Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-09-05
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
(The SNLS collaboration) 23 pages, 28 figures, Accepted in A&A
Scientific paper
We present a sample of 485 photometrically identified Type Ia supernova candidates mined from the first three years of data of the CFHT SuperNova Legacy Survey (SNLS). The images were submitted to a deferred processing independent of the SNLS real-time detection pipeline. Light curves of all transient events were reconstructed in the g_M, r_M, i_M and z_M filters and submitted to automated sequential cuts in order to identify possible supernovae. Pure noise and long-term variable events were rejected by light curve shape criteria. Type Ia supernova identification relied on event characteristics fitted to their light curves assuming the events to be normal SNe Ia. The light curve fitter SALT2 was used for this purpose, assigning host galaxy photometric redshifts to the tested events. The selected sample of 485 candidates is one magnitude deeper than that allowed by the SNLS spectroscopic identification. The contamination by supernovae of other types is estimated to be 4%. Testing Hubble diagram residuals with this enlarged sample allows us to measure the Malmquist bias due to spectroscopic selections directly. The result is fully consistent with the precise Monte Carlo based estimate used to correct SN Ia distance moduli in the SNLS 3-year cosmological analyses. This paper demonstrates the feasibility of a photometric selection of high redshift supernovae with known host galaxy redshifts, opening interesting prospects for cosmological analyses from future large photometric SN Ia surveys.
Astier Pierre
Aubourg Eric
Balland Christophe
Basa Stephane
Bazin Gurvan
No associations
LandOfFree
Photometric selection of Type Ia supernovae in the Supernova Legacy Survey does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Photometric selection of Type Ia supernovae in the Supernova Legacy Survey, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photometric selection of Type Ia supernovae in the Supernova Legacy Survey will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-450276