Search: onr:"swepub:oai:DiVA.org:su-108382" >
Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
- Article/chapterEnglish2014
Publisher, publication year, extent ...
-
2014-08-08
-
EDP Sciences,2014
-
printrdacarrier
Numbers
-
LIBRIS-ID:oai:DiVA.org:su-108382
-
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-108382URI
-
https://doi.org/10.1051/0004-6361/201423413DOI
Supplementary language notes
-
Language:English
-
Summary in:English
Part of subdatabase
Classification
-
Subject category:ref swepub-contenttype
-
Subject category:art swepub-publicationtype
Notes
-
AuthorCount:63;
-
Aims. We present cosmological constraints from a joint analysis of type la supernova (SN Ia) observations obtained by the SDSS-II and SNLS collaborations. The dataset includes several low-redshift samples (z < 0.1), all three seasons from the SDSS-11 (0.05 < z < 0.4), and three years from SNLS (0.2 < z < 1), and it totals 740 spectroscopically confirmed type la supernovae with high quality light curves. Methods. We followed the methods and assumptions of the SNLS three-year data analysis except for the following important improvements: I) the addition of the full SDSS-II spectroscopically-confirmed SN la sample in both the training of the SALT2 light-curve model and in the Hubble diagram analysis (374 SNe); 2) intercalibration of the SNLS and SDSS surveys and reduced systematic uncertainties in the photometric calibration, performed blindly with respect to the cosmology analysis; and 3) a thorough investigation of systematic errors associated with the SALT2 modeling of SN la light curves. Results. We produce recalibrated SN la light curves and associated distances for the SDSS-II and SNLS samples. The large SOSS-II sample provides an effective, independent, low -z anchor for the Hubble diagram and reduces the systematic error from calibration systematics in the low -z SN sample. For a flat ACDM cosmology, we find Omega(m), = 0.295 0.034 (stat+sys), a value consistent with the most recent cosmic microwave background (CMB) measurement from the Planck and WMAP experiments. Our result is 1.8 sigma (stat+sys) different than the previously published result of SNLS three-year data. The change is due primarily to improvements in the SNLS photometric calibration. When combined with CMB constraints, we measure a constant dark energy equation of state parameter omega = -1.018 +/- 0,057 (sral+sys) for a fiat universe. Adding baryon acoustic oscillation distance measurements gives similar constraints: omega = 59 -1.027 0.055. Our supernova measurements provide the most stringent constraints to date on the nature of dark energy.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
-
Kessler, R.
(author)
-
Guy, J.
(author)
-
Mosher, J.
(author)
-
Hardin, D.
(author)
-
Biswas, R.
(author)
-
Astier, P.
(author)
-
El-Hage, P.
(author)
-
Konig, M.
(author)
-
Kuhlmann, S.
(author)
-
Marriner, J.
(author)
-
Pain, R.
(author)
-
Regnault, N.
(author)
-
Balland, C.
(author)
-
Bassett, B. A.
(author)
-
Brown, P. J.
(author)
-
Campbell, H.
(author)
-
Carlberg, R. G.
(author)
-
Cellier-Holzern, F.
(author)
-
Cinabro, D.
(author)
-
Conley, A.
(author)
-
D'Andrea, C. B.
(author)
-
DePoy, D. L.
(author)
-
Doi, M.
(author)
-
Ellis, R. S.
(author)
-
Fabbro, S.
(author)
-
Filippenko, A. V.
(author)
-
Foley, R. J.
(author)
-
Frieman, J. A.
(author)
-
Fouchez, D.
(author)
-
Galbany, L.
(author)
-
Goobar, ArielStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)ariel
(author)
-
Gupta, R. R.
(author)
-
Hill, G. J.
(author)
-
Hlozek, R.
(author)
-
Hogan, C. J.
(author)
-
Hook, I. M.
(author)
-
Howell, D. A.
(author)
-
Jha, S. W.
(author)
-
Le Guillou, L.
(author)
-
EGENLeloudas, G.
(author)
-
Lidrnan, C.
(author)
-
Marshall, J. L.
(author)
-
Moeller, A.
(author)
-
Mourao, A. M.
(author)
-
Neveu, J.
(author)
-
Nichol, R.
(author)
-
Olmstead, M. D.
(author)
-
Palanque-Delabrouille, N.
(author)
-
Perlinutter, S.
(author)
-
Prieto, J. L.
(author)
-
Pritchet, C. J.
(author)
-
Richinond, M.
(author)
-
Riess, A. G.
(author)
-
Ruhlmann-Kleider, V.
(author)
-
Sako, M.
(author)
-
Sehahmaneche, K.
(author)
-
Schneider, D. P.
(author)
-
Smith, M.
(author)
-
Sollerman, JesperStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)solle
(author)
-
Sullivan, M.
(author)
-
Walton, N. A.
(author)
-
Wheeler, C. J.
(author)
-
Stockholms universitetFysikum
(creator_code:org_t)
Related titles
-
In:Astronomy and Astrophysics: EDP Sciences568, s. A22-0004-63611432-0746
Internet link
To the university's database
- By the author/editor
-
Betoule, M.
-
Kessler, R.
-
Guy, J.
-
Mosher, J.
-
Hardin, D.
-
Biswas, R.
-
show more...
-
Astier, P.
-
El-Hage, P.
-
Konig, M.
-
Kuhlmann, S.
-
Marriner, J.
-
Pain, R.
-
Regnault, N.
-
Balland, C.
-
Bassett, B. A.
-
Brown, P. J.
-
Campbell, H.
-
Carlberg, R. G.
-
Cellier-Holzern, ...
-
Cinabro, D.
-
Conley, A.
-
D'Andrea, C. B.
-
DePoy, D. L.
-
Doi, M.
-
Ellis, R. S.
-
Fabbro, S.
-
Filippenko, A. V ...
-
Foley, R. J.
-
Frieman, J. A.
-
Fouchez, D.
-
Galbany, L.
-
Goobar, Ariel
-
Gupta, R. R.
-
Hill, G. J.
-
Hlozek, R.
-
Hogan, C. J.
-
Hook, I. M.
-
Howell, D. A.
-
Jha, S. W.
-
Le Guillou, L.
-
EGENLeloudas, G.
-
Lidrnan, C.
-
Marshall, J. L.
-
Moeller, A.
-
Mourao, A. M.
-
Neveu, J.
-
Nichol, R.
-
Olmstead, M. D.
-
Palanque-Delabro ...
-
Perlinutter, S.
-
Prieto, J. L.
-
Pritchet, C. J.
-
Richinond, M.
-
Riess, A. G.
-
Ruhlmann-Kleider ...
-
Sako, M.
-
Sehahmaneche, K.
-
Schneider, D. P.
-
Smith, M.
-
Sollerman, Jespe ...
-
Sullivan, M.
-
Walton, N. A.
-
Wheeler, C. J.
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Astronomy Astrop ...
- Articles in the publication
-
Astronomy and As ...
- By the university
-
Stockholm University