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Paper: The Long Faint Tail of the High-redshift Galaxy Population
Volume: 380, At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys
Page: 433
Authors: Sawicki, M.; Iwata, I.; Ohta, K.; Thompson, D.; Tamura, N.; Akiyama, M.; Aoki, K.; Ando, M.; Kiuchi, G.
Abstract: We study the properties of very faint, sub-L* Lyman break galaxies at z~2–5 — thus far a largely neglected but numerically and energetically very important population. We find that the LBG luminosity function undergoes luminosity-dependent evolution: the number of luminous galaxies remains constant while the number of faint ones grows with time. The total UV luminosity density increases with cosmic time from at least z~5 until reaching a peak or a plateau around z~2 — behaviour that is governed by the sub-L* galaxies in the LF’s “faint tail”. Using broadband SED fitting we find a nearly-linear relationship between SFR and galaxy stellar mass at z∼2. A typical L* LBG at z~2 shows a stellar mass of ~1010M, remarkably similar to the bimodality mass at low redshift. This similarity suggests that the mechanisms responsible for the galaxy bimodality at low-z may have also been at play at z~2.
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