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The Data Release of the Sloan Digital Sky Survey-II Supernova Survey
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Number of Authors: 492018 (English)In: Publications of the Astronomical Society of the Pacific, ISSN 0004-6280, E-ISSN 1538-3873, Vol. 130, no 988, article id 064002Article in journal (Refereed) Published
Abstract [en]

This paper describes the data release of the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey conducted between 2005 and 2007. Light curves, spectra, classifications, and ancillary data are presented for 10,258 variable and transient sources discovered through repeat ugriz imaging of SDSS Stripe 82, a 300 deg(2) area along the celestial equator. This data release is comprised of all transient sources brighter than r similar or equal to 22.5 mag with no history of variability prior to 2004. Dedicated spectroscopic observations were performed on a subset of 889 transients, as well as spectra for thousands of transient host galaxies using the SDSS-III BOSS spectrographs. Photometric classifications are provided for the candidates with good multi-color light curves that were not observed spectroscopically, using host galaxy redshift information when available. From these observations, 4607 transients are either spectroscopically confirmed, or likely to be, supernovae, making this the largest sample of supernova candidates ever compiled. We present a new method for SN host-galaxy identification and derive host-galaxy properties including stellar masses, star formation rates, and the average stellar population ages from our SDSS multi-band photometry. We derive SALT2 distance moduli for a total of 1364 SN. Ia with spectroscopic redshifts as well as photometric redshifts for a further 624 purely photometric SN. Ia candidates. Using the spectroscopically confirmed subset of the three-year SDSS-II SN. Ia sample and assuming a flat.CDM cosmology, we determine Omega(M) = 0.315 +/- 0.093 (statistical error only) and detect a non-zero cosmological constant at 5.7 sigma.

Place, publisher, year, edition, pages
2018. Vol. 130, no 988, article id 064002
Keywords [en]
cosmology: observations, supernovae: general, surveys
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-166873DOI: 10.1088/1538-3873/aab4e0ISI: 000456548800001OAI: oai:DiVA.org:su-166873DiVA, id: diva2:1294078
Available from: 2019-03-06 Created: 2019-03-06 Last updated: 2019-12-10Bibliographically approved

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Galbany, LluisGoobar, ArielÖstman, LindaSollerman, Jesper
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)Department of Astronomy
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