Conference finished on 09/06/2021

Relevés photométriques grand champ II (Session 23)

    Suite au succès de l'atelier tenu lors de la SF2A 2018 et de l’avancée rapide du sujet, ce second atelier rassemblera de nouveau la communauté française impliquée sur les grands relevés photométriques grand champ optique et proche infrarouge présents et futurs pour dresser un bilan de la science et des méthodes.

    Program : Session 23 SF2A 2021, Mercredi 9 juin (14:00-18:00)
    Regular talks : 15mn, including Q&A
    Review talks  : 25mn, including Q&A

    14:00 Session starts

    14:00-14:05 Jean-Baptiste Marquette - SF2A forewords
    14:05-14:10 Jean-Charles Cuillandre for the SOC - Session introduction

    The Galaxy
    Chair: Annie Robin
    14:10-14:25 Céline Reylé - The solar neighbourhood as seen by Gaia
    14:25-14:50 Benoit Famaey (Review) - Galactic dynamics in the Gaia era
    14:50-15:05 Emma Fernández-Alvar - The unveiling of the very metal-poor thin disc tail with Gaia and the Pristine Survey
    15:05-15:20 Marc-Antoine Miville-Deschênes - Galactic cirri with MegaCam and perspectives with Euclid

    Present and upcoming large imaging projects for the French community
    Chair: Annie Robin
    15:20-15:35  Jean-Charles Cuillandre - CFIS and UNIONS (Ultraviolet Near-Infrared Optical Northern Survey)
    15:35-16:00 Yannick Mellier (Review) - The Euclid mission
    16:00-16:25 Emmanuel Gangler (Review) - The Vera C. Rubin LSST

    16:25-16:30 Pause

    Extragalactic Science

    Chair: Vanessa Hill
    16:30-16:45 Rashi Jain - Globular clusters in wide-field imaging - Complicated relation between the colors and environment
    16:45-17:00 Ariane Lançon - Extragalactic Globular Clusters in Euclid and other major surveys
    17:00-17:15 Elisabeth Sola - Annotations of LSB structures around massive galaxies: a new tool to study their mass assembly
    17:15-17:30 Vincent Picouet - Constraint on the evolution of the cosmic SFR activity up to z~2 with HSC-CLAUDS deep survey
    17:30-17:45 Amaël Ellien - Intracluster light with CFIS-LSB
    17:45-18:00 Axel Guinot - Weak Lensing analysis of the UNIONS/CFIS data, first results

    18:00 Adjourning session

    Science Organizing Committee: Stéphane Arnouts (LAM), Hervé Bouy (Univ. Bordeaux), Benoît Carry (OCA), Jean-Charles Cuillandre (CEA-DAp-AIM, porteur de l'atelier), Raphaël Gavazzi (IAP), Vanessa Hill (OCA), Rodrigo Ibata  (OAS), Yannick Mellier (IAP), Annie Robin (Obs. de Besançon), Sylvain de la Torre (LAM)

    Main objectives of the workshop: To bring together French scientists active in a truly fertile field but often segmented by the very nature of the individual projects, and to trigger a community wide reflection on the key role of large surveys in today's  science and how to ensure their success.

    Communities: The first workshop was endorsed by the PNCG although the science enabled by such surveys goes beyond galaxies&cosmology, and, as expected, we reached an audience extending to other poles (PNP, PNPS). We did not in consequence request a formal endorsement for this second edition.

    Description / Scientific context: Wide field astronomy has now moved into an all-sky regime. French scientists are particularly active in the arena of wide-field imaging, the international context of photometric surveys (deep and/or all-sky) being highly relevant for the many themes explored within the PNCG, PNPS, and PNP. The ESA Gaia mission is a brisk success while the two prominent upcoming international imaging projects, Euclid and Rubin-LSST, both cosmology driven (Stage IV dark energy measurement) will inherently produce datasets that will represent a treasure trove for scientific topics ranging from the Solar System to cosmology. This explains the large size of these scientific collaborations, with France very well positioned in the three projects listed above. There are other ambitious surveys currently in acquisition phase which focus on specific scientific aspects and, unsurprisingly, several French experts operate within these international collaborations (DES, DECaLS, HSC-SSP, etc.). Specifically a French co-led effort, critical complementary data for the Euclid space mission led to the development of tailored ground-based surveys such as the Canada-France Imaging Survey (CFHT), now within the international joint effort Ultraviolet Near-Infrared Optical Northern Survey (UNIONS) with Pan-STARRS, Subaru's WISHES, and Suburu HSC-g, to cover in the u,g,r,i,z bands the northern sky in the u,g,r,i,z bands at unprecedented depths. UNIONS which is open to anyone in the French community produces today stand-alone scientific results, particularly on galactic archeology and cosmology.


    Session 23 is part of the master conference "Semaine de l'astrophysique française 2021"

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