An AMUSING look at the host of the periodic nuclear transient ASASSN-14ko reveals a second AGN

Tucker, M. A.; Shappee, B. J.; Hinkle, J. T.; Neustadt, J. M. M.; Eracleous, M.; Kochanek, C. S.; Prieto, J. L.; Payne, A. V.; Galbany, L.; Anderson, J. P.; Auchettl, K.; Auge, C.; Holoien, Thomas W-S

doi:10.1093/mnras/stab2085

Title: An AMUSING look at the host of the periodic nuclear transient ASASSN-14ko reveals a second AGN

Journal Article · 22 July 2021 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stab2085 · OSTI ID:1813075

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ABSTRACT We present Multi-Unit Spectroscopic Explorer (MUSE) integral-field spectroscopy of ESO 253−G003, which hosts a known active galactic nucleus (AGN) and the periodic nuclear transient ASASSN-14ko, observed as part of the All-weather MUse Supernova Integral-field of Nearby Galaxies survey. The MUSE observations reveal that the inner region hosts two AGN separated by $$1.4\pm 0.1~\rm {kpc}$$ (≈1$${_{.}^{\prime\prime}}$$7). The brighter nucleus has asymmetric broad permitted emission-line profiles and is associated with the archival AGN designation. The fainter nucleus does not have a broad emission-line component but exhibits other AGN characteristics, including $$\hbox{$$v_{\rm {FWHM}}$$} \approx 700~\hbox{km~s$$^{-1}$$}$$ forbidden line emission, $$\rm{\log _{10}(\rm{[O\,\small {III}]}/\rm{H\beta})} \approx 1.1$$, and high-excitation potential emission lines, such as [Fe vii] λ6086 and He ii λ4686. The host galaxy exhibits a disturbed morphology with large kpc-scale tidal features, potential outflows from both nuclei, and a likely superbubble. A circular relativistic disc model cannot reproduce the asymmetric broad emission-line profiles in the brighter nucleus, but two non-axisymmetric disc models provide good fits to the broad emission-line profiles: an elliptical disc model and a circular disc + spiral arm model. Implications for the periodic nuclear transient ASASSN-14ko are discussed.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0019323

OSTI ID:: 1813075

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 506; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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