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An Efficient Approach to Obtaining Large Numbers of Distant Supernova Host Galaxy Redshifts
Lidman C., Ruhlmann-Kleider V., Sullivan M., Myzska J., Dobbie P. et al
Publications of the Astronomical Society of Australia 30 (2012) 1 - http://hal.in2p3.fr/in2p3-00739721
Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
An Efficient Approach to Obtaining Large Numbers of Distant Supernova Host Galaxy Redshifts
C. Lidman, V. Ruhlmann-Kleider1, M. Sullivan, J. Myzska, P. Dobbie, K. Glazebrook, J. Mould, P. Astier2, C. Balland2, M. Betoule2, R. Carlberg, A. Conley, D. Fouchez3, J. Guy2, D. Hardin2, I. Hook, D. A. Howell, R. Pain2, N. Palanque-Delabrouille1, K. Perrett, C. Pritchet, N. Regnault2, J. Rich1
1 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
2 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
CNRS : UMR7585 – IN2P3 – Université Pierre et Marie Curie (UPMC) - Paris VI – Université Paris VII - Paris Diderot
Barre 12-22, 1er étage 4 Place Jussieu 75252 Paris Cedex 05
3 :  CPPM - Centre de Physique des Particules de Marseille
CNRS : UMR7346 – IN2P3 – Université de la Méditerranée - Aix-Marseille II
163, avenue de Luminy - Case 902 - 13288 Marseille cedex 09
We use the wide-field capabilities of the 2dF fibre positioner and the AAOmega spectrograph on the Anglo-Australian Telescope (AAT) to obtain redshifts of galaxies that hosted supernovae during the first three years of the Supernova Legacy Survey (SNLS). With exposure times ranging from 10 to 60 ksec per galaxy, we were able to obtain redshifts for 400 host galaxies in two SNLS fields, thereby substantially increasing the total number of SNLS supernovae with host galaxy redshifts. The median redshift of the galaxies in our sample that hosted photometrically classified Type Ia supernovae (SNe Ia) is 0.77, which is 25% higher than the median redshift of spectroscopically confirmed SNe Ia in the three-year sample of the SNLS. Our results demonstrate that one can use wide-field fibre-fed multi-object spectrographs on 4m telescopes to efficiently obtain redshifts for large numbers of supernova host galaxies over the large areas of sky that will be covered by future high-redshift supernova surveys, such as the Dark Energy Survey.

Articles dans des revues avec comité de lecture
Publications of the Astronomical Society of Australia
Publisher Cambridge University Press (CUP)
ISSN 1323-3580 
© Cambridge University Press 2012

22 pages, 4 figures, accepted for publication in PASA
cosmology: observations – galaxies: clusters: general – galaxies: general – supernovae: general – white dwarfs
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