Browsing by Author "Wong, O. Ivy"

Now showing 1 - 5 of 5
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    AGNs and their host galaxies in the local universe : two mass-independent Eddington ratio distribution functions characterize black hole growth.
    (2017) Weigel, Anna; Ezequiel Treister.; Schawinski, Kevin; Caplar, Neven; Wong, O. Ivy; Trakhtenbrot, Benny
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    BAT AGN Spectroscopic Survey - XVII. The parsec-scale jet properties of the ultrahard X-ray-selected local AGNs
    (2019) Baek, Junhyun; Chung, Aeree; Schawinski, Kevin; Oh, Kyuseok; Wong, O. Ivy; Koss, Michael; Ricci, Claudio; Trakhtenbrot, Benny; Smith, Krista Lynne; Ueda, Yoshihiro
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    Extended X-ray emission in the IC 2497 - Hanny's Voorwerp system: energy injection in the gas around a fading AGN.
    (2016) Sartori, Lia F.; Schawinski, Kevin; Koss, M.; Treister, Ezequiel; Maksym, W. Peter; Keel, William C.; Urry, C. Megan; Lintott, Chris J.; Wong, O. Ivy
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    Significant Suppression of Star Formation in Radio-quiet AGN Host Galaxies with Kiloparsec-scale Radio Structures
    (2020) Smith, Krista Lynne; Koss, Michael; Mushotzky, Richard; Wong, O. Ivy; Shimizu, T. Taro; Ricci, Claudio; Ricci, Federica
    We conducted 22 GHz 1 '' Jansky Very Large Array imaging of 100 radio-quiet X-ray-selected active galactic nuclei (AGN) from the Swift-Burst Array Telescope (Swift-BAT) survey. We find AGN-driven kiloparsec-scale radio structures inconsistent with pure star formation in 11 AGN. The host galaxies of these AGN lie significantly below the star-forming main sequence, indicating suppressed star formation. While these radio structures tend to be physically small compared to the host galaxy, the global star formation rate of the host is affected. We evaluate the energetics of the radio structures interpreted first as immature radio jets, and then as consequences of an AGN-driven radiative outflow, and compare them to two criteria for successful feedback: the ability to remove the CO-derived molecular gas mass from the galaxy gravitational potential and the kinetic energy transfer to molecular clouds leading to v(cloud) > sigma(*). In most cases, the jet interpretation is insufficient to provide the energy necessary to cause the star formation suppression. Conversely, the wind interpretation provides ample energy in all but one case. We conclude that it is more likely that the observed suppression of star formation in the global host galaxy is due to interstellar medium interactions of a radiative outflow, rather than a small-scale radio jet.
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    The Black Hole-Galaxy Connection: Interplay between Feedback, Obscuration, and Host Galaxy Substructure
    (2022) Juneau, Stephanie; Goulding, Andy D.; Banfield, Julie; Bianchi, Stefano; Duc, Pierre-Alain; Ho, I-Ting; Dopita, Michael A.; Scharwaechter, Julia; Bauer, Franz E.; Groves, Brent; Alexander, David M.; Davies, Rebecca L.; Elbaz, David; Freeland, Emily; Hampton, Elise; Kewley, Lisa J.; Nikutta, Robert; Shastri, Prajval; Shu, Xinwen; Vogt, Frederic P. A.; Wang, Tao; Wong, O. Ivy; Woo, Jong-Hak
    There is growing evidence for physical influence between supermassive black holes and their host galaxies. We present a case study of the nearby galaxy NGC 7582, for which we find evidence that galactic substructure plays an important role in affecting the collimation of ionized outflows as well as contributing to the heavy active galactic nucleus (AGN) obscuration. This result contrasts with a simple, small-scale AGN torus model, according to which AGN-wind collimation may take place inside the torus itself, at subparsec scales. Using 3D spectroscopy with the Multi Unit Spectroscopic Explorer instrument, we probe the kinematics of the stellar and ionized gas components as well as the ionization state of the gas from a combination of emission-line ratios. We report for the first time a kinematically distinct core (KDC) in NGC 7582, on a scale of similar to 600 pc. This KDC coincides spatially with dust lanes and starbursting complexes previously observed. We interpret it as a circumnuclear ring of stars and dusty, gas-rich material. We obtain a clear view of the outflowing cones over kiloparsec scales and demonstrate that they are predominantly photoionized by the central engine. We detect the back cone (behind the galaxy) and confirm previous results of a large nuclear obscuration of both the stellar continuum and H ii regions. While we tentatively associate the presence of the KDC with a large-scale bar and/or a minor galaxy merger, we stress the importance of gaining a better understanding of the role of galaxy substructure in controlling the fueling, feedback, and obscuration of AGNs.