EMU detection of mysterious multiple component radio-continuum emission from nearby spiral Seyfert I type galaxy ‘Sand-timer’ (NGC 7213)

@article{filipovic2026detection,
  title = {{EMU detection of mysterious multiple component radio-continuum emission from nearby spiral Seyfert I type galaxy ‘Sand-timer’ (NGC 7213)}},
  author = {Miroslav Filipović and Zachary Smeaton and Bärbel Koribalski and Roland Kothes and Adeel Ahmad and Ramy Al Saberi and Crisobal Bordiu and Aaron Bradley and Evan Crawford and Andrew Hopkins and Emilia Jaervelae and Sanja Lazarevic and Denis Leahy and Jeffry Payne and Faisal Rahman and Gavin Rowell and Hidetoshi Sanu and Michael Selby and Stanislav Shabala and Emma Stanton and Sam Taziux and Kisetsu Tsuge and Dejan Urosevic and Nicholas Tothill and Jacco van Loon and Velibor Velovic and Graeme White},
  journal = {The Open Journal of Astrophysics},
  year = {2026},
  month = oct,
  doi = {10.33232/001c.172532},
  url = {https://astro.theoj.org/article/172532-emu-detection-of-mysterious-multiple-component-radio-continuum-emission-from-nearby-spiral-seyfert-i-type-galaxy-sand-timer-ngc-7213},
  note = {CC BY 4.0},
}

TY  - JOUR
TI  - EMU detection of mysterious multiple component radio-continuum emission from nearby spiral Seyfert I type galaxy ‘Sand-timer’ (NGC 7213)
AU  - Miroslav Filipović
AU  - Zachary Smeaton
AU  - Bärbel Koribalski
AU  - Roland Kothes
AU  - Adeel Ahmad
AU  - Ramy Al Saberi
AU  - Crisobal Bordiu
AU  - Aaron Bradley
AU  - Evan Crawford
AU  - Andrew Hopkins
AU  - Emilia Jaervelae
AU  - Sanja Lazarevic
AU  - Denis Leahy
AU  - Jeffry Payne
AU  - Faisal Rahman
AU  - Gavin Rowell
AU  - Hidetoshi Sanu
AU  - Michael Selby
AU  - Stanislav Shabala
AU  - Emma Stanton
AU  - Sam Taziux
AU  - Kisetsu Tsuge
AU  - Dejan Urosevic
AU  - Nicholas Tothill
AU  - Jacco van Loon
AU  - Velibor Velovic
AU  - Graeme White
PY  - 2026
DA  - 2026/10/15
JO  - The Open Journal of Astrophysics
DO  - 10.33232/001c.172532
UR  - https://astro.theoj.org/article/172532-emu-detection-of-mysterious-multiple-component-radio-continuum-emission-from-nearby-spiral-seyfert-i-type-galaxy-sand-timer-ngc-7213
AB  - We present an Australian Square Kilometre Array Pathfinder (ASKAP) Evolutionary Map of the Universe (EMU) radio-continuum detection of the nearby spiral Seyfert I type galaxy NGC 7213 which we nickname ‘sand-timer’ due to its morphological appearance. We find an intriguing and peculiar emission extending from the central supermassive black hole (SMBH), which we refer to as galaxy hyperbubbles and/or active galactic nucleus (AGN) jets. Finally, we find two previously undetected kiloparsec-scale features in the polarised intensity image, which appear most likely also related to the central SMBH, as restarted bipolar radio jets, though somewhat obscured in the radio-continuum total intensity image. They resemble the bow shocks often seen in Fanaroff-Riley Class II (FR-II) radio galaxies, and so we propose they most likely represent an early episode of the ‘Sand-timer’s’ AGN jet activity. An alternative scenario is that the core of NGC 7213 may be a super massive binary black hole (SMBBH) which is undergoing a tidal disruption event (TDE), potentially causing the peculiar radio-continuum emission.
SN  - 2565-6120
ER  -