Welcome to KwangHo Park‘s home page!

Hi! I am an astrophysicist studying the growth and feedback of black holes using radiation-hydrodynamic simulations. Currently, I am a TCAN (Theoretical Computational Astrophysics Network) postdoc at CRA (Center for Relativistic Astrophysics) of Georgia Tech working with Prof. Bogdanovic and Prof. Wise. I received my Ph.D. in 2012 from the University of Maryland at College Park under the supervision of Prof. Massimo Ricotti.

Employment
2014 – : TCAN (Theoretical Computational Astrophysics Network) postdoc
Center for Relativistic Astrophysics, Georgia Tech
2012 – 2014 : Urania E. Stott Postdoctoral Fellow
McWilliams Center for Cosmology, Carnegie Mellon Univ

Education
2012 : Ph.D., Univ. of Maryland, USA (advisor: Massimo Ricotti)
2005 : M.S., Astronomy, Yale Univ., USA
2002 : M.S., Astronomy, Yonsei Univ., Seoul, Korea
2000 : B.S., Astronomy, Yonsei Univ., Seoul, Korea

Contact info
Office: Boggs 1-34, Georgia Tech, Atlanta, GA 30332
Email: kwangho.park [at] physics [dot] gatech [dot] edu

Research

My main research topic is a gas accretion onto black holes (ranging from intermediate-mass to supermassive black holes) when the accretion is regulated by radiative & mechanical feedback. Mostly I run radiation-hydrodynamic simulations using ZEUS-MP or ENZO equipped with ray-tracing modules. My simulations provide an insight on the effect of heating by UV and X-ray radiation on the cold gas accretion, and allow us to estimate how rapidly the massive black holes can grow. The following movie below from Park & Ricotti (2012) is an example of simulation for 100 solar mass black hole accreting from dense gas reservoir with 1.e6 hydrogens per cm^3. Upper (bottom) panel shows gas density (ionization fraction). The formation of hot & low density bubble efficiently  regulates gas accretion onto the black hole showing a quasi-periodic behavior.

den_d6_small

Refereed Publications

  • Park, K., Wise, J. H., & Bogdanović, T., “Radiation-driven Turbulent Accretion onto Massive Black Holes”, 2017, arXiv:1704.07864
  • Yajima, H., Ricotti, M., Park, K., & Kazuyuki, S., “Dusty Gas Accretion onto Massive Black Holes and Infrared Diagnosis of the Eddington Ratio”, 2017, arXiv:1704.05567
  • Park, K. & Bogdanović, T., “Gaseous Dynamical Friction in Presence of Black Hole Radiative Feedback”, 2017, ApJ, 838, 103
  • Park, K., Ricotti, M., Natarajan, P., Bogdanović, T., & Wise, J. H. “Bulge-driven Fueling of Seed Black Holes”, 2016, ApJ, 818, 184
  • Park, K., Di Matteo, T., Ho, S., Croft, R., Wilkins, S., Feng, Y., & Khandai N., “Luminosity function of [OII] emission line galaxies in the MassiveBlack-II simulation”, 2015, MNRAS, 454, 269
  • Park, K., Ricotti, M., Di Matteo, T., & Reynolds, C., “The role of Compton heating in radiation-regulated accretion on to black holes”, 2014, MNRAS, 445, 2325
  • Park, K., Ricotti, M., Di Matteo, T., & Reynolds, C., “Rayleigh-Taylor instability of ionization front around black holes” , 2014, MNRAS, 437, 2856
  • Park, K., & Ricotti, M., “Accretion onto Black Holes from Large Scales Regulated by Radiative Feedback. III. Enhanced Luminosity of IMBHs Moving at Supersonic Speeds”, 2013, ApJ, 767, 163
  • Park, K., & Ricotti, M., “Accretion onto BHs Regulated by Radiative Feedback. II. Growth Rate and Duty Cycle”, 2012, ApJ, 747, 9
  • Park, K., & Ricotti, M.,  “Accretion onto IMBHs Regulated by Radiative Feedback. I. Parametric Study for Spherically Symmetric Accretion”, 2011, ApJ, 739, 2

Click here for my ADS (Astrophysics Data System) Author Query Results

CV

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Please click the following link to download my CV

cv_kpark