J/A+A/568/A22 Joint analysis of the SDSS-II and SNLS SNe Ia (Betoule+, 2014)
Improved cosmological constraints from a joint analysis of the SDSS-II
and SNLS supernova samples.
Betoule M., Kessler R., Guy J., Mosher J., Hardin D., Biswas R., Astier P.,
El-Hage P., Konig M., Kuhlmann S., Marriner J., Pain R., Regnault N.,
Balland C., Bassett B.A., Brown P.J., Campbell H., Carlberg R.G.,
Cellier-Holzem F., Cinabro D., Conley A., D'Andrea C.B., DePoy D.L., Doi M.,
Ellis R.S., Fabbro S., Filippenko A.V., Foley R.J., Frieman J.A.,
Fouchez D., Galbany L., Goobar A., Gupta R.R., Hill G.J., Hlozek R.,
Hogan C.J., Hook I.M., Howell D.A., Jha S.W., Le Guillou L., Leloudas G.,
Lidman C., Marshall J.L., Moller A., Mourao A.M., Neveu J., Nichol R.,
Olmstead M.D., Palanque-Delabrouille N., Perlmutter S., Prieto J.L.,
Pritchet C.J., Richmond M., Riess A.G., Ruhlmann-Kleider V., Sako M.,
Schahmaneche K., Schneider D.P., Smith M., Sollerman J., Sullivan M.,
Walton N.A., Wheeler C.J.
<Astron. Astrophys. 568, A22 (2014)>
=2014A&A...568A..22B 2014A&A...568A..22B
ADC_Keywords: Supernovae ; Redshifts ; Photometry
Keywords: cosmology: observations - distance scale - dark energy
Abstract:
We deliver luminosity-distance measurements from a joint analysis of
740 type-Ia supernovae from the SDSS and SNLS supernova surveys.
Description:
The release consists in:
1. The light-curve parameters for the 740 SNe Ia, obtained from a fit
of the measured light-curve with the SALT2 v2.4 light-curve model.
(tablef3.dat)
2. The covariance matrix of the light-curve parameter uncertainties,
including both the statistical and the systematic uncertainty. The
ordering of parameters in the file is mb, x1 and color for the
first SN, then mb, x1 and color for the second, etc.
(tablef3.fit)
3. Distance moduli obtained from a fit to the Light-curve parameters,
as described in Appendix E of the paper (tablef1.dat)
4. The covariance matrix of fitted distance moduli, including both
statistical and systematic contribution (tablef2.fit)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablef1.dat 19 31 Binned distance moduli
tablef2.fit 2880 4 Binned distance moduli (31x31) covariance matrix
tablef3.dat 193 740 Supernovae light-curve parameters
tablef4.fit 2880 13691 Light-curve parameter systematic (2220x2220)
covariance matrix
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See also:
J/A+A/552/A124 : SNLS & SDSS SN surveys photometric calibration (Betoule+ 2013)
Byte-by-byte Description of file: tablef1.dat
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Bytes Format Units Label Explanations
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1- 5 F5.3 --- z [0.01/1.3] Redshift of the node
10- 19 F10.7 mag mu [32.9/44.9] Interpolated distance (1)
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Note (1): The overall normalization of the distance moduli is arbitrary. See
Appendix E for the exact meaning of these values and their usage in cosmology.
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Byte-by-byte Description of file: tablef3.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Supernovae name
13- 21 F9.7 --- zcmb [0,1.4] CMB frame redshift (1)
22- 30 F9.7 --- zhel [0,1.4] Heliocentric redshift
31 I1 --- e_z [0] Error in redshift (2)
32- 41 F10.7 mag mb B band peak magnitude mB (3)
42- 50 F9.7 mag e_mb Error in mb (4)
51- 60 F10.7 --- x1 SALT2 shape (stretch) parameter x1
61- 69 F9.7 --- e_x1 Error in x1
70- 79 F10.7 --- c SALT2 color parameter c
80- 88 F9.7 --- e_c Error in color
89- 98 F10.7 [Msun] logMst log10 host stellar mass
99-108 F10.7 [Msun] e_logMst Error in logMst
109-121 F13.7 d tmax MJD corresponding to of peak brightness
122-130 F9.7 d e_tmax Error in tmax
131-140 F10.7 --- cov(mb,s) The covariance between mb and x1
141-150 F10.7 --- cov(mb,c) The covariance between mb and colour
151-160 F10.7 --- cov(s,c) The covariance between x1 and colour
161 I1 --- set [1,4] Supernova sample identifier (5)
162-172 F11.7 deg RAdeg Right Ascension in degree (J2000)
173-183 F11.7 deg DEdeg Declination in degree (J2000)
184-193 F10.7 mag bias The correction for analysis bias
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Note (1): The analysis includes a correction for the peculiar motions of nearby
supernova based on the models of M.J. Hudson taken from the original low-z
compilation (Conley et al. 2011ApJS..192....1C 2011ApJS..192....1C, Cat. J/ApJS/192/1).
Note (2): The analysis assumes a constant redshift uncertainty dominated by
peculiar velocities of 150km/s rms, treated as an uncertainty on magnitudes.
Note (3): The distance modulus for a particular SN Ia in the SALT2 model is
given by µ=mB-(MB-αx1+βc), where x1 (time stretching
parameter), c (color), and mB (oberved peak magnitude in rest-frame B)
are obtained by fitting its light curve. The reported mb values are corrected
for selection bias given in column "bias".
Note (4): The reported error includes contributions from redshift
uncertainties, intrinsic SNe dispersion and lensing.
Note (5): Supernova sample identifiers as follows:
1 = SNLS (Supernova Legacy Survey)
2 = SDSS (Sloan Digital Sky Survey: SDSS-II SN Ia sample)
3 = lowz (from CfA; Hicken et al. 2009, J/ApJ/700/331
4 = Riess HST (2007ApJ...659...98R 2007ApJ...659...98R)
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Acknowledgements:
Marc Betoule, marc.betoule(at)lpnhe.in2p3.fr
(End) Marc Betoule [LPNHE, France], Patricia Vannier [CDS] 03-Jun-2014