The MUSE <i>Hubble</i> Ultra Deep Field surveys: Data release II

We present the second data release of MUSE Hubble Ultra-Deep Field surveys, which includes deepest spectroscopic survey ever performed. The data, with their 3D content, amazing depth, wide spectral range, and excellent spatial medium resolution, are rich in information. Their location ultra-deep field area, benefits from an exquisite collection ancillary panchromatic information, is a major asset. This update first incorporates new 141-h adaptive-optics-assisted eXtremely Deep (MXDF; 1 arcmin diameter view) addition to reprocessed 10-h mosaic (3 × 3 2 ) single 31-h deep (1 ). All three sets were processed analyzed homogeneously using advanced reduction analysis methods. σ point-source flux limit unresolved emission line reaches 3.1 10 −19 6.3 −20 erg s −1 cm −2 at 10- depths, respectively. have securely identified measured redshift 2221 sources, increase 41% compared release. With exception eight stars, collected sample consists 25 nearby galaxies ( z &lt; 0.25), 677 [O II ] emitters = 0.25 − 1.5), 201 desert range 1.5 2.8), 1308 Ly α 2.8 6.7). represents order magnitude more redshifts than all obtained before area (i.e., versus 292). At high &gt; 3), difference even striking, factor 65 (1308 20). against published photometric catalogs find photo-z accuracy be lower constraints provided by fitting codes. Eighty percent our final catalog HST counterpart. These on average faint, median AB F 775 W 25.7 28.7 for emitters, Fits energy distribution show that these tend low-mass star-forming galaxies, stellar mass 6.2 8 M ⊙ star-formation rate 0.4 yr . completeness respect found that, 50% achieved 27.6 0.8 1.6 3.2 4.5, Twenty catalog, or 424 no vast majority sources equivalent-width detected thanks bright asymmetric broad line. products, specific software, web interface select download sets.