ASKAP reveals the radio tail structure of the Corkscrew Galaxy shaped by its passage through the Abell 3627 cluster
arxiv(2024)
摘要
Among the bent tail radio galaxies common in galaxy clusters are some with
long, collimated tails (so-called head-tail galaxies) shaped by their
interactions with the intracluster medium (ICM). Here we report the discovery
of intricate filamentary structure in and beyond the 28' (570 kpc) long,
helical radio tail of the Corkscrew Galaxy (1610-60.5, ESO137-G007), which
resides in the X-ray bright cluster Abell 3627 (D = 70 Mpc). Deep radio
continuum data were obtained with wide-field Phased Array Feeds on the
Australian Square Kilometer Array Pathfinder (ASKAP) at 944 MHz and 1.4 GHz.
The Corkscrew Galaxy is located 15' north of the prominent wide-angle tail
(WAT) radio galaxy 1610-60.8 (ESO137-G006) near the cluster centre. While the
bright (young) part of its radio tail is highly collimated, the faint (old)
part shows increasing oscillation amplitudes, break-ups, and filaments. We find
a stunning set of arc-shaped radio filaments beyond and mostly orthogonal to
the collimated Corkscrew tail end, forming a partial bubble. This may be the
first detection of a "proto-lobe" seen in 3D MHD simulations by Nolting et al.
(2019), formed by the face-on impact of the Corkscrew Galaxy with a shock front
in the cluster outskirts. Interactions of the radio galaxy tail with the ICM
are likely responsible for the tail collimation and shear forces within the ICM
for its increasingly filamentary structure. We also report the discovery of
small ( 20-30 kpc) ram-pressure stripped radio tails in four Abell 3627 cluster
galaxies.
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