Optical/IR spectroscopy has significant potential for dedicated facilities at the scale of LSST, especially if such a facility can fully survey the southern sky. Spectroscopic observations coordinated with LSST would greatly reduce the uncertainties associated with photometric redshifts, enable the measurements of spectroscopic redshifts of tens of thousands of supernovae and other transients, provide accurate velocity dispersions for galaxy clusters, and offer spectroscopic insight into many other sources measured photometrically by LSST. A facility of appropriate scale could be designed with current technologies to coincide with LSST observations. If designed with a larger upgrade in mind, such a facility could lead to the ultimate spectroscopic survey around the conclusion of LSST’s current program. A facility covering the IR to optical with >50,000 fibers would be capable of producing a galaxy sample of a half billion spectra or more. A dedicated survey of this scale will allow measurements of galaxy clustering to non-linear scales for redshifts z<1.5, measurements of all linear modes to z=3.5, and offer insight into astrophysics at all scales. A roadmap that progressively scales spectroscopic capabilities starting from DESI will need to address challenges in telescope availability, new instrumentation, and theory.
This session will be devoted to talks presenting the scientific and technical potential for large spectroscopic surveys following the completion of DESI. Questions that will be addressed in this section include:
What is the potential for the DESI spectrograph in 2024 and beyond?
What range of spectroscopy is needed to supplement the LSST imaging program in the 2023-2032 timeframe?
What is the appropriate match in timescale, cadence, and sample properties between spectroscopy and LSST imaging?
What potential exists in a dedicated, massively multiplexed spectroscopic facility that could begin at the conclusion of the 10-yr LSST program?
The following schedule will follow a format divided evenly between presentations and open discussion. Each talk is allocated 15 minutes that does include the open discussion. For the sake of time, presentations should be kept to fewer than ten slides and assume that all attendees have been informed of the basic concept of the spectroscopic roadmap.
Zoom Meeting ID: 386 632 578