Low-frequency radio study of MACS clusters at 610 and 235 MHz using the GMRT. (arXiv:1903.06799v2 [astro-ph.HE] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Paul_S/0/1/0/all/0/1">Surajit Paul</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Salunkhe_S/0/1/0/all/0/1">Sameer Salunkhe</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Datta_A/0/1/0/all/0/1">Abhirup Datta</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Intema_H/0/1/0/all/0/1">Huib T. Intema</a>
Studies have shown that mergers of massive galaxy clusters produce shocks and
turbulence in the intra-cluster medium, the possible event that creates radio
relics, as well as the radio halos. Here we present GMRT dual-band (235 and
610~MHz) radio observations of four such clusters from the MAssive Cluster
Survey (MACS) catalogue. We report the discovery of a very faint, diffuse,
elongated radio source with a projected size of about 0.5~Mpc in cluster
MACSJ0152.5-2852. We also confirm the presence of a radio relic-like source
(about 0.4~Mpc, previously reported at 325~MHz) in MACSJ0025.4-1222 cluster.
Proposed relics in both these clusters are found apparently inside the virial
radius instead of their usual peripheral location, while no radio halos are
detected. These high-redshift clusters ($z=0.584$ and $0.413$) are among the
earliest merging systems detected with cluster radio emissions. In
MACSJ1931-2635 cluster, we found a radio mini-halo and an interesting highly
bent pair of radio jets. Further, we present here a maiden study of low
frequency (GMRT $235;&;610$~MHz) spectral and morphological signatures of a
previously known radio cluster MACSJ0014.3-3022 (Abell~2744). This cluster
hosts a relatively flat spectrum ($alpha^{610}_{235}sim -1.15$), giant ($sim
1.6$~Mpc each) halo-relic structure and a close-by high-speed
($1769pm^{148}_{359}$~km~s$^{-1}$) merger-shock
($mathcal{M}=2.02pm^{0.17}_{0.41}$) originated from a possible second merger
in the cluster.
Studies have shown that mergers of massive galaxy clusters produce shocks and
turbulence in the intra-cluster medium, the possible event that creates radio
relics, as well as the radio halos. Here we present GMRT dual-band (235 and
610~MHz) radio observations of four such clusters from the MAssive Cluster
Survey (MACS) catalogue. We report the discovery of a very faint, diffuse,
elongated radio source with a projected size of about 0.5~Mpc in cluster
MACSJ0152.5-2852. We also confirm the presence of a radio relic-like source
(about 0.4~Mpc, previously reported at 325~MHz) in MACSJ0025.4-1222 cluster.
Proposed relics in both these clusters are found apparently inside the virial
radius instead of their usual peripheral location, while no radio halos are
detected. These high-redshift clusters ($z=0.584$ and $0.413$) are among the
earliest merging systems detected with cluster radio emissions. In
MACSJ1931-2635 cluster, we found a radio mini-halo and an interesting highly
bent pair of radio jets. Further, we present here a maiden study of low
frequency (GMRT $235;&;610$~MHz) spectral and morphological signatures of a
previously known radio cluster MACSJ0014.3-3022 (Abell~2744). This cluster
hosts a relatively flat spectrum ($alpha^{610}_{235}sim -1.15$), giant ($sim
1.6$~Mpc each) halo-relic structure and a close-by high-speed
($1769pm^{148}_{359}$~km~s$^{-1}$) merger-shock
($mathcal{M}=2.02pm^{0.17}_{0.41}$) originated from a possible second merger
in the cluster.
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