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 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 2012ApJS..203...21A, Cat V/139)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 399 564 SNe Ia with host galaxy data
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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
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Bytes Format Units Label Explanations
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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
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Nov-2016