3 juillet - 6 juillet 2018


Relevés photométriques grand champ

Programme du vendredi 6 juillet 2018, 13:30-17:30
Deux sessions (2hr + 1h30mn) entrecoupées d'une pause de 30mn

S14 Session 1, 13:30-15:30 (chair: Annie Robin)

13:30Jean-Charles CuillandreIntroduction générale
13:35Emmanuel BertinThe Dark Energy Survey: survey status and science results
13:50 Stéphane ArnoutsThe HSC-CLAUDS deep survey
14:05 Herve BouyCOSMIC DANCE: unravelling the origin of the initial mass function
14:20 Jean-Charles CuillandreThe Canada-France Imaging Survey and Euclid
14:35 Henry McCracken CALET: Processing complementary observations for Euclid
14:40 Pierre Antilogus The Large Synoptic Survey Telescope
14:55 Alessandro BoselliVESTIGE: A Virgo Environmental Survey Tracing Ionised Gas Emission
15:10 All attendees Introduction sur l’exercice de prospective INSU 2019 par Guy Perrin, suivie d'une discussion sur l'état de réalisation de grands relevés pour la communauté.
15:30 Pause café

S14 Session 2, 16:00-17:30 (chair Stéphane Arnouts)

16:00 David Valls-Gabaud MESSIER: the ultimate full-sky UV-optical photometric survey
16:15 Axel GuinotWeak lensing in CFIS, preliminary results on the W3 field
16:30 Raphael GavazziStrong lensing in CFIS and archival CFHT data
16:45 Katarzyna MalekThe impact of dust attenuation laws on the measure
of the main physical properties of galaxies
17:00 Johanna Pasquet Deep learning approach to predict photometric redshifts
of galaxies in the Sloan Digital Sky Survey DR12
17:15 Diego TuccilloDeep learning for galaxy surface brightness profiling

17:30 Fin de la session S14

Organisateurs (SOC) et contact principal:

Stéphane Arnouts (LAM)
Jean-Charles Cuillandre (CEA Saclay / Obs. de Paris) jc.cuillandre .at. cea.fr
Vanessa Hill (OCA)
Yannick Mellier (IAP)
Annie Robin (Obs. de Besancon)
Sylvain de la Torre (LAM)


L'atelier rassemblera la communauté française impliquée sur les grands relevés photométriques grand champ optique et proche infrarouge présents (Gaia, DES, Pan-STARRS, DECaLS, HSC, CFIS, etc.) et futurs (Euclid, LSST, etc.) pour dresser un bilan de la science et des méthodes.

Description / Scientific context:

Wide field astronomy has now moved into an all-sky regime. French scientists are particularly active in the burgeoning 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 successfully on-going and will hold its scientific promises, and more, while the two prominent upcoming international imaging projects, Euclid and 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 that focus on specific scientific aspects and, unsurprisingly, several French experts have found their way into these international collaborations (DES, Pan-STARRS, DECaLS, HSC, etc.). Critical complementarity for the Euclid space mission led to the development of tailored ground-based surveys such as the Canada-France Imaging Survey which will produce a stand-alone science that will stand on its own merit. Also, the various past and present wide-field imagers operated across the world create a vast archive of the sky which can be mined for specific groundbreaking science studies such as the French led COSMIC-DANCE project (origin of the IMF).


This workshop is endorsed by the PNCG although the science enabled by such surveys goes beyond galaxies&cosmology, hence we expect an audience extending to other poles (PNP, PNPS).

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 reflexion on the key role of large surveys in today's science and how to ensure their success.

e-posters pour cette session

PAILLASSA MaximeIdentifying contaminants in astronomical images using convolutional neural networkse-poster (click to see)
Ellien AmaelPresenting DAWIS : Detection Algorithm with Wavelet for Intra-cluster light Surveyse-poster (click to see)