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J/MNRAS/457/3470    SN Ia host-galaxy/cosmological parameters  (Campbell+, 2016)

How SN Ia host-galaxy properties affect cosmological parameters. Campbell H., Fraser M., Gilmore G. <Mon. Not. R. Astron. Soc., 457, 3470-3491 (2016)> =2016MNRAS.457.3470C (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry ; Stars, distances Keywords: supernovae: general - cosmological parameters - dark energy - distance scale Abstract: We present a systematic study of the relationship between Type Ia Supernova (SN Ia) properties, and the characteristics of their host galaxies, using a sample of 581 SNe Ia from the full Sloan Digital Sky Survey II (SDSS-II) SN Survey. We also investigate the effects of this on the cosmological constraints derived from SNe Ia. Compared to previous studies, our sample is larger by a factor of >4, and covers a substantially larger redshift range (up to z∼0.5), which is directly applicable to the volume of cosmological interest. We measure a significant correlation (>5σ) between the host-galaxy stellar-mass and the SN Ia Hubble Residuals (HR). We find a weak correlation (1.4σ) between the host-galaxy metallicity as measured from emission lines in the spectra, and the SN Ia HR. We also find evidence that the slope of the correlation between host-galaxy mass and HR is -0.11mag/log(Mhost/M) steeper in lower metallicity galaxies. We test the effects on a cosmological analysis using both the derived best-fitting correlations between host parameters and HR, and by allowing an additional free parameter in the fit to account for host properties which we then marginalize over when determining cosmological parameters. We see a shift towards more negative values of the equation-of-state parameter w, along with a shift to lower values of Ωm after applying mass or metallicity corrections. The shift in cosmological parameters with host-galaxy stellar-mass correction is consistent with previous studies. We find a best-fitting cosmology of {OMEGA}_m+=0.266±0.016, {OMEGA}{LAMBDA}=0.740±0.018 and w=-1.151+0.123-0.121 (statistical errors only). Description: We have investigated correlations between SNe Ia light curves and their host galaxies and look at the effect on the cosmological constraints. For this we have used the sample of 581 photometrically classified SNe Ia from Campbell et al. (2013, Cat. J/ApJ/763/88). This sample was assembled from three years of photometry from the SDSS-II SN Survey, together with BOSS spectroscopy of the host galaxies of transients. We use the stellar population parameters derived from the BOSS DR10 results (Ahn et al., 2012ApJS..203...21A, Cat V/139) File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablec1.dat 399 564 SNe Ia with host galaxy data
See also: V/139 : SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012) J/ApJ/763/88 : SDSS-II supernovae Ia cosmological analysis (Campbell+, 2013) Byte-by-byte Description of file: tablec1.dat
Bytes Format Units Label Explanations
1- 5 I5 --- SN SN identification number, SDSS-II SN NNNNN in Simbad 7- 14 F8.6 --- zH Host-galaxy redshift 16- 23 E8.4 --- e_zH Host-galaxy redshift error 25- 34 F10.6 deg RAdeg [-43/45] SN right ascension (J2000) 36- 44 F9.6 deg DEdeg [-1.3/1.3] SN declination (J2000) 46- 56 E11.6 mag X0 SN SALT2 parameter X0 58- 68 E11.6 mag e_X0 SN SALT2 parameter X0 error 70- 77 F8.5 mag X1 SN SALT2 parameter X1 79- 85 F7.5 mag e_X1 SN SALT2 parameter X1 error 87- 97 F11.8 mag c SN SALT2 colour ((B-V)max-<B-V>) 99-108 F10.8 mag e_c SN SALT2 colour error 110-120 E11.6 --- C00 SN SALT2 X0 variance 122-133 E12.6 --- C01 SN SALT2 (X0, X1) covariance 135-146 E12.6 --- C02 SN SALT2 X0, colour) covariance 148-157 F10.7 --- C11 SN SALT2 X1 variance 159-168 F10.7 --- C12 SN SALT2 (X1, colour) covariance 170-178 F9.7 --- C22 SN SALT2 colour variance 180-186 F7.4 mag mu SN distance modulus uncorrected for Malmquist bias 188-194 F7.4 mag muc SN distance modulus corrected for Malmquist bias 196-203 F8.6 mag e_muc SN distance modulus error 205-212 F8.5 mag mucos SN best-fitting cosmology estimated distance modulus 214 A1 --- --- [-] 215-221 F7.5 mag e_mucos SN best-fitting cosmology estimated distance modulus error 223-231 F9.6 mag HR SN Hubble Residual from distance modulus uncorrected for Malmquist bias 233-241 F9.6 mag HRc SN Hubble Residual from distance modulus corrected for Malmquist bias 243-250 F8.6 mag e_HRc HR error 252-271 A20 --- Host Host-galaxy ObjID (DR8) 272 A1 --- n_Host [*] * when ObjID from SDSS DR7 274-285 A12 --- TypeH Host-galaxy type 287 A1 --- l_MetH [l] Limit flag on MetH 288-296 F9.7 [-] MetH Host-galaxy metallicity (Z) 298-308 F11.7 [-] e_MetH Host-galaxy metallicity error 310-317 A8 --- n_MetH Host-galaxy metallicity type (measured or upper limit) 319-326 F8.5 [Msun] logMassH Host-galaxy mass 328-334 F7.5 [Msun] e_logMassH Host-galaxy mass error 336 A1 --- l_logSFRH [l] Limit flag on logSFRH 337-347 F11.8 [Msun/yr] logSFRH Host-galaxy SFR 349-356 F8.6 [Msun/yr] e_logSFRH Host-galaxy SFR error 358-362 A5 --- n_logSFRH Host-galaxy SFR type (measured or upper limit) 364-372 F9.5 [yr-1] logsSFRH Host-galaxy sSFR 374-380 F7.5 [yr-1] e_logsSFRH Host-galaxy sSFR error 382-390 F9.6 [Gyr] logAge Host-galaxy age 392-399 F8.6 [Gyr] e_logAge Host-galaxy age error
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Nov-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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