GLACE survey: galaxy activity in ZwCl0024+1652 cluster from strong
  optical emission lines
  Although ZwCl0024+1652 galaxy cluster at $z\sim0.4$ has been thoroughly
analysed, it lacks a comprehensive study of star formation and nuclear activity
of its members. With GaLAxy Cluster Evolution (GLACE) survey, a total of 174
H$\alpha$ emission-line galaxies (ELGs) were detected, most of them having
[NII}]. We reduced and analysed a set of [OIII] and H$\beta$ tunable filter
(TF) observations within GLACE survey. Using H$\alpha$ priors, we identified
[OIII] and H$\beta$ in 35 ($\sim$20%) and 59 ($\sim$34%) sources, respectively,
with 21 of them having both emission lines, and 20 having in addition [NII].
Applying BPT-NII diagnostic diagram, we classified these ELGs into 40%
star-forming (SF), 55% composites, and 5% LINERs. Star formation rate (SFR)
measured through extinction corrected H$\alpha$ fluxes increases with stellar
mass ($\mathrm{M}_{*}$), attaining its peak at
$\mathrm{M}_{*}\sim10^{9.8}\mathrm{M}_\odot$. We observed that the cluster
centre to $\sim$1.3Mpc is devoid of SF galaxies and AGN. Our results suggest
that the star formation efficiency declines as the local density increases in
the cluster medium. Moreover, the SF and AGN fractions drop sharply towards
high-density environments. We observed a strong decline in SF fraction in high
$\mathrm{M}_*$, confirming that star formation is highly suppressed in
high-mass cluster galaxies. Finally, we determined that SFR correlates with
$\mathrm{M}_*$ while specific SFR (sSFR) anti-correlates with $\mathrm{M}_*$,
both for cluster and field. This work shows the importance and strength of TF
observations when studying ELGs in clusters at higher redshifts. We provide
with this paper a catalogue of ELGs with H$\beta$ and/or [OIII] lines in
ZwCl0024+1652 cluster.
