J/ApJ/812/31 Local Star Formation effects on type Ia SNe (Jones+, 2015)
Reconsidering the effects of local star formation on type Ia supernova
cosmology.
Jones D.O., Riess A.G., Scolnic D.M.
<Astrophys. J., 812, 31 (2015)>
=2015ApJ...812...31J 2015ApJ...812...31J (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, ultraviolet ; Redshifts ; Supernovae ; Magnitudes
Keywords: cosmology: observations; distance scale
Abstract:
Recent studies found a correlation with ∼3σ significance between
the local star formation measured by GALEX in SN Ia host galaxies and
the distances or dispersions derived from these SNe. We search for
these effects by using data from recent cosmological analyses to
greatly increase the SN Ia sample; we include 179 GALEX-imaged SN Ia
hosts with distances from the Joint Light-curve Analysis (JLA) and
Pan-STARRS SN Ia cosmology samples and 157 GALEX-imaged SN Ia hosts
with distances from the Riess et al. (2011, J/ApJ/730/119)
H0 measurement. We find little evidence that SNe Ia in locally
star-forming environments are fainter after light curve correction
than SNe Ia in locally passive environments. We find a difference of
0.000±0.018 (stat+sys) mag for SNe fit with SALT2 and
0.029±0.027 (stat+sys) mag for SNe fit with MLCS2k2 (RV=2.5),
which suggests that proposed changes to recent measurements of H0
and w are not significant and numerically smaller than the parameter
measurement uncertainties. We measure systematic uncertainties of
∼0.01-0.02mag by performing several plausible variants of our
analysis. We find the greatly reduced significance of these distance
modulus differences compared to Rigault et al. (2013A&A...560A..66R 2013A&A...560A..66R)
results from two improvements with fairly equal effects, our larger
sample size and the use of the JLA and Riess et al. sample selection
criteria. Without these improvements, we recover the results of
Rigault et al. We find that both populations have similar dispersions
in distance than found by Rigault et al. and Kelly et al.
(2015Sci...347.1459K 2015Sci...347.1459K), with slightly smaller dispersions for locally
passive (log(ΣSFR)←2.9dex) SNe Ia fit with MLCS, the opposite
of the effect seen by Rigault et al. and Kelly et al. We caution that
measuring the local environments of SNe Ia in the future may require a
higher resolution instrument than GALEX and that SN Ia sample
selection has a significant effect on local star formation biases.
Description:
We used two samples of SNe for this analysis, one from the R11 (Riess
et al. 2011, J/ApJ/730/119) measurement of H0 and the other from the
dark energy equation of state measurements of B14 (Betoule et al.
2014, J/A+A/568/A22) and Pan-STARRS (PS1; Rest et al. 2014,
J/ApJ/795/44; Scolnic et al. 2014ApJ...795...45S 2014ApJ...795...45S, D. M. Scolnic et al.
2015, in preparation). These two samples rely on many of the same SNe,
but R11 use the MLCS light curve fitter to perform their baseline
analysis while B14 and PS1 use SALT2 (Guy et al. 2010, J/A+A/523/A7;
version 2.4).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 135 336 *The LSF step sample
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Note on table3.dat: Rigault et al. (2015ApJ...802...20R 2015ApJ...802...20R) found a mean difference
in Hubble residuals between SNe Iaε and Iaα (hereafter referred
to as the LSF step) of ∼0.09-0.17mag at 2-4σ significance with different
light curve fitters. See section 1.
