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We search for bright Ly$\rm \alpha$ emitters among Spitzer SMUVS galaxies atz > 2.9 with homogeneous MUSE data. Although it only covers a small region ofCOSMOS, MUSE has the unique advantage of providing spectral information overthe entire field, without the need of target pre-selection. This gives anunbiased detection of all the brightest Ly$\rm \alpha$ emitters among SMUVSsources, which by design are stellar-mass selected galaxies. Within the studiedarea, ~14% of the SMUVS galaxies at z > 2.9 have Ly$\rm \alpha$ fluxes F$\rm_\lambda$ > 7 x 10$^{-18}$ erg s$^{-1}$ cm$^{-2}$. These Ly$\rm \alpha$emitters are characterized by three types of emission, 47% show a single lineprofile, 19% present a double peak or a blue bump and 31% show a red tail. Oneobject (3%) shows both a blue bump and a red tail. We also investigate thespectral energy distribution (SED) properties of the SMUVS MUSE-detectedgalaxies and MUSE non-detections. After stellar-mass matching both populations,we find that MUSE detected galaxies have generally lower extinction thanSMUVS-only objects, while there is no clear intrinsic difference in the massand age distributions. For the MUSE-detected SMUVS galaxies, we compare theinstantaneous SFR lower limit given by Ly$\rm \alpha$ flux with its pastaverage derived from SED fitting, and find evidence for rejuvenation in some ofour oldest objects. We also study the spectra of those Ly$\rm \alpha$ emitterswhich are not detected in SMUVS in the same field. We find differentdistributions of the emission line profiles, which could be ascribed to thefainter Ly$\rm \alpha$ luminosities of the MUSE-only sources and anintrinsically different mass distribution. Finally, we search for the presenceof galaxy associations. MUSE's integral coverage is 20 times more likely tofind associations than all other existing spectral data in COSMOS, biased bytarget pre-selection.

Bright Lyman $\rm \alpha$ emitters among Spitzer SMUVS galaxies in the MUSE/COSMOS field