We plan to fill in one or more postdoctoral level positions related to the Looking at Infrared Background Radiation Anisotropies with Euclid (LIBRAE) investigation. LIBRAE is one of 3 US- based NASA science projects to run on ESA‘s (with contribution from NASA) upcoming dark energy Euclid mission which will also measure source-subtracted cosmic infrared background (CIB) fluctuations and determine the epochs of the populations producing these fluctuations. In conjunction with X-ray and microwave data, LIBRAE will probe the contribution of early black holes, and the condition of intergalactic gas at these epochs. See LIBRAE’s science description at https://www.euclid.caltech.edu/page/KashlinskyTeam. We are seeking motivated junior scientists to participate in the development of this program, both pre- and post-Euclid launch, currently anticipated in 2023 for a 6-yr mission. Successful candidates should be qualified and interested to participate in 1) preparation of accurate maps from Euclid data for probing the source-subtracted CIB anisotropies, 2) reconstructing contributions from known galaxy populations to the CIB signal, 3) further theoretical development of contributions from early populations, such as Population 3, direct-collapse black holes, or primordial black holes making up dark matter. At present, preference will be given to 1) and 2), but strong candidates

interested to work on 3) will be welcome. Positions will be initially for 2-year duration starting at an agreed date in late 2023, with a possibility of extension subject to Euclid’s launch plans and LIBRAE’s budgetary constraints. Successful candidates will work at NASA’s Goddard Space Flight Center’s Observational Cosmology Lab subject to NASA’s visa limitations. For more details contact A. Kashlinsky (alexander.kashlinsky@nasa.gov) and/or send your resume, statement of research interests and three letters of recommendation. Applications will be considered starting immediately and the positions will remain open until filled by suitable candidates.