Abstract
ABSTRACT The new generation of wide-field time-domain surveys has made it feasible to study the clustering of supernova (SN) host galaxies in the large-scale structure (LSS) for the first time. We investigate the LSS environment of SN populations, using 106 dark matter density realisations with a resolution of ∼3.8 Mpc, constrained by the 2M+ + galaxy survey. We limit our analysis to redshift z < 0.036, using samples of 498 thermonuclear and 782 core-collapse SNe from the Zwicky Transient Facility’s Bright Transient Survey and Census of the Local Universe catalogues. We detect clustering of SNe with high significance; the observed clustering of the two SNe populations is consistent with each other. Further, the clustering of SN hosts is consistent with that of the Sloan Digital Sky Survey (SDSS) Baryon Oscillation Spectroscopic Survey DR12 spectroscopic galaxy sample in the same redshift range. Using a tidal shear classifier, we classify the LSS into voids, sheets, filaments, and knots. We find that both SNe and SDSS galaxies are predominantly found in sheets and filaments. SNe are significantly under-represented in voids and over-represented in knots compared to the volume fraction in these structures. This work opens the potential for using forthcoming wide-field deep SN surveys as a complementary LSS probe.
Highlights
The large-scale structure (LSS) of the Universe forms a web-like pattern which consists of galaxies and intergalactic gas thought to trace a scaffolding of dark matter (White & Rees 1978; Bond, Kofman & Pogosyan 1996)
We present the cosmic web type posterior distributions for SNe Type Ia (SNeIa) and corecollapse SNe (CCSNe) compared with the Sloan Digital Sky Survey (SDSS) galaxy sample
We found with high significance that SNeIa and CCSNe are clustered, with the level of clustering being similar for both SN types
Summary
The large-scale structure (LSS) of the Universe forms a web-like pattern which consists of galaxies and intergalactic gas thought to trace a scaffolding of dark matter (White & Rees 1978; Bond, Kofman & Pogosyan 1996). Structures within this cosmic web can be classified into voids, filaments, sheets, and knots. Voids are regions with density lower than the cosmic mean, from which matter flows on to denser structures; sheets can be described as the boundaries of voids. Old galaxies have been found to reside in dense LSSs, whereas young, star-forming galaxies have been
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