2013A&A...560A..90F


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.18CEST02:23:21

2013A&A...560A..90F - Astronomy and Astrophysics, volume 560A, 90-90 (2013/12-1)

Measuring cosmic bulk flows with Type Ia supernovae from the Nearby Supernova Factory.

FEINDT U., KERSCHHAGGL M., KOWALSKI M., ALDERING G., ANTILOGUS P., ARAGON C., BAILEY S., BALTAY C., BONGARD S., BUTON C., CANTO A., CELLIER-HOLZEM F., CHILDRESS M., CHOTARD N., COPIN Y., FAKHOURI H.K., GANGLER E., GUY J., KIM A., NUGENT P., NORDIN J., PAECH K., PAIN R., PECONTAL E., PEREIRA R., PERLMUTTER S., RABINOWITZ D., RIGAULT M., RUNGE K., SAUNDERS C., SCALZO R., SMADJA G., TAO C., THOMAS R.C., WEAVER B.A. and WU C.

Abstract (from CDS):

Our Local Group of galaxies appears to be moving relative to the cosmic microwave background with the source of the peculiar motion still uncertain. While in the past this has been studied mostly using galaxies as distance indicators, the weight of Type Ia supernovae (SNe Ia) has increased recently with the continuously improving statistics of available low-redshift supernovae. We measured the bulk flow in the nearby universe (0.015<z<0.1) using 117 SNe Ia observed by the Nearby Supernova Factory, as well as the Union2 compilation of SN Ia data already in the literature. The bulk flow velocity was determined from SN data binned in redshift shells by including a coherent motion (dipole) in a cosmological fit. Additionally, a method of spatially smoothing the Hubble residuals was used to verify the results of the dipole fit. To constrain the location and mass of a potential mass concentration (e.g., the Shapley supercluster) responsible for the peculiar motion, we fit a Hubble law modified by adding an additional mass concentration. The analysis shows a bulk flow that is consistent with the direction of the CMB dipole up to z∼0.06, thereby doubling the volume over which conventional distance measures are sensitive to a bulk flow. We see no significant turnover behind the center of the Shapley supercluster. A simple attractor model in the proximity of the Shapley supercluster is only marginally consistent with our data, suggesting the need for another, more distant source. In the redshift shell 0.06<z<0.1, we constrain the bulk flow velocity to ≤240km/s (68% confidence level) for the direction of the CMB dipole, in contradiction to recent claims of the existence of a large-amplitude dark flow.

Abstract Copyright:

Journal keyword(s): cosmology: observations - cosmological parameters - large-scale structure of Universe - supernovae: general

Errata: + corrigendum vol. 579, p. C1 (2015)

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 766 0
2 SN 2003ic SN* 00 41 50.23 -09 18 19.0     17.6     SNIa 30 1
3 SN 2005eu SN* 02 27 43.30 +28 10 37.8     17.6     SN.Ia 47 2
4 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5644 0
5 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 957 2
6 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 476 0
7 SN 1993O SN* 13 31 07.87 -33 12 50.5   17.79 17.96     SNIa 65 1
8 ACO 3560 ClG 13 32 23.7 -33 08 21           ~ 117 1
9 NAME Local Void vid 18 38 +18.0           ~ 147 0
10 SN 1995ac SN* 22 45 34.14 -08 45 04.7   17.23 17.10     SN.IaPec 72 2
11 NAME Local Group GrG ~ ~           ~ 6660 0
12 NAME Sloan Great Wall ? ~ ~           ~ 151 0

    Equat.    Gal    SGal    Ecl

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2019.10.18-02:23:21

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