PRIMUS Figures
The volume and number of redshifts compared among several surveys at z<1. PRIMUS, for the first time, probes the universe to z~1 with a survey comparable to the largest low-redshift datasets. The symbol size scales with the depth of the survey.
PRIMUS low-resolution redshift versus high-resolution redshift from the DEEP2 or VVDS galaxy redshift surveys. Only objects with i<22.5 have been included. The PRIMUS redshift precision is <0.4% with very few outliers.
A 24-minute IMACS prism exposure of a slitmask with ~3000 objects in the COSMOS field. Areas around bright stars are masked to avoid scattered light and photometric catalog errors.
A close up of a small portion of a single exposure. Each object has 4 traces; we drill 2 slits for each object and nod the telescope between them. The other 2 traces are sky. The footprint for one object on the detector is 6.4” x 28”.
Example spectra for an early-type galaxy (top), an emission line galaxy (middle), and a broad-line AGN (bottom). The red and black data correspond to the 2 separate object traces. The spectra have been smoothed in the blue.
Resolution per pixel of the PRIMUS prism as a function of wavelength. Note that the resolution is much higher in the blue than in the red.
