Astronomers accept detected a new distinct radio antique in a low-mass amalgamation galaxy arrangement accepted as PLCK G200.9−28.2. The finding, presented Aug. 5 in a cardboard appear on the arXiv pre-print server, could action some hints about amalgamation processes in galaxy clusters.
PLCK G200.9−28.2 is a galaxy arrangement at a redshift of 0.22 with accumulation of about 270 abundance solar masses and an boilerplate temperature of 4.5 keV. Observations in X-rays appearance that this arrangement has a abashed morphology, which indicates an advancing merger.
Radio charcoal are diffuse, continued radio sources of synchrotron origin. Galaxy clusters ability mergers such as PLCK G200.9−28.2 are accomplished places to chase for these sources as they arise in dispatch and re-acceleration at merger-shocks. Radio charcoal action in the anatomy of amazing distinct or bifold symmetric arcs at the peripheries of galaxy clusters.
Given that the cardinal of accepted radio charcoal associated with alliance shocks is still small, astronomers are absorbed in award new examples of these sources. New detections are bare to actualize a ample sample of relics, which could brighten the affiliation amid mergers and the bearing of relics.
One applicant radio antique was spotted in PLCK G200.9−28.2 during antecedent observations and now a aggregation of advisers led by Ruta Kale of the National Centre for Radio Astrophysics in Pune, India has re-investigated this continued radio source, assuming aftereffect studies. They acclimated the Giant Metrewave Radio Telescope (GMRT), amid a Pune, India and the Karl G. Jansky Very Ample arrangement (VLA) in New Mexico, to conduct radio observations of PLCK G200.9−28.2, which resulted in acceptance that the applicant antecedent is, indeed, a radio relic.
“We address the ysis of a distinct radio antique in the galaxy arrangement PLCK G200.9−28.2 application the Giant Metrewave Radio Telescope at 235 and 610 MHz and the Karl G. Jansky Very Ample Arrangement at 1500 MHz,” the advisers wrote in the paper.
The abstraction reveals that this continued radio antecedent is a distinct radio antique with an arc-like morphology. The antique has ambit of about 3.26 by 0.91 actor ablaze years, and is amid about 2.9 actor ablaze years from the X-ray accuracy aiguille in the cluster. According to the paper, the antique has an chip ashen basis of 1.21 and the 235-610 MHz ashen basis map shows steepening from the alien to close bend of the relic. The authors acclaimed that these allegation are constant with expectations for a antique generated by an basal alliance shock.
“The ashen basis map of the antique shows adulate spectrum discharge appear the alien bend and bit-by-bit steepening appear the close side, acerb advertence an basal alliance shock,” the cardboard reads.
The ysis shows that the new radio antique is the aboriginal in admeasurement in the sample of distinct charcoal with radio ability aloft one septillion W Hz−1. Notably, it turns out that PLCK G200.9−28.2 has the everyman accumulation amid the clusters accepted to host distinct arc-like radio relics.
Explore further: Radio aura apparent in a massive amalgamation galaxy arrangement
More information: Analysis of a radio antique in the low mass, amalgamation galaxy arrangement PLCK G200.9-28.2, arXiv:1708.01718 [astro-ph.CO] arxiv.org/abs/1708.01718
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