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We present spectroscopic data for 16369 stellar targets within and/or toward38 dwarf spheroidal galaxies and faint star clusters within the Milky Way haloenvironment. All spectra come from observations with the multi-object,fiber-fed echelle spectrographs M2FS at the Magellan/Clay telescope orHectochelle at the MMT, reaching a typical limiting magnitude G < 21. Dataproducts include processed spectra from all observations and catalogs listingestimates -- derived from template model fitting -- of line-of-sight velocity(median uncertainty 1.1 km/s) effective temperature (234 K), (base10 logarithmof) surface gravity (0.52 dex in cgs units), [Fe/H] (0.38 dex) and [Mg/Fe](0.24 dex) abundance ratios. The sample contains multi-epoch measurements for3720 sources, with up to 15 epochs per source, enabling studies of intrinsicspectroscopic variability. The sample contains 6078 likely red giant stars(based on surface gravity), and 4494 likely members (based on line-of-sightvelocity and Gaia-measured proper motion) of the target systems. The number ofmember stars per individual target system ranges from a few, for the faintestsystems, to ~ 850 for the most luminous. For most systems, our new samplesextend over wider fields than have previously been observed; of the likelymembers in our samples, 823 lie beyond twice the projected halflight radius oftheir host system, and 42 lie beyond 5 Rhalf.

Magellan/M2FS and MMT/Hectochelle Spectroscopy of Dwarf Galaxies and Faint Star Clusters within the Galactic Halo