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  X-ray quasi-periodic eruptions from two previously quiescent galaxies

Arcodia, R., Merloni, A., Nandra, K., Buchner, J., Salvato, M., Pasham, D., et al. (2021). X-ray quasi-periodic eruptions from two previously quiescent galaxies. Nature, 592, 704-707. doi:10.1038/s41586-021-03394-6.

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Arcodia, R.1, Author           
Merloni, A.1, Author           
Nandra, K.1, Author           
Buchner, J.1, Author           
Salvato, M.1, Author           
Pasham, D., Author
Remillard, R., Author
Comparat, J.1, Author           
Lamer, G., Author
Ponti, G.1, Author           
Malyali, A.1, Author           
Wolf, J.1, Author           
Arzoumanian, Z., Author
Bogensberger, D.1, Author           
Buckley, D. A. H., Author
Gendreau, K., Author
Gromadzki, M., Author
Kara, E., Author
Krumpe, M., Author
Markwardt, C., Author
Ramos-Ceja, M. E.1, Author           Rau, A.1, Author           Schramm, M., AuthorSchwope, A., Author more..
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: Quasi-periodic eruptions (QPEs) are very-high-amplitude bursts of X-ray radiation recurring every few hours and originating near the central supermassive black holes of galactic nuclei1,2. It is currently unknown what triggers these events, how long they last and how they are connected to the physical properties of the inner accretion flows. Previously, only two such sources were known, found either serendipitously or in archival data1,2, with emission lines in their optical spectra classifying their nuclei as hosting an actively accreting supermassive black hole3,4. Here we report observations of QPEs in two further galaxies, obtained with a blind and systematic search of half of the X-ray sky. The optical spectra of these galaxies show no signature of black hole activity, indicating that a pre-existing accretion flow that is typical of active galactic nuclei is not required to trigger these events. Indeed, the periods, amplitudes and profiles of the QPEs reported here are inconsistent with current models that invoke radiation-pressure-driven instabilities in the accretion disk5,6,7,8,9. Instead, QPEs might be driven by an orbiting compact object. Furthermore, their observed properties require the mass of the secondary object to be much smaller than that of the main body10, and future X-ray observations may constrain possible changes in their period owing to orbital evolution. This model could make QPEs a viable candidate for the electromagnetic counterparts of so-called extreme-mass-ratio inspirals11,12,13, with considerable implications for multi-messenger astrophysics and cosmology14,15.

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Language(s): eng - English
 Dates: 2021-04-28
 Publication Status: Published online
 Pages: -
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 Identifiers: DOI: 10.1038/s41586-021-03394-6
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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 592 Sequence Number: - Start / End Page: 704 - 707 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238