The Canada–France Imaging Survey: First Results from the u-Band Component

Rodrigo Ibata (1) , Alan Mcconnachie (2) , Jean-Charles Cuillandre (3) , Nicholas Fantin (2) , Misha Haywood (4) , Nicolas Martin (2) , Pierre Bergeron (5) , Volker Beckmann (6) , Edouard Bernard (7) , Piercarlo Bonifacio (4) , Elisabetta Caffau (4) , Raymond Carlberg (8) , Patrick Côté (2) , Remi Cabanac (9, 10) , Scott Scott , Pierre-Alain Duc (1) , Florence Durret (11) , Benoît Famaey (1) , Sébastien Fabbro (2) , Stephen Gwyn (2) , Francois Hammer (4) , Vanessa Hill (7) , Michael J. Hudson (12) , Ariane Lançon (1) , Geraint Lewis (13) , Khyati Malhan (1) , Paola Di Matteo (4) , Henry Mccracken (11) , Simona Mei (14, 15, 16) , Yannick Mellier (11) , Julio Navarro (17) , Sandrine Pires (18) , Chris Pritchet (17) , Céline Reylé (19) , Harvey Richer (20) , Annie Robin (19) , Rubén Sánchez Jannsen (21) , Marcin Sawicki (22) , Douglas Scott (23) , Vivien Scottez (11) , Kristine Spekkens (24) , Else Starkenburg (25) , Guillaume Thomas (1) , Kim Venn (23)

1 ObAS - Observatoire astronomique de Strasbourg
2 NRC Herzberg Institute of Astrophysics
3 AIM (UMR_7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
4 GEPI - Galaxies, Etoiles, Physique, Instrumentation
5 Département de Physique, Université de Montréal, Quebec, H3C 3J7
6 IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS
7 LAGRANGE - Joseph Louis LAGRANGE
8 Department of Astronomy and Astrophysics [Universty of Toronto]
9 LATT - Laboratoire Astrophysique de Toulouse-Tarbes
10 IRAP - Institut de recherche en astrophysique et planétologie
11 IAP - Institut d'Astrophysique de Paris
12 University of Waterloo [Waterloo]
13 The University of Sydney
14 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
15 Université Paris Diderot, Sorbonne Paris Cité, Paris, France
16 JPL - Jet Propulsion Laboratory
17 UVIC - University of Victoria [Canada]
18 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
19 UTINAM - Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213)
20 University of British Columbia [Vancouver]
21 ROE - Royal Observatory Edinburgh
22 Saint Mary's University [Halifax]
23 UBC - University of British Columbia
24 Royal Military College of Canada, Department of Physics
25 AIP - Leibniz Institute for Astrophysics Potsdam

The Canada-France Imaging Survey (CFIS) will map the northern high Galactic latitude sky in the uband ("CFIS-u", 10,000 deg 2) and in the r-band ("CFIS-r", 5,000 deg 2), enabling a host of stand-alone science investigations, and providing some of the ground-based data necessary for photometric redshift determination for the Euclid mission. In this first contribution we present the u-band component of the survey, describe the observational strategy, and discuss some first highlight results, based on approximately one third of the final area. We show that the Galactic anticenter structure is distributed continuously along the line of sight, out to beyond 20 kpc, and possesses a metallicity distribution that is essentially identical to that of the outer disk sampled by APOGEE. This suggests that it is probably a buckled disk of old metal-rich stars, rather than a stream or a flare. We also discuss the future potential for CFIS-u in discovering star-forming dwarf galaxies around the Local Group, the characterization of the white dwarf and blue straggler population of the Milky Way, as well as its sensitivity to low-surface brightness structures in external galaxies.

Mots clés: Galaxy; halo -Galaxy; stellar content -surveys -galaxies; formation -Galaxy; structure -stars; white dwarfs

Domaines: Astrophysique galactique [astro-ph.GA]; Astrophysique [astro-ph]

Rodrigo Ibata, Alan Mcconnachie, Jean-Charles Cuillandre, Nicholas Fantin, Misha Haywood, et al.. The Canada–France Imaging Survey: First Results from the u-Band Component. The Astrophysical journal letters, 2017, 848 (2), pp.128. ⟨10.3847/1538-4357/aa855c⟩. ⟨hal-01714623⟩