skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The Effect of Peculiar Velocities on Supernova Cosmology

Journal Article · · Astrophys.J.
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [5];  [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [10]; ORCiD logo [11]; ORCiD logo [12]; ORCiD logo [13];  [14]
  1. Queensland U.; Bohr Inst.
  2. Columbia U.
  3. Chicago U., KICP; Chicago U.; Fermilab
  4. Bohr Inst.
  5. Chicago U.; Chicago U., KICP
  6. Queensland U.
  7. Bohr Inst.; Stockholm U., OKC
  8. Cape Town U., Dept. Math.; South African Astron. Observ.
  9. Fermilab
  10. Stockholm U.
  11. Portsmouth U., ICG
  12. Rochester Inst. Tech.
  13. Pennsylvania U.
  14. Penn State U.
+ Show Author Affiliations

We present an analysis of peculiar velocities and their effect on supernova cosmology. In particular, we study (a) the corrections due to our own motion, (b) the effects of correlations in peculiar velocities induced by large-scale structure, and (c) uncertainties arising from a possible local under- or over-density. For all of these effects we present a case study of their impact on the cosmology derived by the Sloan Digital Sky Survey-II Supernova Survey (SDSS-II SN Survey). Correcting supernova redshifts for the CMB dipole slightly over-corrects nearby supernovae that share some of our local motion. We show that while neglecting the CMB dipole would cause a shift in the derived equation of state of Delta w ~ 0.04 (at fixed matter density) the additional local-motion correction is currently negligible (Delta w<0.01). We use a covariance-matrix approach to statistically account for correlated peculiar velocities. This down-weights nearby supernovae and effectively acts as a graduated version of the usual sharp low-redshift cut. Neglecting coherent velocities in the current sample causes a systematic shift of ~2% in the preferred value of w and will therefore have to be considered carefully when future surveys aim for percent-level accuracy. Finally, we perform n-body simulations to estimate the likely magnitude of any local density fluctuation (monopole) and estimate the impact as a function of the low-redshift cutoff. We see that for this aspect the low-z cutoff of z=0.02 is well-justified theoretically, but that living in a putative local density fluctuation leaves an indelible imprint on the magnitude-redshift relation.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
DOE Contract Number:
AC02-07CH11359
OSTI ID:
1962619
Report Number(s):
FERMILAB-PUB-10-597-A; arXiv:1012.2912; oai:inspirehep.net:881232
Journal Information:
Astrophys.J., Vol. 741
Country of Publication:
United States
Language:
English

References (70)

