High-multiplex and deep spectroscopic follow-up of upcoming panoramic deep-imaging surveys like the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), Euclid, and the Nancy Grace Roman Space Telescope is a widely recognized and increasingly urgent necessity. No current or planned facility at a U.S. observatory meets the sensitivity, multiplex, and rapid-response time needed to exploit these future datasets. FOBOS, the Fiber-Optic Broadband Optical Spectrograph, is a high-multiplex (1800 fibers), near-term facility that addresses these spectroscopic needs by optimizing depth over area and exploiting the aperture advantage of the existing 10m Keck II Telescope, providing unique focal-plane sampling modes (single-fiber and IFU MOS) and UV sensitivity (0.31–1.0 μm) at R ∼ 3500. In the era of panoramic deep imaging, FOBOS will excel at building the deep, spectroscopic reference data sets needed to interpret vast imaging data. Below are a few examples of the science we are excited to explore with FOBOS.
Created by Illustris Collaboration
Credit: Lewis et al. 2013, Figure 1, The Astrophysical Journal, Volume 763, Issue 1, article id. 4.