Supernova constraints and systematic uncertainties from the first three years of the Supernova Legacy Survey
We combine high-redshift Type Ia supernovae from the first three years of the Supernova Legacy Survey (SNLS) with other supernova (SN) samples, primarily at lower redshifts, to form a high-quality joint sample of 472 SNe (123 low-z, 93 SDSS, 242 SNLS, and 14 Hubble Space Telescope). SN data alone re...
| Principais autores: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Journal article |
| Idioma: | English |
| Publicado em: |
2011
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| _version_ | 1826290742782328832 |
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| author | Conley, A Guy, J Sullivan, M Regnault, N Astier, P Balland, C Basa, S Carlberg, R Fouchez, D Hardin, D Hook, I Howell, D Pain, R Palanque-Delabrouille, N Perrett, K Pritchet, C Rich, J Ruhlmann-Kleider, V Balam, D Baumont, S Ellis, R Fabbro, S Fakhouri, H Fourmanoit, N González-Gaitán, S |
| author_facet | Conley, A Guy, J Sullivan, M Regnault, N Astier, P Balland, C Basa, S Carlberg, R Fouchez, D Hardin, D Hook, I Howell, D Pain, R Palanque-Delabrouille, N Perrett, K Pritchet, C Rich, J Ruhlmann-Kleider, V Balam, D Baumont, S Ellis, R Fabbro, S Fakhouri, H Fourmanoit, N González-Gaitán, S |
| author_sort | Conley, A |
| collection | OXFORD |
| description | We combine high-redshift Type Ia supernovae from the first three years of the Supernova Legacy Survey (SNLS) with other supernova (SN) samples, primarily at lower redshifts, to form a high-quality joint sample of 472 SNe (123 low-z, 93 SDSS, 242 SNLS, and 14 Hubble Space Telescope). SN data alone require cosmic acceleration at >99.999% confidence, including systematic effects. For the dark energy equation of state parameter (assumed constant out to at least z = 1.4) in a flat universe, we find w = -0.91-0.20+0.16 (stat)+0.07-0.14 (sys) from SNe only, consistent with a cosmological constant. Our fits include a correction for the recently discovered relationship between hostgalaxy mass and SN absolute brightness. We pay particular attention to systematic uncertainties, characterizing them using a systematic covariance matrix that incorporates the redshift dependence of these effects, as well as the shape-luminosity and color-luminosity relationships. Unlike previous work, we include the effects of systematic terms on the empirical light-curve models. The total systematic uncertainty is dominated by calibration terms. We describe how the systematic uncertainties can be reduced with soon to be available improved nearby and intermediate-redshift samples, particularly those calibrated onto USNO/SDSS-like systems. © 2011. |
| first_indexed | 2024-03-07T02:48:51Z |
| format | Journal article |
| id | oxford-uuid:acfbebfe-1ea1-454a-a5b7-d2a89ec23de1 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:48:51Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | oxford-uuid:acfbebfe-1ea1-454a-a5b7-d2a89ec23de12022-03-27T03:32:27ZSupernova constraints and systematic uncertainties from the first three years of the Supernova Legacy SurveyJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:acfbebfe-1ea1-454a-a5b7-d2a89ec23de1EnglishSymplectic Elements at Oxford2011Conley, AGuy, JSullivan, MRegnault, NAstier, PBalland, CBasa, SCarlberg, RFouchez, DHardin, DHook, IHowell, DPain, RPalanque-Delabrouille, NPerrett, KPritchet, CRich, JRuhlmann-Kleider, VBalam, DBaumont, SEllis, RFabbro, SFakhouri, HFourmanoit, NGonzález-Gaitán, SWe combine high-redshift Type Ia supernovae from the first three years of the Supernova Legacy Survey (SNLS) with other supernova (SN) samples, primarily at lower redshifts, to form a high-quality joint sample of 472 SNe (123 low-z, 93 SDSS, 242 SNLS, and 14 Hubble Space Telescope). SN data alone require cosmic acceleration at >99.999% confidence, including systematic effects. For the dark energy equation of state parameter (assumed constant out to at least z = 1.4) in a flat universe, we find w = -0.91-0.20+0.16 (stat)+0.07-0.14 (sys) from SNe only, consistent with a cosmological constant. Our fits include a correction for the recently discovered relationship between hostgalaxy mass and SN absolute brightness. We pay particular attention to systematic uncertainties, characterizing them using a systematic covariance matrix that incorporates the redshift dependence of these effects, as well as the shape-luminosity and color-luminosity relationships. Unlike previous work, we include the effects of systematic terms on the empirical light-curve models. The total systematic uncertainty is dominated by calibration terms. We describe how the systematic uncertainties can be reduced with soon to be available improved nearby and intermediate-redshift samples, particularly those calibrated onto USNO/SDSS-like systems. © 2011. |
| spellingShingle | Conley, A Guy, J Sullivan, M Regnault, N Astier, P Balland, C Basa, S Carlberg, R Fouchez, D Hardin, D Hook, I Howell, D Pain, R Palanque-Delabrouille, N Perrett, K Pritchet, C Rich, J Ruhlmann-Kleider, V Balam, D Baumont, S Ellis, R Fabbro, S Fakhouri, H Fourmanoit, N González-Gaitán, S Supernova constraints and systematic uncertainties from the first three years of the Supernova Legacy Survey |
| title | Supernova constraints and systematic uncertainties from the first three years of the Supernova Legacy Survey |
| title_full | Supernova constraints and systematic uncertainties from the first three years of the Supernova Legacy Survey |
| title_fullStr | Supernova constraints and systematic uncertainties from the first three years of the Supernova Legacy Survey |
| title_full_unstemmed | Supernova constraints and systematic uncertainties from the first three years of the Supernova Legacy Survey |
| title_short | Supernova constraints and systematic uncertainties from the first three years of the Supernova Legacy Survey |
| title_sort | supernova constraints and systematic uncertainties from the first three years of the supernova legacy survey |
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