Peculiar velocities into the next generation: cosmological parameters from large surveys without bias from non-linear structure: Peculiar velocities into the next generation journal August 2008
Local void vs dark energy: confrontation with WMAP and type Ia supernovae journal September 2009
CMB anisotropies seen by an off-center observer in a spherically symmetric inhomogeneous universe journal November 2006
Inhomogeneous alternative to dark energy? journal April 2006
The Supernova Legacy Survey: measurement of $\Omega_{\mathsf{M}}$, $\Omega_\mathsf{\Lambda}$ and w from the first year data set journal January 2006
First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Preliminary Maps and Basic Results journal September 2003
The WiggleZ Dark Energy Survey: the growth rate of cosmic structure since redshift z=0.9: WiggleZ Survey: growth of structure journal June 2011
The WiggleZ Dark Energy Survey: testing the cosmological model with baryon acoustic oscillations at z= 0.6: WiggleZ survey: BAOs at z = 0.6 journal June 2011
Do spectra improve distance measurements of Type Ia supernovae? journal December 2010
Fluctuations of the luminosity distance journal January 2006
Dipole of the Luminosity Distance: A Direct Measure of H(z) journal May 2006
Living in a Void: Testing the Copernican Principle with Distant Supernovae journal September 2008
Is There Evidence for a Hubble Bubble? The Nature of Type Ia Supernova Colors and Dust in External Galaxies journal July 2007
Measurement of Ω m , Ω Λ from a Blind Analysis of Type Ia Supernovae with CMAGIC: Using Color Information to Verify the Acceleration of the Universe journal June 2006
Local gravity versus local velocity: solutions for β and non-linear bias: Gravity versus velocity journal March 2011
Expanding Confusion: Common Misconceptions of Cosmological Horizons and the Superluminal Expansion of the Universe journal January 2004
Scrutinizing Exotic Cosmological Models Using ESSENCE Supernova Data Combined with Other Cosmological Probes journal September 2007
Detection of the Baryon Acoustic Peak in the Large‐Scale Correlation Function of SDSS Luminous Red Galaxies journal November 2005
Lemaitre–Tolman–Bondi model and accelerating expansion journal December 2007
The dipole anisotropy of the 2 Micron All-Sky Redshift Survey journal June 2006
THE CARNEGIE SUPERNOVA PROJECT: ANALYSIS OF THE FIRST SAMPLE OF LOW-REDSHIFT TYPE-Ia SUPERNOVAE journal December 2009
THE CARNEGIE SUPERNOVA PROJECT: FIRST NEAR-INFRARED HUBBLE DIAGRAM TO z ∼ 0.7 journal September 2009
The Sloan Digital sky Survey-Ii Supernova Survey: Technical Summary journal December 2007
The radial BAO scale and cosmic shear, a new observable for inhomogeneous cosmologies journal September 2009
The Century Survey: A Deeper Slice of the Universe journal December 1997
Determining the motion of the Solar system relative to the cosmic microwave background using Type Ia supernovae journal June 2008
On the pattern of perturbations of the Hubble flow journal September 1988
HEALPix: A Framework for High‐Resolution Discretization and Fast Analysis of Data Distributed on the Sphere journal April 2005
Constrained Local UniversE Simulations (CLUES) book January 2010
BVRI Light Curves for 29 Type IA Supernovae journal December 1996
The Velocity Field of the Local Universe from Measurements of Type Ia Supernovae journal June 2007
Correlation Properties of the Kinematic Sunyaev‐Zel’dovich Effect and Implications for Dark Energy journal June 2006
IMPROVED DARK ENERGY CONSTRAINTS FROM ∼100 NEW CfA SUPERNOVA TYPE Ia LIGHT CURVES journal July 2009
The Sloan Digital sky Survey-Ii: Photometry and Supernova ia Light Curves from the 2005 data journal November 2008
UBVRI Light Curves of 44 Type Ia Supernovae journal January 2006
Improved Distances to Type Ia Supernovae with Multicolor Light‐Curve Shapes: MLCS2k2 journal April 2007
A Measurement of Large-Scale Peculiar Velocities of Clusters of Galaxies: Results and Cosmological Implications journal September 2008
A Measurement of Large-Scale Peculiar Velocities of Clusters of Galaxies: Technical Details journal February 2009
First-Year Sloan Digital sky Survey-Ii Supernova Results: Hubble Diagram and Cosmological Parameters journal October 2009
Dipole Anisotropy in the COBE Differential Microwave Radiometers First-Year Sky Maps journal December 1993
FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE OBSERVATIONS: COSMOLOGICAL INTERPRETATION journal February 2009
SEVEN-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE ( WMAP ) OBSERVATIONS: COSMOLOGICAL INTERPRETATION journal January 2011
Improved Cosmological Constraints from New, Old, and Combined Supernova Data Sets journal October 2008
First-year Sloan Digital Sky Survey-II supernova results: consistency and constraints with other intermediate-redshift data sets journal February 2010
Misconceptions about the Big Bang journal March 2005
Observational constraints on the ΛLTB model journal December 2010
The Peculiar Velocities of Local Type Ia Supernovae and Their Impact on Cosmology journal May 2007
Bulk Flows from Galaxy Luminosities: Application to 2mass Redshift Survey and Forecast for Next-Generation data sets journal June 2011
THE COSMOLOGICAL BULK FLOW: CONSISTENCY WITH ΛCDM AND z ≈ 0 CONSTRAINTS ON σ 8 AND γ journal July 2011
First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Interpretation of the TT and TE Angular Power Spectrum Peaks journal September 2003
Measuring the Baryon Acoustic Oscillation scale using the Sloan Digital Sky Survey and 2dF Galaxy Redshift Survey: Measuring the BAO scale journal September 2007
Baryon acoustic oscillations in the Sloan Digital Sky Survey Data Release 7 galaxy sample journal February 2010
Measurements of Ω and Λ from 42 High‐Redshift Supernovae journal June 1999
Beyond the Thin Lens Approximation journal February 1996
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant journal September 1998
[ITAL]BVRI[/ITAL] Light Curves for 22 Type I[CLC]a[/CLC] Supernovae journal February 1999
New Hubble Space Telescope Discoveries of Type Ia Supernovae at z ≥ 1: Narrowing Constraints on the Early Behavior of Dark Energy journal April 2007
Type Ia Supernova Discoveries at z > 1 from the Hubble Space Telescope : Evidence for Past Deceleration and Constraints on Dark Energy Evolution journal June 2004
The Sloan Digital sky Survey-Ii Supernova Survey: Search Algorithm and Follow-Up Observations journal December 2007
The magnitude–redshift relation in a perturbed Friedmann universe journal October 1987
Residual Hubble-Bubble Effects on Supernova Cosmology journal July 2010
Three‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Implications for Cosmology journal June 2007
The cosmological simulation code gadget-2 journal December 2005
Cosmological constraints from the SDSS luminous red galaxies journal December 2006
Consistently large cosmic flows on scales of 100 h −1  Mpc : a challenge for the standard ΛCDM cosmology journal January 2009
Observational Constraints on the Nature of Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey journal September 2007
The Sloan Digital Sky Survey: Technical Summary journal September 2000
A Local Hubble Bubble from Type Ia Supernovae? journal August 1998
First-Year Spectroscopy for the Sloan Digital sky Survey-Ii Supernova Survey journal April 2008
Can We Avoid Dark Energy? journal December 2008

Similar Records

THE EFFECT OF PECULIAR VELOCITIES ON SUPERNOVA COSMOLOGY
Journal Article · Tue Nov 01 00:00:00 EDT 2011 · Astrophysical Journal · OSTI ID:1962619
+12 more
RESIDUAL HUBBLE-BUBBLE EFFECTS ON SUPERNOVA COSMOLOGY
Journal Article · Sun Aug 01 00:00:00 EDT 2010 · Astrophysical Journal · OSTI ID:1962619
Systematic corrections to the measured cosmological constant as a result of local inhomogeneity
Journal Article · Mon Oct 15 00:00:00 EDT 2007 · Physical Review. D, Particles Fields · OSTI ID:1962619

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS