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Galactic and extragalactic universe in the era of new-generation radio (SKA and pathfinders) and Optical/IR facilities

14-21 mars 2021
Indian Institute of Astrophysics - Bangalore (Inde)

This conference aims to address the synergies between new-generation radio/optical and IR facilities and advancement expected in the understanding of a wide variety of objects from galactic compact stars up to the most distant galaxies and large scale structures in the extragalactic sky. The upcoming Maunakea Spectroscopic Explorer (MSE) is a planned 11.25m optical and near-IR telescope with a large (1.5 sq.deg) field of view, which is dedicated to multi-object spectroscopy with spectral resolution up to 40000. MSE is an essential follow-up spectroscopy instrument to current and next generations of multiwavelength imaging surveys in optical/IR/radio domain (for e.g. MUSE, BLUE-MUSE, LSST, GAIA, Euclid, WFIRST, SKA) and designed to complement and go beyond the science goals of other planned spectroscopic capabilities like 4MOST, WEAVE, etc. SKA is the world's largest radio telescope of next-generation and has the capability of detecting galactic emission from supernovae, supernova remnants, transients and neutron stars, globular clusters, AGNs, galaxy clusters and groups, distant galaxies via synchrotron radiation into the epoch of reionization and tracing the neutral hydrogen content of galaxies up to z ~ 2. It will also discover many new faint unidentified galaxies whose optical spectroscopy will be crucial to maximizing the scientific output. While photometric redshifts provide reasonable precision (i.e. quantification of the galaxy environment, or the measurement of ages and metallicity, etc), the discrimination of AGN from star-forming regions requires optical emission-line diagnostics. Thus combined optical (spectroscopy and imaging) and radio surveys are essential in our understanding of the evolution of galactic sources to galaxy formation, cosmology, and star-forming galaxies (up to z > 1). MSE also will play a key role in the study of cosmo-chemistry by chemical tagging of stars and the study of abundances in stars and the associated nucleosynthesis. MSE and SKA both provide measurements of galaxy redshifts catalogs (e.g., luminous red galaxies from MSE and lower mass, gas-rich galaxies detected in HI with the SKA) that can be used to investigate the galaxy formation and evolution in different environments. Existing low-frequency SKA-pathfinders provide large surveys that can shed light on older emission associated with giant radio galaxies and clusters. Such surveys can reveal the evolution of the intergalactic and circum-galactic medium around galaxies. We can also study how AGN affect their environments through feedback processes using both optical and radio surveys. This workshop aims to address these science goals with the expertise available within France, India, and International collaboration. Existing low-frequency SKA pathfinders (LOFAR, ASKAP, u-GMRT) and IR/optical facilities (MUSE, BLUE-MUSE, HST, ALMA, IRAM) are providing large survey data with spectral, morphological and redshifts catalogs, that can be used to investigate the above-mentioned science goals and set-up the science case and users community for the future generation facilities like the MSE, TMT and SKA.
Discipline scientifique : Planète et Univers - Astrophysique

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