Plan for flux calibration test of May-June 2022 runs

Make a plan and make a sample list for the flux calibration test during the commissioning runs in May-June 2022. This ticket is to summarize the discussion we had and to specify the plan for the flux calibration test.

Target stars

Because the 2D DRP uses F-type stars as flux standards, we desire an observation of F-type stars in the commissioning runs. The objects to be observed should have reliable spectra but such objects are generally much bright. After discussion on/offline with the DRP team and Moritani-san, the sample now includes a star from CALSPEC and some of the GA target stars. The stars are brighter than ~10 mag, which requires a short exposure of ~10 sec (estimated from the fact that 12 mag stars are saturated in 60-sec exposures according to ETC). We choose GA stars with X-shooter spectra because its wavelength coverage entirely covers PFS.

Candidates for May run

• CALSPEC star: BD+29 2091 (G = 10 mag, RA = 11 h, the first half of the night)
• GA target stars: 34 F-type stars with X-shooter spectra (G = 6-10 mag, RA = 10-22 h, the second half of the night)

Exposure and fibers

In the online talk, Moritani-san agreed that we will have short-exposure observations for the flux calibration test. Our observations cannot share fibers with the distortion test which exposes in 60 sec.

F-type stars, which were selected with broad-band photometry by Ishigaki-san, will be included in FLUXSTD fibers from the targetDB. This observation chance will allow us to check the F-type selection.

We require, at least, 1 object during the commissioning runs.