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We have conducted a two-layered spectroscopic survey (1'x1' ultra deep and3'x3' deep regions) in the Hubble Ultra Deep Field (HUDF) with the Multi UnitSpectroscopic Explorer (MUSE). The combination of a large field of view, highsensitivity, and wide wavelength coverage provides an order of magnitudeimprovement in spectroscopically confirmed redshifts in the HUDF; i.e., 1206secure spectroscopic redshifts for HST continuum selected objects, whichcorresponds to 15% of the total (7904). The redshift distribution extends wellbeyond z>3 and to HST/F775W magnitudes as faint as ~30 mag (AB, 1-sigma). Inaddition, 132 secure redshifts were obtained for sources with no HSTcounterparts that were discovered in the MUSE data cubes by a blind search foremission-line features. In total, we present 1338 high quality redshifts, whichis a factor of eight increase compared with the previously known spectroscopicredshifts in the same field. We assessed redshifts mainly with the spectralfeatures [OII] at z<1.5 (473 objects) and Lya at 2.9<z<6.7 (692 objects). Withrespect to F775W magnitude, a 50% completeness is reached at 26.5 mag for ultradeep and 25.5 mag for deep fields, and the completeness remains >~20% up to28-29 mag and ~27 mag, respectively. We used the determined redshifts to testcontinuum color selection (dropout) diagrams of high-z galaxies. The selectioncondition for F336W dropouts successfully captures ~80% of the targeted z~2.7galaxies. However, for higher redshift selections (F435W, F606W, and F775Wdropouts), the success rates decrease to ~20-40%. We empirically redefine theselection boundaries to make an attempt to improve them to ~60%. The revisedboundaries allow bluer colors that capture Lya emitters with high Lyaequivalent widths falling in the broadbands used for the color-color selection.Along with this paper, we release the redshift and line flux catalog.

The MUSE Hubble Ultra Deep Field Survey: II. Spectroscopic redshifts and comparisons to color selections of high-redshift galaxies