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This galaxy cluster has mysterious cosmic tendrils over 200,000 light-years lengthy (picture)

June 21, 2025
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This galaxy cluster has mysterious cosmic tendrils over 200,000 light-years lengthy (picture)
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Astronomers have obtained the deepest and highest decision picture of the galaxy cluster Abell 2255, observing the unexplained radio-emitting tendrils that path it in unprecedented element.

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Abell 2255 is a cluster containing between 300 and 500 constituent galaxies, lots of that are merging. It is positioned round 800 million light-years from Earth and spans round 16.3 million light-years. The crew behind this analysis was within the so-called “radio galaxies” of this cluster.

Radio galaxies are galaxies dominated by feeding supermassive black holes that launch out highly effective jets of matter at near-light speeds. This new investigation of Abell 2255 may reveal how radio galaxies evolve and the way supermassive black hole-launched jets work together with fuel and mud between galaxies, an area referred to as the intergalactic medium.


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“These outcomes open the best way to new views for the research not solely of radio galaxies but additionally of the properties of the fuel that permeates galaxy clusters,” Marco Bond, research crew member and a researcher on the Nationwide Institute for Astrophysics (INAF), mentioned in an announcement.

Chasing radio tails

The crew obtained their Abell 2255 knowledge utilizing the European Low Frequency Array (LOFAR) radio telescope in its Very Lengthy Baseline Interferometry (VLBI) mode. With 56 hours of observations at a radio frequency of 144 MHz, the researchers had been capable of receive deep photographs of the galaxy cluster with an angular decision of as much as 0.3 arcseconds.

This revealed elongated filamentary constructions stretching out for between 260,000 and 360,000 light-years. That is longer than 3 instances the width of the Milky Method. The thickness of those filaments, nevertheless, is lower than a tenth of the width of our galaxy.

The crew behind this analysis theorizes that these filaments originate from inside the radio galaxies of Abell 2255 and had been dragged out by turbulent movement inside the galaxy cluster. The filaments will ultimately combine inside the intergalactic medium of fuel and mud in Abell 2255.

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A swirl of white smoke against a black background

OFAR-VLBI map of the Unique Tailed Radio Galaxy, with the areas used to investigate its most important morphological traits highlighted in several colours. (Picture credit score: E. De Rubeis (College of Bologna – INAF) et al. / A&A 2025)

One of many radio galaxies the crew targeted on specifically was the Unique Tailed Radio Galaxy, which possesses a tangled tail and wealthy filaments, options which have by no means earlier than been noticed in such element.

The brand new LOFAR photographs additionally reveal beforehand unseen particulars of different radio galaxies inside the Abell 2255, together with the Goldfish, the Beaver and the Embryo galaxies — all of that are notable for his or her distorted shapes and huge, trailing radio tails that stretch greater than 200,000 light-years.

“Our most important aim was to make use of LOFAR-VLBI to detect doable filaments within the tails of the radio galaxies of Abell 2255, with a purpose to research their morphological traits and perceive their origin,” crew member and College of Bologna researcher Emanuele De Rubeis mentioned. “Phenomena of this kind are rising increasingly regularly due to trendy interferometers, such because the precursors of the SKA undertaking, and provide invaluable alternatives to research the magnetic properties of the new fuel permeating the cluster and the mechanisms of particle acceleration.”

The crew’s analysis is a part of a wider investigation made doable with latest developments in calibration strategies. of LOFAR-VLBI knowledge.

“We calibrated 56 hours of observations, divided into nightly periods of about 8 hours every. The uncooked knowledge from every night time is about 4 terabytes, however after calibration, the quantity will increase to 18 to twenty terabytes for a complete of about 140 terabytes total,” De Rubeis mentioned. “After all, calibrating the info and acquiring high quality photographs took loads of trial and error. To totally course of a single night time and produce photographs of all of the sources, it took us a couple of month on common.”

The crew’s analysis was printed on June 10 within the journal Astronomy & Astrophysics.



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Tags: clustercosmicGalaxyimageLightYearsLongMysterioustendrils
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