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  1. Home
  2. Browse by Author

Browsing by Author "Muller-Sanchez, Francisco"

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    Evolution of the dual AGN in Mrk 266: a young AGN and a rotation-dominated disc in the SW nucleus
    (2024) Ruby, Mason; Muller-Sanchez, Francisco; Comerford, Julia M.; Stern, Daniel; Cales, Sabrina L.; Harrison, Fiona; Malkan, Matthew A.; Privon, George C.; Treister, Ezequiel
    Dual active galactic nuclei (AGNs) offer a unique opportunity to probe the relationship between supermassive black holes (SMBH) and their host galaxies as well as the role of major mergers in triggering AGN activity. The confirmed dual AGN Mrk 266 has been studied extensively with multiwavelength imaging. Now, high-spatial-resolution IFU spectroscopy of Mrk 266 provides an opportunity to probe the kinematics of both the merger event and AGN feedback. We present for the first time high-spatial-resolution kinematic maps for both nuclei of Mrk 266 obtained with the Keck OSIRIS IFU spectrograph, utilizing adaptive optics to achieve a resolution of 0.31 and 0.20arcsec for the NE and SW nuclei, respectively. Using the MBH-sigma & lowast; relation for mergers, we infer an SMBH mass of approximately 7x10(7)M(circle dot) for the south-western nucleus. Additionally, we report that the molecular gas kinematics of the south-western nucleus are dominated by rotation rather than large-scale chaotic motions. The south-west nucleus also contains both a circumnuclear ring of star formation from which an inflow of molecular gas is likely fuelling the AGN and a compact, AGN-dominated outflow of highly ionized gas with a time-scale of approximately 2 Myr, significantly shorter than the time-scale of the merger. The north-eastern nucleus, on the other hand, exhibits complex kinematics related to the merger, including molecular gas that appears to have decoupled from the rotation of the stars. Our results suggest that while the AGN activity in Mrk 266 was likely triggered during the merger, AGN feeding is currently the result of processes internal to each host galaxy, thus resulting in a strong asymmetry between the two nuclei.
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    UGC 4211: A Confirmed Dual Active Galactic Nucleus in the Local Universe at 230 pc Nuclear Separation
    (2023) Koss, Michael J.; Treister, Ezequiel; Kakkad, Darshan; Casey-Clyde, J. Andrew; Kawamuro, Taiki; Williams, Jonathan; Foord, Adi; Trakhtenbrot, Benny; Bauer, Franz E.; Privon, George C.; Ricci, Claudio; Mushotzky, Richard; Barcos-Munoz, Loreto; Blecha, Laura; Connor, Thomas; Harrison, Fiona; Liu, Tingting; Magno, Macon; Mingarelli, Chiara M. F.; Muller-Sanchez, Francisco; Oh, Kyuseok; Shimizu, T. Taro; Smith, Krista Lynne; Stern, Daniel; Tello, Miguel Parra; Urry, C. Megan
    We present multiwavelength high-spatial resolution (similar to 0 ? 1, 70 pc) observations of UGC 4211 at z = 0.03474, a late-stage major galaxy merger at the closest nuclear separation yet found in near-IR imaging (0 " 32, similar to 230 pc projected separation). Using Hubble Space Telescope/Space Telescope Imaging Spectrograph, Very Large Telescope/MUSE+AO, Keck/OSIRIS+AO spectroscopy, and the Atacama Large Millimeter/submillimeter Array (ALMA) observations, we show that the spatial distribution, optical and near-infrared emission lines, and millimeter continuum emission are all consistent with both nuclei being powered by accreting supermassive black holes (SMBHs). Our data, combined with common black hole mass prescriptions, suggest that both SMBHs have similar masses, log (M-BH M-?) similar to 8.1 (south) and log (M-BH M-?) similar to 8.3 (north), respectively. The projected separation of 230 pc (similar to 6x the black hole sphere of influence) represents the closest-separation dual active galactic nuclei (AGN) studied to date with multiwavelength resolved spectroscopy and shows the potential of nuclear (< 50 pc) continuum observations with ALMA to discover hidden growing SMBH pairs. While the exact occurrence rate of close-separation dual AGN is not yet known, it may be surprisingly high, given that UGC 4211 was found within a small, volume-limited sample of nearby hard X-ray detected AGN. Observations of dual SMBH binaries in the subkiloparsec regime at the final stages of dynamical friction provide important constraints for future gravitational wave observatories.

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