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An efficient approach to obtaining large numbers of distant supernova host galaxy redshifts

Citation

Lidman, C and Ruhlmann-Klieder, V and Sullivan, M and Myzska, J and Dobbie, PD and Glazebrook, K and Mould, J and Astier, P and Balland, C and Betoule, M and Carlberg, R and Conley, A and Fouchez, D and Guy, J and Hardin, D and Hook, I and Howell, DA and Pain, R and Palanque-Delabrouille, N and Perrett, K and Pritchet, C and Regnault, N and Rich, J, An efficient approach to obtaining large numbers of distant supernova host galaxy redshifts, Publications of the Astronomical Society of Australia, 30, (January 2013) Article e001. ISSN 1448-6083 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Astronomical Society of Australia

DOI: doi:10.1017/pasa.2012.001

Abstract

We use the wide-field capabilities of the 2 degree field fibre positioner and the AAOmega spectrograph on the Anglo-Australian Telescope (AAT) to obtain redshifts of galaxies that hosted supernovae during the first 3 years of the Supernova Legacy Survey (SNLS). With exposure times ranging from 10 to 60 ks 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 z ~ 0.77, which is 25% higher than the median redshift of spectroscopically confirmed SNe Ia in the 3-year sample of the SNLS. Our results demonstrate that one can use wide-field fibre-fed multi-object spectrographs on 4-m telescopes to efficiently obtain redshifts for large numbers of supernova host galaxies over the large areas of the sky that will be covered by future high-redshift supernova surveys, such as the Dark Energy Survey.

Item Details

Item Type:Refereed Article
Keywords:cosmology: observations; galaxies: clusters: general; galaxies: general; supernovae: general; white dwarfs
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Cosmology and Extragalactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Dobbie, PD (Dr Paul Dobbie)
ID Code:84566
Year Published:2013
Web of Science® Times Cited:3
Deposited By:Mathematics and Physics
Deposited On:2013-05-20
Last Modified:2013-06-27
Downloads:0

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