Peculiar velocities with type Ia supernovae from the Nearby Supernova Factory XII th Rencontres du Vietnam - Large Scale Structure and Galaxy Flows Ulrich Feindt, Oskar Klein Centre, Stockholm July 4th 2016 on the behalf of SNfactory
SNfactory Pereira et al. 2013 Time Series of Type Ia Supernovae • ~200 SNe for classic cosmology • ~ redshift [0.03 ; 0.08] • ~15 spectra per SNe • median fjrst phase -4.6 days Ulrich Feindt 2
SNfactory Pereira et al. 2013 Synthesize Light Curves in any fjlter system Pereira et al. 2013 Ulrich Feindt 3
SNfactory Pereira et al. 2013 Test the accuracy of current K -corrections (efgect on w ~3%) Saunders et al. 2015 Ulrich Feindt 4
SNfactory Pereira et al. 2013 Twinning dispersion as low as 0.07 mag Fahkouri et al. 2015 Ulrich Feindt 5
SNfactory 3D Spectroscopy Local Environment and SNe Observed Simultaneously Ulrich Feindt 6
Astrophysical Bias in Cosmology Rigault et al. 2013, 2015 Rigault et al. in prep. Standardized SN Luminosity Older Younger Age of surrounding stars Ulrich Feindt 7
Correct Astrophysics for Accurate Cosmology ( H 0 ) Still debated (Riess et al. 2016 to be checked) Indirect Direct Λ (z~1000 ; CDM) z~0 ; SNe Ia Ulrich Feindt 8
Measuring Bulk Flows with SNfactory Analysis of 279 SNe (z < 0.1) from Union2 and SNfactory 0.015 < z < 0.035 128 SNe Bulk fmow: p = 0.027 243 ± 88 km/s Feindt et al. 2013 Ulrich Feindt 9
Constraining “Dark Flow” NB: 95% limits shown ΛCDM Adapted from: Planck Collab. (2014), A&A 561, A97 Ulrich Feindt 10
Attractor Model for Shapley Spherical attractor model ● Single attractor at location of Shapley supercluster disfavored at ~2σ ● Sloan Great Wall could provide required additional mass Feindt et al. 2013 Ulrich Feindt 11
Outlook: Updated Bulk Flow Study New bulk fmow study in prep. ● SNfactory sample size doubled ● Based on minimum variance weights (Watkins et al. 2009) Ulrich Feindt 12
Zwicky Transient Facility P48 (1.2m Schmidt telescope) Palomar Observatory Ulrich Feindt 13
ZTF Field of View Ulrich Feindt 14
ZTF camera Survey speed increased by an order of magnitude: 3750 deg 2 /hour (3π in 8 hours) • Observation in g, R and I • Expecting ~1800 well-sampled multi-color • SN Ia lightcurves (0.03 < z < 0.08) Ulrich Feindt 15
ZTF Bulk Flow Prediction Simulation of ZTF-like survey (Feindt et al. in prep.) y 1800 SNe Ia at Dec. > -20° • r Redshift 0.03 < z < 0.08 • a n Bulk fmow/shear fjts in • i spheres up to z = 0.08 m Bulk fmow constraints almost • i at size of ΛCDM prediction l e Shear constraints require • r southern data P ΛCDM Further planned ZTF analysis: PV power spectrum; • growth factor f σ 8 Adapted from: Planck Collab. (2014), A&A 561, A97 Ulrich Feindt 16
Conclusions The Nearby Supernova Factory has obtained ~200 SN Ia time series Measure bulk flows Improve SNe Ia Correct astrophysical out to z < 0.1 as standard candles biases ( w, H 0 ) The Zwicky Transient Facility will obtain ~1800 SN Ia lightcurves Constrain bulk flows at z < 0.08 Extend SN Ia PV studies to at < 100 km s -1 precision shear, growth factor etc. Ulrich Feindt 17
SNfactory Pereira et al. 2013 Understand the SN Ia progenitor(s) ( simulations ) Roepke et al. 2012 Ulrich Feindt 18
ZTF Shear Prediction Median uncertainty of fjrst shear eigenvalue y r a n i m i l e r P Ulrich Feindt 19
Correct Astrophysics for Accurate Cosmology ( w ) Rigault et al. (2013) 50% Young 90% Young Prediction 50% Old 10% Old L SN (z) Galaxies are more Star Forming at Higher Redshift L SN (z) Could impact w by a few % Ulrich Feindt 20
The Local Perspective Rigault et al. (2013) α H map Global Locale Star forming Environments — Young stars Spiral, Star forming Galaxies Passive Environments — Old(er) stars Ulrich Feindt 21
Correct Astrophysics for Accurate Cosmology Access Better Standard Candles – Confirmed par Kelly et al. (2014) – « Youngs » Strong Reduction of the Systematic Uncertainties Rigault et al. (2013) Ulrich Feindt 22
Recommend
More recommend