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See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
J/A+A/578/A8 : Multi-resolution images of M33 (Boquien+, 2015)
J/ApJ/795/44 : PS1 SNe Ia (0.02<z<0.7) griz light curves (Rest+, 2014)
J/A+A/568/A22 : Joint analysis of the SDSS-II and SNLS SNe Ia (Betoule+, 2014)
J/MNRAS/435/1680 : SN Ia host galaxy properties (Johansson+, 2013)
J/ApJS/200/12 : CfA4: light curves for 94 type Ia SNe (Hicken+, 2012)
J/AJ/142/156 : The CSP (DR2): photometry of SNe Ia (Stritzinger+, 2011)
J/MNRAS/412/1441 : SNe luminosity functions (Li+, 2011)
J/ApJ/730/119 : HST/WFC3 obs. of Cepheids in SN Ia hosts (Riess+, 2011)
J/ApJS/192/1 : Light-curve parameters from the SNLS (Conley+, 2011)
J/A+A/523/A7 : Light curves of type Ia supernovae in SNLS (Guy+, 2010)
J/ApJS/190/418 : Light curves for 165 SNe (Ganeshalingam+, 2010)
J/ApJ/722/566 : Host galaxies of SNe Ia in SDSS-II SN survey (Lampeitl+, 2010)
J/MNRAS/406/782 : Type Ia supernovae luminosities (Sullivan+, 2010)
J/ApJ/707/1449 : Local hosts of SNe Ia (Neill+, 2009)
J/ApJS/185/32 : First-year SDSS-II SN results (Kessler+, 2009)
J/ApJ/700/1097 : Light curve parameters of SN Ia (Hicken+, 2009)
J/ApJ/700/331 : Light curves of type Ia supernovae (CfA3) (Hicken+, 2009)
J/ApJ/659/122 : Improved distances to type Ia supernovae (Jha+, 2007)
J/AJ/131/527 : UBVRI light curves of 44 type Ia supernovae (Jha+, 2006)
J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Source identifier
9- 13 A5 --- Survey Survey identifier (1)
15- 19 F5.3 --- zCBM [0.01/0.1] Redshift in the CMB frame
21- 26 F6.3 mag DBmag [-0.6/0.7]? Residual SALT2 shape- &
color- corrected B band magnitude (2)
28- 32 F5.3 mag e_DBmag [0.1/0.5]? Uncertainty in delBmag
34- 39 F6.3 mag DBmag2 ? Residual MLCS shape- & color-
corrected B band magnitude
using RV=2.0 (3)
41- 45 F5.3 mag e_DBmag2 ? Uncertainty in delBmag2
47- 52 F6.3 mag DBmag2.5 ? Residual MLCS shape- & color-
corrected B band magnitude
using RV=2.5 (3)
54- 58 F5.3 mag e_DBmag2.5 ? Uncertainty in delBmag2.5
60- 65 F6.3 mag DBmag3.1 ? Residual MLCS shape- & color-
corrected B band magnitude
using RV=3.1 (3)
67- 71 F5.3 mag e_DBmag3.1 ? Uncertainty in delBmag3.1
73- 77 I5 s Exp ? GALEX FUV band exposure time
79 A1 --- l_FUVmag Limit flag on FUVmag
81- 85 F5.2 mag FUVmag [18/29]? GALEX FUV band magnitude
87- 91 F5.2 mag e_FUVmag [0.01/79]? Uncertainty in FUVmag
93- 95 A3 --- Class Global host class (SF=star-forming;
Pa=passive)
97-101 F5.2 --- R [0.2/35]? SN separation from
host galaxy (4)
103 A1 --- f_R [*] Flag on R (5)
105 A1 --- Dust Dust correction applied; Y|N
107 A1 --- l_logSFR Limit flag on logSFR
109-114 F6.3 [Msun/kpc2/yr] logSFR [-4.9/-1.1]? Log local star formation
rate density
116-120 F5.3 [Msun/kpc2/yr] E_logSFR ? Upper uncertainty in logSFR
122-126 F5.3 [Msun/kpc2/yr] e_logSFR ? Lower uncertainty in logSFR
128-130 I3 % P ? Probability that SN Ia has a
locally passive environment
132-135 A4 --- Cuts Any cuts applied to the SN (6)
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Note (1): Survey as follows:
JRK07 = Jha et al. (2007, J/ApJ/659/122) sample, which includes SNe from
the CfA1, CfA2, and Calan/Tololo SN surveys
(Hamuy et al. 1996AJ....112.2398H 1996AJ....112.2398H; Riess et al. 1999AJ....117..707R 1999AJ....117..707R;
Jha et al. 2006, J/AJ/131/527).
CFA3 = CfA3 sample of Hicken+, 2009, J/ApJ/700/1097
CFA4 = CfA4 SNe from Hicken+, 2012, J/ApJS/200/12
PS1 = PS1 SNe from Rest et al. (2014, J/ApJ/795/44), and the upcoming
4-year PS1 cosmological analysis (12 SNe after sample cuts;
D. M. Scolnic et al. 2015, in preparation)
CSP = Carnegie Supernova Project (Hamuy et al. 2006PASP..118....2H 2006PASP..118....2H;
Stritzinger et al. 2011, J/AJ/142/156)
SDSS = SDSS-II SNe from Kessler+, J/ApJS/185/32
Note (2): JLA + PS1 SALT2.
Note (3): Riess et al. (2011, J/ApJ/730/119) MLCS2k2.
Note (4): Normalized by the SExtractor-measured host galaxy size
(Sullivan et al. 2006ApJ...648..868S 2006ApJ...648..868S). We did note apply a
local dust correction for SNe with R>3, as these are outside the
isophotal radius of the host.
Note (5):
* = Visual inspection found that these SNe Ia were within the isophotal
radius of their host. A dust correction was applied.
Note (6): Cut applied to the SN as follows:
Incl = SN in an inclined host;
UV = SN has no GALEX images;
FOV = GALEX images where the SN position is >0.55 degrees from
the field center;
SFR = Morphologically ambiguous SN.
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Acknowledgments:
David Jones [Johns Hopkins University] for PS1 supernovae coordinates
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 01-Feb-2016