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Photometric Type Ia...
Photometric Type Ia Supernova Candidates from the Three-year SDSS-II SN Survey Data
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Sako, Masao (author)
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Bassett, Bruce (author)
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Connolly, Brian (author)
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Dilday, Benjamin (author)
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Cambell, Heather (author)
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Frieman, Joshua A. (author)
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Gladney, Larry (author)
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Kessler, Richard (author)
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Lampeitl, Hubert (author)
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Marriner, John (author)
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Miquel, Ramon (author)
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Nichol, Robert C. (author)
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Schneider, Donald P. (author)
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Smith, Mathew (author)
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- Sollerman, Jesper (author)
- Stockholms universitet,Institutionen för astronomi,The Oskar Klein Centre
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(creator_code:org_t)
- 2011
- 2011
- English.
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In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 738, s. 162-
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- We analyze the three-year Sloan Digital Sky Survey II (SDSS-II) Supernova (SN) Survey data and identify a sample of 1070 photometric Type Ia supernova (SN Ia) candidates based on their multiband light curve data. This sample consists of SN candidates with no spectroscopic confirmation, with a subset of 210 candidates having spectroscopic redshifts of their host galaxies measured while the remaining 860 candidates are purely photometric in their identification. We describe a method for estimating the efficiency and purity of photometric SN Ia classification when spectroscopic confirmation of only a limited sample is available, and demonstrate that SN Ia candidates from SDSS-II can be identified photometrically with ~91% efficiency and with a contamination of ~6%. Although this is the largest uniform sample of SN candidates to date for studying photometric identification, we find that a larger spectroscopic sample of contaminating sources is required to obtain a better characterization of the background events. A Hubble diagram using SN candidates with no spectroscopic confirmation, but with host galaxy spectroscopic redshifts, yields a distance modulus dispersion that is only ~20%-40% larger than that of the spectroscopically confirmed SN Ia sample alone with no significant bias. A Hubble diagram with purely photometric classification and redshift-distance measurements, however, exhibits biases that require further investigation for precision cosmology.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- cosmology: observations
- supernovae: general
- surveys
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Sako, Masao
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Bassett, Bruce
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Connolly, Brian
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Dilday, Benjamin
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Cambell, Heather
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Frieman, Joshua ...
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show more...
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Gladney, Larry
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Kessler, Richard
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Lampeitl, Hubert
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Marriner, John
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Miquel, Ramon
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Nichol, Robert C ...
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Schneider, Donal ...
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Smith, Mathew
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Sollerman, Jespe ...
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
- Articles in the publication
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Astrophysical Jo ...
- By the university
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Stockholm University