SIMBAD references

We use the deep NIR imaging of the FIRES survey to investigate trends with redshift of the properties of galaxies selected to have strong Balmer/4000 Å breaks at 2<z<4.5. Analogous to the J-K>1.3 (AB) color criterion designed to select red galaxies at z>2, we propose two color criteria, J-H>0.9 and H-K>0.9, to select red galaxies in two redshift bins at 2<z<3 and 3<z<4.5, respectively. From the FIRES catalogs of the HDF-S (4.7 arcmin²) and MS 1054-03 (26.3 arcmin²) fields, we find 18 galaxies with <z_phot≥2.4 that satisfy J_s-H>0.9, H<23.4 and 23 galaxies with <z_phot≥3.7 that satisfy H-K_s>0.9, K_s<24.6, where the flux limits are chosen to match the limiting rest-frame luminosities at the different median redshifts of the two samples. The space densities of the J_s-H and H-K_ssamples are (1.5±0.5)x10^–4 and (1.2±0.4)x10^–4/Mpc3, respectively. The rest-frame U-B colors of galaxies in both samples are similarly red (as expected from the definition of the color criteria), but the rest-frame UV properties are different: galaxies in the higher redshift H-K_sselected sample have blue NUV-optical colors and UV slopes similar to those of Lyman break galaxies, while the J_s-H galaxies are generally red over the entire wavelength range observed. Synthetic template fits indicate that the distinct rest-NUV properties of the two samples are primarily a result of dust: we find <A_V>_JH=1 mag and <A_V>_HK=0.2 mag. The median stellar mass determined from the template fits decreases by a factor of ∼5 from z=2.4 to 3.7, which, coupled with the fact that the space density of such galaxies remains roughly constant, may imply that the stellar mass density in red galaxies decreases by a similar factor over this redshift range.