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Peculiar velocities with type Ia supernovae from the Nearby - - PowerPoint PPT Presentation

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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

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July 4th 2016

Peculiar velocities with type Ia supernovae from the Nearby Supernova Factory

XIIth Rencontres du Vietnam - Large Scale Structure and Galaxy Flows

Ulrich Feindt, Oskar Klein Centre, Stockholm

  • n the behalf of SNfactory
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Ulrich Feindt

SNfactory

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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
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Ulrich Feindt

SNfactory

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Synthesize Light Curves in any fjlter system

Pereira et al. 2013 Pereira et al. 2013

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Ulrich Feindt

SNfactory

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Test the accuracy of current K-corrections (efgect on w~3%)

Saunders et al. 2015 Pereira et al. 2013

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Ulrich Feindt

SNfactory

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Twinning dispersion as low as 0.07 mag

Fahkouri et al. 2015 Pereira et al. 2013

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Ulrich Feindt

SNfactory 3D Spectroscopy

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Local Environment and SNe Observed Simultaneously

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Ulrich Feindt

Astrophysical Bias in Cosmology

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Rigault et al. 2013, 2015

Older

Age of surrounding stars Standardized SN Luminosity

Younger

Rigault et al. in prep.

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Ulrich Feindt 8

Direct

z~0 ; SNe Ia

Indirect

(z~1000 ; CDM) Λ

Correct Astrophysics for Accurate Cosmology (H0)

Still debated (Riess et al. 2016 to be checked)

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SLIDE 9

Ulrich Feindt

Measuring Bulk Flows with SNfactory

128 SNe p = 0.027 Bulk fmow: 243 ± 88 km/s 0.015 < z < 0.035

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Analysis of 279 SNe (z < 0.1) from Union2 and SNfactory

Feindt et al. 2013

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Ulrich Feindt

Constraining “Dark Flow”

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Adapted from: Planck Collab. (2014), A&A 561, A97

ΛCDM NB: 95% limits shown

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Ulrich Feindt

Attractor Model for Shapley

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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

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Ulrich Feindt

Outlook: Updated Bulk Flow Study

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New bulk fmow study in prep.

  • SNfactory sample size doubled
  • Based on minimum variance weights

(Watkins et al. 2009)

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Ulrich Feindt

Zwicky Transient Facility

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P48 (1.2m Schmidt telescope) Palomar Observatory

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Ulrich Feindt

ZTF Field of View

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Ulrich Feindt

ZTF camera

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Survey speed increased by an order of magnitude:

  • 3750 deg2/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)

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Ulrich Feindt

ZTF Bulk Flow Prediction

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P r e l i m i n a r y

Simulation of ZTF-like survey

(Feindt et al. in prep.)

  • 1800 SNe Ia at Dec. > -20°
  • Redshift 0.03 < z < 0.08
  • Bulk fmow/shear fjts in

spheres up to z = 0.08

  • Bulk fmow constraints almost

at size of ΛCDM prediction

  • Shear constraints require

southern data Further planned ZTF analysis:

  • PV power spectrum;

growth factor f σ8

Adapted from: Planck Collab. (2014), A&A 561, A97

ΛCDM

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Ulrich Feindt

Conclusions

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The Nearby Supernova Factory has obtained ~200 SN Ia time series Improve SNe Ia as standard candles Correct astrophysical biases (w, H0) Measure bulk flows

  • ut to z < 0.1

The Zwicky Transient Facility will obtain ~1800 SN Ia lightcurves Constrain bulk flows at z < 0.08 at < 100 km s-1 precision Extend SN Ia PV studies to shear, growth factor etc.

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Ulrich Feindt

SNfactory

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Understand the SN Ia progenitor(s) (simulations)

Roepke et al. 2012 Pereira et al. 2013

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Ulrich Feindt

ZTF Shear Prediction

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Median uncertainty of fjrst shear eigenvalue

P r e l i m i n a r y

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Ulrich Feindt

Galaxies are more Star Forming at Higher Redshift

Could impact w by a few %

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50% Young 50% Old

90% Young

10% Old

Prediction

LSN(z) LSN(z)

Correct Astrophysics for Accurate Cosmology (w)

Rigault et al. (2013)

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Ulrich Feindt

The Local Perspective

Star forming Environments — Young stars Passive Environments — Old(er) stars

Spiral, Star forming Galaxies

Global Locale

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Rigault et al. (2013)

H map α

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Ulrich Feindt 22

Access Better Standard Candles

– Confirmed par Kelly et al. (2014) –

Strong Reduction of the Systematic Uncertainties

« Youngs »

Correct Astrophysics for Accurate Cosmology

Rigault et al. (2013)