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We have obtained deep NIR narrow and broad (J and Y) band imaging data of theGOODS-South field. The narrow band filter is centered at 1060 nm correspondingto redshifts $z = 0.62, 1.15, 1.85$ for the strong emission lines H$\alpha$,$[$OIII$]$/H$\beta$ and $[$OII$]$, respectively. From those data we extract awell defined sample ($M(AB)=24.8$ in the narrow band) of objects with largeemission line equivalent widths in the narrow band. Via SED fits to publishedbroad band data we identify which of the three lines we have detected andassign redshifts accordingly. This results in a well defined, strong emissionline selected sample of galaxies down to lower masses than can easily beobtained with only continuum flux limited selection techniques. We compare the(SED fitting-derived) main sequence of star-formation (MS) of our sample toprevious works and find that it has a steeper slope than that of samples ofmore massive galaxies. We conclude that the MS steepens at lower (below$M_{\star} = 10^{9.4} M_{\odot}$) galaxy masses. We also show that the SFR atany redshift is higher in our sample. We attribute this to the targetedselection of galaxies with large emission line equivalent widths, and concludethat our sample presumably forms the upper boundary of the MS. We brieflyinvestigate and outline how samples with accurate redshifts down to those lowstellar masses open a new window to study the formation of large scalestructure in the early universe. In particular we report on the detection of ayoung galaxy cluster at $z=1.85$ which features a central massive galaxy whichis the candidate of an early stage cD galaxy, and we identify a likely filamentmapped out by $[$OIII$]$ and $H\beta$ emitting galaxies at $z=1.15$.

Emission line selected galaxies at $z=0.6-2$ in GOODS South: Stellar masses, SFRs, and large scale structure