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SDSSII Supernova Survey

SDSSII Supernova Survey. Bob Nichol (Portsmouth). Zheng (Poster) Mon Exhibit Hall DE Lampeitl (Oral) Wed 10:45am Exhibit Hall C Dilday (Oral) Thurs 2:30pm Telus 111 Special Session Thurs “LSS in the SDSS”. SDSSII SNe Survey Exploring DE & SNe at an epoch when DE dominates.

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SDSSII Supernova Survey

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  1. SDSSII Supernova Survey Bob Nichol (Portsmouth) Zheng (Poster) Mon Exhibit Hall DE Lampeitl (Oral) Wed 10:45am Exhibit Hall C Dilday (Oral) Thurs 2:30pm Telus 111 Special Session Thurs “LSS in the SDSS”

  2. SDSSII SNe SurveyExploring DE & SNe at an epoch when DE dominates • Type Ia supernovae (SNe) • spectroscopically confirm and obtain “well-measured” light curves of ~300 SN Ia from z = 0.05 ~ 0.4 • bridge low-z (z<0.05; LOSS, SNF) and high-z (0.3<z<1.0; ESSENCE, SNLS) sources • Anchor the Hubble diagram • understand and minimize systematics of SN Ia as distance indicators Riess et al. (2004) compilation Astier et al. (2005)

  3. SNe Survey N S Use the SDSS 2.5m telescope • September 1 - November 30 of 2005-2007 • Scan 300 square degrees every 2 days • Obtain multi-color light curves • >90% efficiency after ~2 - 4 epochs

  4. Results from 2005 • 130 spectroscopically confirmed SN Ia • Galaxy redshifts for 25 additional Ia candidates) • International follow-up using ARC3.5m, HET, MDM, WHT, Subaru & NTT <z> = 0.21

  5. Empirical Correlations SNIa’s are “the most powerful and best proven technique for studying dark energy. The power of the experiment as reflected in the DETF figure of merit is much better known than for other techniques with the outcome depending on the uncertainties in supernova evolution and in the astronomical flux calibration.” DETF Report 2006 To understand uncertainties for future missions we need to look for empirical evidence of SNe evolution. Simulations can’t help us. • Evolution with redshift, • Correlations with galaxy properties, • Correlations of SNIa properties SDSS sample is ideal for this because of the size and quality of the dataset. Lots of ancillary information from main SDSS sample and superb photometric properties.

  6. Luminosity (stellar mass) LOW (0.013 < z < 0.155) INTERMEDIATE (0.55 < z < 0.263) HIGH (0.263 < z < 0.41)

  7. Color (SFH) LOW (0.013 < z < 0.155) INTERMEDIATE (0.55 < z < 0.263) HIGH (0.263 < z < 0.41) RED BLUE

  8. Morphology (Dynamics) LOW (0.013 < z < 0.155) INTERMEDIATE (0.55 < z < 0.263) HIGH (0.263 < z < 0.41) spiral-like elliptical-like

  9. Comparison with all galaxies Volume limited sample of SNIa’s and SDSS galaxies Statistically no evidence for any differences

  10. Conclusions • SDSS is up and running. Fastest SNIa discovery rate of any SNe search • International network of telescopes folowing up objects • SDSS is ideal sample for detailed studies of SNe as “standard candles” • No obvious correlations found. SNIa’s appear to be in a “random subsample” of galaxies. • More data to come over the next 18months

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