the frame of the ANR COSMHIC project (Constraining the Origin of Stellar Masses in Hierarchical Infalling Clouds, https://anr.fr/Projet-ANR-20-CE31-0009), in collaboration with the LPENS team involved in this project (two permanent researchers, one PhD student). This ANR project aims at understanding how the physical conditions in general and the dynamical processes in particular shape up the star formation at the Galactic scale. Within this project, the LPENS team is in charge of the determination of physical conditions within the regions observed by the ALMA large programme ALMA-IMF: density, velocities, magnetic fields - intensity and orientation - radiation fields, ionisation fraction. densité, vitesses, champs magnétiques - intensité et orientation, champs de rayonnement, fraction d'ionisation. To this aim, members of our team develop and/or apply sophisticated methods of interpretation on a combination of observables coming from the ALMA-IMF programme, and from past surveys (Herschel HOBYS, WISE, 2MASS,...). The candidate will take part in this work, that necessitates a deep knowledge and understanding of the observations and models that are used. The work will also be based on the development of some of these models: the Paris-Durham shock code, a radiative transfer code, PPMAP, HerBIE... Initiatives towards a thorough interpretation of the observations will also be encouraged.


- main task, maximum responsibility: production of maps of Spectral Energy Distributions of the regions observed within the ALMA-IMF programme. These maps are required to characterise the luminosity of these extreme star forming regions within our Galaxy. This luminosity can then be compared with similar values obtained in extragalactic environments, and allow to characterise the evolution of star formation through cosmic time.

- main task, maximum responsibility: determination of temperature maps for the regions observed within the frame of the ALMA-IMF large programme. These maps are crucial to measure the mass of the dense cores that are the embryos of future forming stars. This mass measurement allows to fullfil one of the requirements of the COSMHIC programme: the production of Core Mass Functions for the observed regions. These functions represent one of the essential tools to characterise star formation.

- main task, shared responsibility: determination of local physical and chemical properties by comparison of shock models combined with a radiative transfer code with observations of shocks in the regions observed by the ALMA-IMF programme. In the observed regions, interstellar shock structures are indeed ubiquitous: filaments resulting from clou-cloud collisions, protostellar jets and outflows, accretion shocks,...The aim is to use observations of emission lines from the gas in order to understand these shocks, measure the conditions of the medium in which they propagate, and quantify their energetic and chemical impacts on multiple scales.

- secondary task, shared responsibility: development and/or validation of sophisticated codes for the interpretation of observational data: Paris-Durham shock code, radiation transfer code used in combination or in standalone mode.

- secondary task, shared responsibility: reduction of observations performed in the frame of the ALMA-IMF programme or complementary programmes. The aim is to provide the community with observational datasets that can be systematically used and interpreted.

- secondary task, shared responsibility: use datasets from ALMA-IMF and the complementary programmes to perform statistical comparisons between simulations and observations used within the Interstellar medium community, in collaboration with the LPENS team that works on these questions (made of more members than the ones working directly on COSMHIC).


- In relation with observations, the candidate must be familiar with all the techniques used to obtain, perform and reduce observations in the infrared to millimeter range: single-dish and interferometric, emission lines from the gas and continuum from the dust.

- In terms of models, the candidate must possess a deep understanding of micro-physical and chemical models for the description of the interstellar medium , and have some experience in their application to interpret observational data: Paris-Durham shock code, radiative transfer code based on the Large Velocity Gradient approximation, PPMAP and HerBIE. The candidate will possibly participate to the development of some of them.

- In relation with the comparison between observations and models, the candidate will be requested to compare large grid of models with observations. Strong skills in programmation (python, fortran) will be more than welcome.

Work Context

The LPENS (Laboratoire de Physique de l'École Normale Supérieure, UMR8023) is a laboratory created on January 1st, 2019. Approximately one hundred researchers or teaching researchers work there, dispatched in six axis (Astrophysics, Biophysics, Fluides and interfaces, fondamental interactions, materials and quantum devices, statistical physics). themselves sub-structured in 19 teams. The laboratory is located in the fifth district of Paris (24, rue Lhomond).

The candidate will work within team 9, Astrophysics. 7 researchers and 2 emeritus researchers work in this team. This team also represents one of the six axis of LPENS. The research topics are the interstellar medium, cosmology and the application of statistical descriptions to both fields. The candidate will work and exchange with all researchers (permanent or not) involved in the study of the interstellar medium and in the development of statistical descriptions.

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Additional Information


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