FIR measurements of Ly-$\alpha$ emitters at z$\lesssim$1.0: dust attenuation from PACS-\emph{Herschel}
One remaining open question regarding the physical properties of
Ly$\alpha$ emitters (LAEs) is their dust content and its evolution with
redshift. The variety of results is large and with those reported by now
is difficult to establish clear relations between dust, other
fundamental parameters of galaxies (star-formation rate, metallicity or
age) and redshift. In this Letter, we report \emph{Herschel}
PACS-100$\mu$m, PACS-160$\mu$m and \emph{Spitzer} MIPS-24$\mu$m
detections of a sample of spectroscopically GALEX-selected LAEs at
z$\sim$0.3 and $\sim$1.0. Five out of ten and one out of two LAEs are
detected in, at least, one PACS band at z$\sim$0.3 and $\sim$1.0,
respectively. These measurements have a great importance given that they
allow us to quantify, for the first time, the dust content of LAEs from
direct FIR observations. MIPS-24$\mu$m detections allow us to determine
IR properties of the PACS-undetected LAEs. We obtain that mid-IR/FIR
detected star-forming (SF) LAEs at z$\sim$0.3 have dust content within
0.75$\lesssim$ $A_{1200\AA}$ $\lesssim$2.0, with a median value of
A${1200\textrm{\AA}}$$\sim$1.1. This range broadens out to
0.75$\lesssim$ $A_{1200\AA}$ $\lesssim$2.5 when considering those LAEs
at z$\sim$1.0. Only one SF LAE is undetected both in MIPS-24$\mu$m and
PACS, with $A{1200\AA}$ $\lesssim$0.75. These results seem to be larger
than those reported for high-redshift LAEs and, therefore, although an
evolutionary trend is not clearly seen, it could point out that
low-redshift LAEs are dustier than high-redshift ones. However, the
diverse methods used could introduce a systematic offset in the results.