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A new class of extragalactic astronomical sources discovered in 2021, named odd radio circles (ORCs) 1 , are large rings of faint, diffuse radio continuum emission spanning approximately 1 arcminute on the sky. Galaxies at the centres of several ORCs have photometric redshifts of z ≃ 0.3-0.6, implying physical scales of several 100 kpc in diameter for the radio emission, the origin of which is unknown. Here we report spectroscopic data on an ORC including strong [O II] emission tracing ionized gas in the central galaxy of ORC4 at z = 0.4512. The physical extent of the [O II] emission is approximately 40 kpc in diameter, larger than expected for a typical early-type galaxy 2 but an order of magnitude smaller than the large-scale radio continuum emission. We detect an approximately 200 km s -1 velocity gradient across the [O II] nebula, as well as a high velocity dispersion of approximately 180 km s -1 . The [O II] equivalent width (approximately 50 Å) is extremely high for a quiescent galaxy. The morphology, kinematics and strength of the [O II] emission are consistent with the infall of shock ionized gas near the galaxy, following a larger, outward-moving shock. Both the extended optical and radio emission, although observed on very different scales, may therefore result from the same dramatic event.

Titel:	Ionized gas extends over 40 kpc in an odd radio circle host galaxy.
Autor/in / Beteiligte Person:	Coil, AL ; Perrotta, S ; Rupke, DSN ; Lochhaas, C ; Tremonti, CA ; Diamond-Stanic, A ; Fielding, D ; Geach, JE ; Hickox, RC ; Moustakas, J ; Rudnick, GH ; Sell, P ; Whalen, KE
Link:	Zum Volltext
Zeitschrift:	Nature, Jg. 625 (2024), Heft 7995, S. 459-462
Veröffentlichung:	Basingstoke : Nature Publishing Group ; <i>Original Publication</i>: London, Macmillan Journals ltd., 2024
Medientyp:	academicJournal
ISSN:	1476-4687 (electronic)
DOI:	10.1038/s41586-023-06752-8
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Ionized gas extends over 40 kpc in an odd radio circle host galaxy.