Design World

  • Home
  • Technologies
    • 3D CAD
    • Electronics • electrical
    • Fastening & Joining
    • Factory automation
    • Linear Motion
    • Motion Control
    • Test & Measurement
    • Sensors
    • Fluid power
  • Learn
    • Ebooks / Tech Tips
    • Engineering Week
    • Future of Design Engineering
    • MC² Motion Control Classrooms
    • Podcasts
    • Videos
    • Webinars
  • LEAP AWARDS
  • Leadership
    • 2022 Voting
    • 2021 Winners
  • Design Guide Library
  • Resources
    • 3D Cad Models
      • PARTsolutions
      • TraceParts
    • Digital Issues
      • Design World
      • EE World
    • Women in Engineering
  • Supplier Listings

A Peek Into The Merging Galaxy Cluster Abell 3888

By Tomasz Nowakowski, Phys.org | February 17, 2016

Share

Studying substructures of galaxy clusters can reveal important information about the morphology and evolution processes of these gravity-bound groups of galaxies. Optical spectroscopy is very helpful in this matter, capable of unraveling the history of large-scale structure formation in the universe. That’s why a team of astronomers from New Zealand conducted a series of spectroscopic observations to peek into the galaxy cluster Abell 3888, unveiling that this cluster is dynamically young and might be an indicator of an ongoing or past merger event. A paper detailing the findings was published online on Feb. 11 on the arXiv pre-print server.

The team, led by Sara Shakouri of the Victoria University of Wellington in New Zealand, has used the AAOmega spectrograph installed on the 3.9-meter Anglo-Australian Telescope (AAT) situated at the Siding Spring Observatory in Australia. Thanks to the spectrograph’s 400 fibres covering a two-degree field when projected on sky, it is an excellent instrument for examining the optical substructure in nearby southern clusters.

The researchers carried out their observations in May 2013. They were initially targeting nearly 800 galaxies up to 30′ radius from the centre of the cluster. In result, the team detected 254 new redshifts in this region and in combination with previous findings, they determined that Abell 3888, as the main structure, has 71 member galaxies. Importantly, the astronomers were able to identify substructures in the field that were very helpful in unraveling the merging nature of this galaxy cluster.

“The combination of pieces of evidence from the optical analysis, the elongated optical galaxy distribution, and our substructure test which showed that Abell 3888 is bimodal strongly suggests that this cluster has had dynamical interactions and is highly likely to be a young cluster in an active merging state,” the paper reads.

Galaxies and galaxy groups come together and merge to form larger units such as galaxy clusters. Cluster merging is believed to be a key parameter in formation and evolution of galaxy clusters. The process is very common and has a significant impact on cluster characteristics such as velocity dispersion, temperature and mass. It often generates clumps of galaxies within the cluster volume. This change in galaxy volumetric density is known as “substructure.”

“Substructures may be formed through the infall of individual galaxies or galaxy groups into a relaxed cluster or during the merging of two or more entire galaxy clusters,” the researchers wrote in the paper.

Currently, the most robust method to detect merging is the combination of the optical and X-ray substructure analyses of clusters. Therefore, Shakouri and her colleagues underline that results from spectroscopic observations of Abell 3888 are consistent with previous findings from the X-ray studies focused on unveiling morphology of galaxy clusters.

In addition, the team also detected six galaxy over-densities in the field. Three of them were classified as new galaxy clusters.

The researchers concluded that further spectroscopic analysis of Abell 3888 would be useful to further probe its dynamics. They also stressed the need for single slit spectroscopy or more usefully observations with an integral field unit are required to increase the spectroscopic coverage in the cluster core.

“This would allow a more detailed probe of the cluster core and better statistics on the merging populations,” the scientists noted.


Filed Under: Aerospace + defense

 

Related Articles Read More >

Ontic acquires Servotek and Westcon product lines from Marsh Bellofram
Flexible rotary shafts support thrust reverser on 150 LEAP 1-A turbofan engines
Drone-mounted inspection breaks barriers for F-35
TriStar, a misunderstood failure of design

DESIGN GUIDE LIBRARY

“motion

Enews Sign Up

Motion Control Classroom

Design World Digital Edition

cover

Browse the most current issue of Design World and back issues in an easy to use high quality format. Clip, share and download with the leading design engineering magazine today.

EDABoard the Forum for Electronics

Top global problem solving EE forum covering Microcontrollers, DSP, Networking, Analog and Digital Design, RF, Power Electronics, PCB Routing and much more

EDABoard: Forum for electronics

Sponsored Content

  • Global supply needs drive increased manufacturing footprint development
  • How to Increase Rotational Capacity for a Retaining Ring
  • Cordis high resolution electronic proportional pressure controls
  • WAGO’s custom designed interface wiring system making industrial applications easier
  • 10 Reasons to Specify Valve Manifolds
  • Case study: How a 3D-printed tool saved thousands of hours and dollars

Design World Podcasts

May 17, 2022
Another view on additive and the aerospace industry
See More >
Engineering Exchange

The Engineering Exchange is a global educational networking community for engineers.

Connect, share, and learn today »

Design World
  • Advertising
  • About us
  • Contact
  • Manage your Design World Subscription
  • Subscribe
  • Design World Digital Network
  • Engineering White Papers
  • LEAP AWARDS

Copyright © 2022 WTWH Media LLC. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media
Privacy Policy | Advertising | About Us

Search Design World

  • Home
  • Technologies
    • 3D CAD
    • Electronics • electrical
    • Fastening & Joining
    • Factory automation
    • Linear Motion
    • Motion Control
    • Test & Measurement
    • Sensors
    • Fluid power
  • Learn
    • Ebooks / Tech Tips
    • Engineering Week
    • Future of Design Engineering
    • MC² Motion Control Classrooms
    • Podcasts
    • Videos
    • Webinars
  • LEAP AWARDS
  • Leadership
    • 2022 Voting
    • 2021 Winners
  • Design Guide Library
  • Resources
    • 3D Cad Models
      • PARTsolutions
      • TraceParts
    • Digital Issues
      • Design World
      • EE World
    • Women in Engineering
  • Supplier Listings