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The Backup Program of the Dark Energy Spectroscopic Instrument’s Milky Way Survey

Authors: Arjun Dey, Sergey E. Koposov, Joan R. Najita, Andrew P. Cooper, B. T. Gänsicke, Adam D. Myers, A. Raichoor, Daniel J. Eisenstein, E. F. Schlafly, D. Schlegel, C. Allende Prieto, Leandro Beraldo e Silva, Ting S. Li, M. Valluri, Stéphanie Juneau, Mika Lambert, S. Li, Guillaume F. Thomas, Wenting Wang, Alexander H. Riley, N. Kizhuprakkat, J. Aguilar, S. Ahlen, S. Bailey, D. Bianchi, D. Brooks, T. Claybaugh, A. Cuceu, A. de la Macorra, J. Della Costa, Biprateep Dey, P. Doel, A. Font-Ribera, J. E. Forero-Romero, E. Gaztañaga, S. Gontcho A Gontcho, G. Gutierrez, J. Guy, C. Hahn, K. Honscheid, M. Ishak, J. Jimenez, R. Kehoe, D. Kirkby, T. Kisner, A. Kremin, C. Lamman, M. Landriau, L. Le Guillou, M. E. Levi, M. Manera, P. Martini, A. Meisner, R. Miquel, J. Moustakas, S. Nadathur, N. Palanque-Delabrouille, W. J. Percival, I. Pérez-Ràfols, F. Prada, G. Rossi, E. Sanchez, M. Schubnell, J. Silber, D. Sprayberry, G. Tarlé, B. A. Weaver, R. H. Wechsler, R. Zhou, H. Zou

Arjun Dey et al 2026 The Astronomical Journal 171 .

Provider: AAS Journals

Caption: Figure 9.

Left panel: Formal radial velocity uncertainties as a function of Gaia G magnitude and (BP − RP) color. The colorbar shows ﹩{{\rm{log}}}_{10}({\sigma }_{RV}/[1\,{\rm{km}}\,{{\rm{s}}}^{-1}]),﹩ and lines show contours of constant radial velocity uncertainty of 0.1,1 and 10 km s⁻¹ (dark blue, light blue, and yellow respectively). Right panel: Median SNR per pixel in the R-arm of the spectrograph as a function of Gaia color and magnitude. The solid lines show contours corresponding to SNR = 10 (blue) and SNR = 100 (yellow). The dotted lines show the same SNR contours but for the bright-time MWS.

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