Astronomers reveal cosmic ribbon around rare galaxy

Publicly released:
Australia; International; WA
Caption: Dr Jayanne English, an expert in astronomy image-making at the University of Manitoba, combined data obtained from ASKAP with optical and infrared data from the Subaru telescope in Hawaii to make the dramatic composite image of NGC 4632. Image Credit: J. English (U.Manitoba), with support of T. Jarrett (UCT) and the WALLABY team: ATNF/ASKAP:Suburu/Hyper Suprime Camera
Caption: Dr Jayanne English, an expert in astronomy image-making at the University of Manitoba, combined data obtained from ASKAP with optical and infrared data from the Subaru telescope in Hawaii to make the dramatic composite image of NGC 4632. Image Credit: J. English (U.Manitoba), with support of T. Jarrett (UCT) and the WALLABY team: ATNF/ASKAP:Suburu/Hyper Suprime Camera

International astronomers using a telescope owned and operated by CSIRO, Australia’s national science agency, have revealed a galaxy wrapped in a cosmic ‘ribbon’. The research, led by Dr Nathan Deg and Dr Kristine Spekkens from Queen’s University Canada and co-authored by CSIRO’s Professor Bärbel Koribalski, presents a stunning image of a galaxy called NGC 4632 that is 56 million light years from Earth.

Media release

From: CSIRO

International astronomers using a telescope owned and operated by CSIRO, Australia’s national science agency, have revealed a galaxy wrapped in a cosmic ‘ribbon’.

The research, led by Dr Nathan Deg and Dr Kristine Spekkens from Queen’s University Canada and co-authored by CSIRO’s Professor Bärbel Koribalski, presents a stunning image of a galaxy called NGC 4632 that is 56 million light years from Earth.

It’s been identified as a potential polar ring galaxy, which are some of the most spectacular types of galaxies in the Universe, and among the most mysterious.

Detected using CSIRO’s ASKAP radio telescope on Wajarri Yamaji Country in Western Australia, the galaxy features a ring of gas that can only be seen at radio wavelengths. The ring is orbiting the galaxy at right angles to its spiral disk, like a parcel wrapped in a ribbon of cosmic gas, dust and stars.

Dr Nathan Deg co-authored the paper published today in Monthly Notices of the Royal Astronomical Society.

“The findings suggest that one to three per cent of nearby galaxies may have gaseous polar rings, which is much higher than suggested by optical telescopes. Polar ring galaxies might be more common than previously thought,” Dr Deg said.

“While this is not the first time astronomers have observed polar ring galaxies, NGC 4632 is the first observed with ASKAP and there may be many more to come,”

Professor Koribalski said the WALLABY survey aims to observe the whole southern sky using ASKAP to detect and visualise the gas distribution in hundreds of thousands of galaxies.

“NGC 4632 is one of two polar ring galaxies we’ve identified from 600 galaxies that were mapped in our first small WALLABY survey.

“Using ASKAP over coming years we expect to reveal more than 200,000 hydrogen-rich galaxies, among them many more unusual galaxies like these ones with polar rings,” Professor Koribalski said.

Why polar rings exist is still a puzzle to astronomers. One possible explanation is that their stellar rings, which appear blended with gas clouds, are shredded material from a passing galaxy.

Another possibility is that hydrogen gas flows along the filaments of the cosmic web and accretes into a ring around a galaxy, possibly forming stars during this process.

In the future, polar ring galaxies can also be used to deepen our understanding of the universe, with potential applications in dark matter research. It is possible to use polar rings to probe the shape of dark matter of the host galaxy, which could lead to new clues about the mysterious properties of the elusive substance.

Over 25 global collaborators from Canada, Australia, South Africa, Ecuador, Burkina Faso, Germany, China, and beyond worked together to analyse data from the first WALLABY survey collected using ASKAP and processed by the Pawsey Supercomputing Research Centre in Western Australia.

ASKAP is part of CSIRO’s Australia Telescope National Facility. It is also a precursor to the international SKA telescopes currently being built in Australia and South Africa.

– ends –

CSIRO’s ASKAP telescope is located at Inyarrimanha Ilgari Bundara, the CSIRO Murchison Radio-astronomy Observatory. We acknowledge the Wajarri Yamaji as the Traditional Owners and native title holders of the observatory site.

Multimedia

Polar ring galaxy NGC 4632
Polar ring galaxy NGC 4632
CSIRO's ASKAP radio telescope under the Milky Way on Wajarri Yamaji Country
CSIRO's ASKAP radio telescope under the Milky Way on Wajarri Yamaji Country
Virtual Reality isolates a ring of cold gas orbiting galaxy NGC 4632

Attachments

Note: Not all attachments are visible to the general public. Research URLs will go live after the embargo ends.

Other CSIRO, Web page Multimedia Assets
Research Monthly Notices of the Royal Astronomical Society, Web page Published research paper
Journal/
conference:
Monthly Notices of the Royal Astronomical Society
Organisation/s: CSIRO, Swinburne University of Technology, International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia, ARC Centre of Excellence for All Sky Astrophysics in 3D (ASTRO 3D), Western Sydney University; Curtin University; Queen's University Canada; University of Manitoba
Funder: Operation of ASKAP is funded by the Australian Government with support from the National Collaborative Research Infrastructure Strategy. ASKAP uses the resources of the Pawsey Supercomputing Centre. Establishment of ASKAP, the Murchison Radio-astronomy Observatory and the Pawsey Supercomputing Centre are initiatives of the Australian Government, with support from the Government of Western Australia and the Science and Industry Endowment Fund. WALLABY acknowledges technical support from the Australian SKA Regional Centre (AusSRC) and Astronomy Data And Computing Services (ADACS). This research uses services or data provided by the Astro Data Lab at NSF’s National Optical-Infrared Astronomy Research Laboratory. NOIRLab is operated by the Association of Universities for Research in Astronomy (AURA), Inc. under a cooperative agreement with the National Science Foundation. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. Parts of this research were supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. T.H.J. acknowledges support from the National Research Foundation (South Africa). AB acknowledges support from the Centre National d’Etudes Spatiales (CNES), France. P.K. is supported by the BMBF project 05A20PC4 for D-MeerKAT. K.S. acknowledges support from the Natural Sciences and Engineering Research Council of Canada (NSERC).
Media Contact/s
Contact details are only visible to registered journalists.