The Type Ia Supernova Rate at z ~0.5 from the Supernova Legacy Survey

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dc.creatorNeill, J. D.
dc.creatorSullivan, M.
dc.creatorBalam, D.
dc.creatorPritchet, C. J.
dc.creatorHowell, D. A.
dc.creatorPerrett, K.
dc.creatorAstier, P.
dc.creatorAubourg, E.
dc.creatorBasa, S.
dc.creatorCarlberg, R. G.
dc.creatorConley, A.
dc.creatorFabbro, S.
dc.creatorFouchez, D.
dc.creatorGuy, J.
dc.creatorHook, I.
dc.creatorPain, R.
dc.creatorPalanque-Delabrouille, N.
dc.creatorRegnault, N.
dc.creatorRich, J.
dc.creatorTaillet, R.
dc.creatorAldering, G.
dc.creatorAntilogus, P.
dc.creatorBalland, C.
dc.creatorBaumont, S.
dc.creatorBronder, J.
dc.creatorEllis, R. S.
dc.creatorFiliol, M.
dc.creatorGoncalves, A.
dc.creatorKowalski, M.
dc.creatorLidman, C.
dc.creatorLusset, V.
dc.creatorMouchet, M.
dc.creatorPerlmutter, S.
dc.creatorRipoche, P.
dc.creatorSchlegel, D.
dc.creatorTao, C.
dc.date2006-05-05
dc.date2007-06-21
dc.date.accessioned2026-07-07T11:25:34Z
dc.date.available2026-07-07T11:25:34Z
dc.descriptionWe present a measurement of the distant Type Ia supernova rate derived from the first two years of the Canada -- France -- Hawaii Telescope Supernova Legacy Survey. We observed four one-square degree fields with a typical temporal frequency of <Delta t> ~ 4 observer-frame days over time spans of from 158 to 211 days per season for each field, with breaks during full moon. We used 8-10 meter-class telescopes for spectroscopic followup to confirm our candidates and determine their redshifts. Our starting sample consists of 73 spectroscopically verified Type Ia supernovae in the redshift range 0.2 < z < 0.6. We derive a volumetric SN Ia rate of r_V(<z>=0.47) = 0.42^{+0.13}_{-0.09} (systematic) +- 0.06 (statistical) X 10^-4 yr^-1 Mpc^3, assuming h = 0.7, Omega_m = 0.3 and a flat cosmology. Using recently published galaxy luminosity functions derived in our redshift range, we derive a SN Ia rate per unit luminosity of r_L(<z>=0.47) = 0.154^{+0.048}_{-0.033} (systematic) ^{+0.039}_{-0.031} (statistical) SNu. Using our rate alone, we place an upper limit on the component of SN Ia production that tracks the cosmic star formation history of 1 SN Ia per 10^3 M_sun of stars formed. Our rate and other rates from surveys using spectroscopic sample confirmation display only a modest evolution out to z=0.55.
dc.description71 pages, 12 figures, accepted for publication in AJ, fixed typos in Eq 3 and 4
dc.identifierhttps://arxiv.org/abs/astro-ph/0605148
dc.identifierhttp://arxiv.org/abs/astro-ph/0605148
dc.identifierAstron.J.132:1126-1145,2006
dc.identifierdoi:10.1086/505532
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195547
dc.subjectAstrophysics
dc.titleThe Type Ia Supernova Rate at z ~0.5 from the Supernova Legacy Survey
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