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FOBOS: A Next-Generation Spectroscopic Facility at the W. M. Keck Observatory

Bundy, K. and Westfall, K. and MacDonald, N. and Kupke, R. and Savage, M. and Poppett, C. and Alabi, A. and Becker, G. and Burchett, J. and Capak, P. and Coil, A. and Cooper, M. and Cowley, D. and Deich, W. and Dillon, D. and Edelstein, J. and Guhathakurta, P. and Hennawi, J. and Kassis, M. and Lee, K.-G. and Masters, D. and Miller, T. and Newman, J. and O'Meara, J. and Prochaska, J. X. and Rau, M. and Rhodes, J. and Rich, R. M. and Rockosi, C. and Romanowsky, A. and Schafer, C. and Schlegel, D. and Shapley, A. and Siana, B. and Ting, Y. -S. and Weisz, D. and White, M. and Williams, B. and Wilson, G. and Wilson, M. and Yan, R. (2019) FOBOS: A Next-Generation Spectroscopic Facility at the W. M. Keck Observatory. Astro2020 APC White Paper, . (Unpublished)

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High-multiplex and deep spectroscopic follow-up of upcoming panoramic deep-imaging surveys like LSST, Euclid, and WFIRST 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 near-term fiber-based facility that addresses these spectroscopic needs by optimizing depth over area and exploiting the aperture advantage of the existing 10m Keck II Telescope. The result is an instrument with a uniquely blue-sensitive wavelength range (0.31-1.0 um) at R~3500, high-multiplex (1800 fibers), and a factor 1.7 greater survey speed and order-of-magnitude greater sampling density than Subaru's Prime Focus Spectrograph (PFS). In the era of panoramic deep imaging, FOBOS will excel at building the deep, spectroscopic reference data sets needed to interpret vast imaging data. At the same time, its flexible focal plane, including a mode with 25 deployable integral-field units (IFUs) across a 20 arcmin diameter field, enables an expansive range of scientific investigations. Its key programmatic areas include (1) nested stellar-parameter training sets that enable studies of the Milky Way and M31 halo sub-structure, as well as local group dwarf galaxies, (2) a comprehensive picture of galaxy formation thanks to detailed mapping of the baryonic environment at z~2 and statistical linking of evolving populations to the present day, and (3) dramatic enhancements in cosmological constraints via precise photometric redshifts and determined redshift distributions. In combination with Keck I instrumentation, FOBOS also provides instant access to medium-resolution spectroscopy for transient sources with full coverage from the UV to the K-band.

Item Type:Report or Paper (White Paper)
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URLURL TypeDescription Paper
Bundy, K.0000-0001-9742-3138
Capak, P.0000-0003-3578-6843
Series Name:Astro2020 APC White Paper
Record Number:CaltechAUTHORS:20190813-084320751
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97853
Deposited By: Tony Diaz
Deposited On:13 Aug 2019 18:31
Last Modified:23 Nov 2019 00:11

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