General information
Offer title : Post-doctorat sur les galaxies à grand redshift avec le JWST (M/F) (H/F)
Reference : UMR7095-HAKATE-002
Number of position : 1
Workplace : PARIS 14
Date of publication : 27 February 2025
Type of Contract : Researcher in FTC
Contract Period : 36 months
Expected date of employment : 1 October 2025
Proportion of work : Full Time
Remuneration : Postdoctoral position on the contribution of galaxies to reionisation (M/F)
Desired level of education : Doctorate
Experience required : Indifferent
Section(s) CN : 17 - Solar system and distant universe
Missions
The AIM and IAP astrophysics laboratories announce two postdoctoral positions on star-forming galaxies in the framework of the French-Swiss collaborative project "speXion" co-funded by the ANR and SNSF.
The overall goal of speXion is to perform a coherent study of extremely metal-deficient galaxies (XMDs) in order to understand the radiation field dominating these galaxies up to X-rays, to characterize the nature, influence of energetic sources and the associated feedback processes, and to understand the contribution of XMDs to cosmic reionization. The collaboration will use multi-wavelength observations from JWST, HST, XMM, Chandra, VLA, and other facilities, as well as state-of-the-art spectral modeling tools.
The post-doctoral positions associated with the speXion collaboration concern:
- ANR/AIM post-doctoral project (coordinated by Dr. V. Lebouteiller): design a method to infer the intrinsic EUV-to-X-ray spectrum of XMDs from ISM signatures in the UV-optical-IR domain.
- ANR/IAP post-doctoral project (coordinated by Dr. H. Atek): confront spectral model predictions with a set of LyC observations to establish a robust method able to predict the escape fraction of ionizing photons in star-forming galaxies and their contribution to cosmic reionization.
- SNSF/Geneva post-doctoral project (coordinated by Prof. Daniel Schaerer; see https://aas.org/jobregister/ad/8b56239f): construct a multi-wavelength reference sample at low- and intermediate redshift, analyze and interpret interstellar medium signatures of these galaxies through empirical diagnostics and intricate models.
Activities
To confront spectral model predictions with a set of LyC observations to establish a robust method able to predict the escape fraction of ionizing photons in star-forming galaxies and their contribution to cosmic reionization.
Skills
The candidate should hold a PhD in the field of astrophysics. They are expected to have experience in extragalactic astronomy, and to be familiar with observations (analysis, reductions, ..etc), and have general knowledge of probabilistic methods
Work Context
The Paris institute for astrophysics (IAP) is a vibrant research institute affiliated to CNRS and Sorbonne University. Located in the heart of Paris, it benefits from a wide exposure, hosts many international collaborators, postdocs and graduate students. A wide array of research areas and methods are explored at IAP, including extragalactic astrophysics, cosmology, numerical simulations, and exoplanets. Its center location also offers the opportunity to interact with multiple research institutes in the Paris area (Paris observatory, ENS, CEA).
Constraints and risks
The postdoc is expected to start in October 2025
Additional Information
Qualified candidates are encouraged to send their application in a *single pdf* file to hakim.atek@iap.fr: motivation letter; CV including publications; a 3-page description of research experience and interests, and contact information of 2 to 3 references.