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First sighting of hot gas sloshing in galaxy cluster

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Science & Exploration

10/01/2020
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ESA’s XMM-Newton X-ray observatory has spied sizzling fuel sloshing round inside a galaxy cluster – a never-before-seen behaviour which may be pushed by turbulent merger occasions.

Galaxy clusters are the most important techniques within the Universe certain collectively by gravity. They comprise lots of to 1000’s of galaxies and enormous portions of sizzling fuel often called plasma, which reaches temperatures of round 50 million levels and shines brightly in X-rays.

Little or no is understood about how this plasma strikes, however exploring its motions could also be key to understanding how galaxy clusters type, evolve and behave.

Gas motions in the Perseus cluster

“We chosen two close by, huge, brilliant and well-observed galaxy clusters, Perseus and Coma, and mapped how their plasma moved – whether or not it was transferring in direction of or away from us, its pace, and so forth – for the primary time,” says Jeremy Sanders of the Max Planck Institute for Extraterrestrial Physics in Garching, Germany, and lead writer of the brand new examine.

“We did this over giant areas of sky: an space roughly the dimensions of two full Moons for Perseus, and 4 for Coma. We actually wanted XMM-Newton for this, because it’d be extraordinarily tough to cowl such giant areas with another spacecraft.”

Jeremy and colleagues discovered direct indicators of plasma flowing, splashing and sloshing round inside the Perseus galaxy cluster – one of the huge identified objects within the Universe, and the brightest cluster within the sky when it comes to X-rays. Whereas this type of movement has been predicted theoretically, it had by no means been seen earlier than within the cosmos.

By taking a look at simulations of how the plasma moved inside the cluster, the researchers then explored what was making the sloshing. They discovered it to be probably as a consequence of smaller sub-clusters of galaxies colliding and merging with the primary cluster itself. These occasions are energetic sufficient to disrupt Perseus’ gravitational subject and kickstart a sloshing movement that may final for a lot of tens of millions of years earlier than settling.

Simulation of sloshing gas in Perseus

In contrast to Perseus, which is characterised by a primary cluster and several other smaller sub-structures, the Coma cluster contained no sloshing plasma, and seems to as an alternative be an enormous cluster made up of two main sub-clusters which might be slowly merging collectively.

“Coma incorporates two huge central galaxies reasonably than a cluster’s normal single behemoth, and totally different areas seem to comprise materials that strikes in another way,” says Jeremy.

“This means that there are a number of streams of fabric inside the Coma cluster that haven’t but come collectively to type a single coherent ‘blob’, like we see with Perseus.”

X-ray and optical view of the Coma galaxy cluster

The discovering was made potential by a brand new calibration approach utilized to XMM-Newton’s European Photon Imaging Camera (EPIC). The ingenious technique, which concerned mining 20 years of archival EPIC information, improved the accuracy of the digicam’s velocity measurements by an element of over three.5, elevating XMM-Newton’s capabilities to a brand new stage.

“The EPIC digicam has an instrumental background sign – the so-called ‘fluorescent strains’ that are at all times current in our information, and might generally be annoying as they’re normally not what we’re on the lookout for,” provides co-author Ciro Pinto, an ESA analysis fellow on the European Area Analysis and Know-how Centre in Noordwijk, The Netherlands, who not too long ago moved to Italy’s Nationwide Institute for Astrophysics.

“We determined to make use of these strains, that are a relentless characteristic, to check and align EPIC information from the previous 20 years to raised decide how the digicam behaves, after which used this to appropriate for any instrumental variation or results.”

Gas motions in the Coma cluster

This method made it potential to map the fuel within the clusters extra precisely. Jeremy, Ciro and colleagues used the background strains to recognise and take away particular person variations between observations, after which eradicated any subtler instrumental results recognized and flagged up by their 20 years of EPIC information mining.

EPIC includes three CCD cameras designed to seize each low- and high-energy X-rays, and is one in every of a trio of superior devices aboard XMM-Newton.

Exploring the dynamic X-ray sky since its launch in 1999, XMM-Newton is the most important scientific satellite tv for pc ever in-built Europe, and carries a number of the strongest telescope mirrors ever developed.

“This calibration approach highlights newfound capabilities of the EPIC digicam,” says Norbert Schartel, ESA XMM-Newton Undertaking Scientist.

“Excessive-energy astrophysics typically entails evaluating X-ray information at totally different factors within the cosmos for the whole lot from plasma to black holes, so the flexibility to minimise instrumental results is vital. Through the use of previous XMM-Newton observations to refine future ones, the brand new approach might open up inspiring alternatives for brand spanking new analysis and discovery.”

These XMM-Newton observations may even stay unparalleled till the launch of ESA’s Advanced Telescope for High-ENergy Astrophysics (Athena) in 2031. Whereas overlaying such giant areas of sky will largely be past the capabilities of telescopes such because the upcoming JAXA/NASA X-ray Imaging and Spectroscopy Mission, or XRISM, Athena will mix a big X-ray telescope with state-of-the-art scientific devices to shed new mild on the new, energetic Universe.

Notes for editors

Measuring bulk flows of the intracluster medium in the Perseus and Coma galaxy clusters using XMM-Newton” by J. S. Sanders et al. is printed in Astronomy & Astrophysics.

The examine makes use of X-ray observations from XMM-Newton’s European Photon Imaging Digicam (EPIC), and information from JAXA’s Hitomi satellite tv for pc for comparability and parts of calibration.

For extra info, please contact:

Jeremy Sanders
Max Planck Institute for Extraterrestrial Physics
Garching, Germany
E-mail: jsanders@mpe.mpg.de

Ciro Pinto
European Area Company
European Area Analysis and Know-how Centre
Noordwijk, The Netherlands
Institute of Area Astrophysics and Cosmic Physics (IASF)
Nationwide Institute for Astrophysics (INAF)
Palermo, Italy
E-mail: ciro.pinto@inaf.it
 
Norbert Schartel
XMM-Newton undertaking scientist
European Area Company
E-mail: norbert.schartel@esa.int


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