Early results in the search for extreme coronal line emitters with the Dark Energy Spectroscopic Instrument

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ID: 313939
2026
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Abstract
Abstract Here we present the results of our search through the Early Data Release (EDR) of the Dark Energy Spectroscopic Instrument (DESI) for extreme coronal line emitters (ECLEs) – a rare classification of galaxies displaying strong, high-ionisation iron coronal emission lines within their spectra. With the requirement of a strong X-ray continuum to generate the coronal emission, ECLEs have been linked to both active galactic nuclei (AGNs) and tidal disruption events (TDEs). We focus our search on identifying TDE-linked ECLEs. We identify three such objects within the EDR sample, highlighting DESI’s effectiveness for discovering new nuclear transients, and determine a galaxy-normalised TDE-linked ECLE rate of $R_\mathrm{G}=5~^{+5}_{-3}\times 10^{-6}~\mathrm{galaxy}^{-1}~\mathrm{yr}^{-1}$ at a median redshift of z = 0.2 – broadly consistent with previous work. Additionally, we identify more than 200 AGNs displaying coronal emission lines, which serve as the primary astrophysical contaminants in searches for TDE-related events. We also include an outline of the custom Python code developed for this search.
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Authors Peter Clark, Joseph Callow, Or Graur, Alexei V Filippenko, Thomas G Brink, WeiKang Zheng, Jessica Aguilar, Steven Ahlen, Segev BenZvi, Davide Bianchi, David Brooks, Todd Claybaugh, Andrei Cuceu, Axel de la Macorra, Arjun Dey, Peter Doel, V A Fawcett, Jaime E Forero-Romero, Enrique Gaztañaga, Satya Gontcho A Gontcho, Gaston Gutierrez, Mustapha Ishak, Jorge Jimenez, Dick Joyce, Stephanie Juneau, Theodore Kisner, Anthony Kremin, Martin Landriau, L Le Guillou, Marc Manera, Aaron Meisner, Ramon Miquel, John Moustakas, Seshadri Nadathur, Will J. Percival, Ignasi Pérez-Ràfols, Francisco Prada, Graziano Rossi, Eusebio Sanchez, David Schlegel, Michael Schubnell, J Silber, David Sprayberry, Gregory Tarlé, B A Weaver, Zhou R, Hu Zou
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag887
URL
https://doi.org/10.1093/mnras/stag887
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