MUSE observations of a changing-look AGN I: The re-appearance of the broad emission lines
| Autor: | Bradley M. Peterson, D. Lawther, S. I. Raimundo, Jun Yi Koay, Marianne Vestergaard, Casasola |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Active galactic nucleus 010308 nuclear & particles physics astro-ph.GA Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy and Astrophysics Astrophysics Radius Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Astrophysics - Astrophysics of Galaxies Galaxy Orders of magnitude (time) Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Ionization 0103 physical sciences Dispersion (optics) Outflow Emission spectrum 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Raimundo, S I, Vestergaard, M, Koay, J Y, Lawther, D, Casasola, V & Peterson, B M 2019, ' MUSE observations of a changing-look AGN I : The re-appearance of the broad emission lines ', Monthly Notices of the Royal Astronomical Society, vol. 486, no. 1, pp. 123-140 . https://doi.org/10.1093/mnras/stz852 |
| DOI: | 10.1093/mnras/stz852 |
| Popis: | Optical changing-look Active Galactic Nuclei (AGN) are a class of sources that change type within a short timescale of years or decades. This change is characterised by the appearance or disappearance of broad emission lines, often associated with dramatic AGN continuum flux changes that are orders of magnitude larger than those expected from typical AGN variability. In this work we study for the first time the host galaxy of a changing-look AGN, Mrk 590, using high spatial resolution optical and near-infrared observations. We discover that after ~ 10 yr absence, the optical broad emission lines of Mrk 590 have reappeared. The AGN optical continuum flux however, is still ~ 10 times lower than that observed during the most luminous state in the 1990s. The host galaxy shows a 4.5 kpc radius star-forming ring with knots of ionised and cold molecular gas emission. Extended ionised and warm molecular gas emission are detected in the nucleus, indicating that there is a reservoir of gas as close as 60 pc from the black hole. We observe a nuclear gas spiral between radii r ~ 0.5 - 2 kpc, which has been suggested as a dynamical mechanism able to drive the necessary gas to fuel AGN. We also discover blue-shifted and high velocity dispersion [O III] emission out to a radius of 1 kpc, tracing a nuclear gas outflow. The gas dynamics in Mrk 590 suggest a complex balance between gas inflow and outflow in the nucleus of the galaxy. Accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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