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29 March 2024
 
  » arxiv » 1506.2670

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On the nature of H$alpha$ emitters at $z sim 2$ from the HiZELS survey: physical properties, Ly$alpha$ escape fraction, and main sequence
I. Oteo ; D. Sobral ; R. J. Ivison ; I. Smail ; P. N. Best ; J. Cepa ; A. M Pérez-García ;
Date 8 Jun 2015
AbstractWe present a detailed multi-wavelength study (from rest-frame UV to far-IR) of narrow-band (NB) selected, star-forming (SF) H$alpha$ emitters (HAEs) at $z sim 2.23$ taken from the High Redshift(Z) Emission Line Survey (HiZELS). We find that HAEs have similar SED-derived properties and colors to $sBzK$ galaxies and probe a well-defined portion of the SF population at $z sim 2$. This is not true for Ly$alpha$ emitters (LAEs), which are strongly biased towards blue, less massive galaxies (missing a significant percentage of the SF population). Combining our H$alpha$ observations with matched, existing Ly$alpha$ data we determine that the Ly$alpha$ escape fraction ($f_{ m esc}$) is low (only $sim$ 4.5\% of HAEs show Ly$alpha$ emission) and decreases with increasing dust attenuation, UV continuum slope, stellar mass, and star formation rate (SFR). This suggests that Ly$alpha$ preferentially escapes from blue galaxies with low dust attenuation. However, a small population of red and massive LAEs is also present in agreement with previous works. This indicates that dust and Ly$alpha$ are not mutually exclusive. Using different and completely independent measures of the total SFR we show that the H$alpha$ emission is an excellent tracer of star formation at $z sim 2$ with deviations typically lower than 0.3 dex for individual galaxies. We find that the slope and zero-point of the HAE main-sequence (MS) at $z sim 2$ strongly depend on the dust correction method used to recover SFR, although they are consistent with previous works when similar assumptions are made.
Source arXiv, 1506.2670
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