Redshifts

This table stores the numbers of the simulation snapshots along with the corresponding redshift and expansion factor of the universe.

Column Type UCD Unit Description
snapnum int time.epoch snapshot number (in full snapshot sample)
aexp float time.epoch expansion factor of the universe
zred float time.epoch corresponding redshift

Notes

In principle, one can easily convert between redshift and expansion factor via the equation:

aexp = 1/(1+zred). 

However, due to rounding-errors, the result can be slightly different from what is given in the table. We therefore provide both columns for convenience.

Example

SELECT DISTINCT * FROM MDR1.Redshifts ORDER BY snapnum DESC

This query selects the complete redshifts-table. We use the DISTINCT keyword here since this small table is replicated on each node and we want to avoid duplicate results.
For getting to know which redshifts/snapshots are available e.g. in the FOF-table, have a look at the AvailHalos table for the corresponding simulation.

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