Kavli Affiliate: Richard Kessler
| First 5 Authors: Brodie Popovic, Daniel Scolnic, Maria Vincenzi, Mark Sullivan, Dillon Brout
| Summary:
Future constraints of cosmological parameters from Type Ia supernovae (SNe
Ia) will depend on the use of photometric samples, those samples without
spectroscopic measurements of the SNe Ia. There is a growing number of analyses
that show that photometric samples can be utilised for precision cosmological
studies with minimal systematic uncertainties. To investigate this claim, we
perform the first analysis that combines two separate photometric samples, SDSS
and Pan-STARRS, without including a low-redshift anchor. We evaluate the
consistency of the cosmological parameters from these two samples and find they
are consistent with each other to under $1sigma$. From the combined sample,
named Amalgame, we measure $Omega_M = 0.328 pm 0.024$ with SN alone in a flat
$Lambda$CDM model, and $Omega_M = 0.330 pm 0.018$ and $w =
-1.016^{+0.055}_{-0.058}$ when combining with a Planck data prior and a flat
$w$CDM model. These results are consistent with constraints from the Pantheon+
analysis of only spectroscopically confirmed SNe Ia, and show that there are no
significant impediments to analyses of purely photometric samples of SNe Ia.
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