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29 March 2024 |
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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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