Welcome to KwangHo Park‘s home page!

Hi! I am an astrophysicist who studies the growth and feedback of massive black holes using radiation-hydrodynamic simulations. I have been working as TCAN (Theoretical Computational Astrophysics Network) postdoc at CRA (Center for Relativistic Astrophysics in School of Physics) of Georgia Tech since 2014 working with Prof. Bogdanovic and Prof. Wise.

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

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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
A 2D simulation from Park & Ricotti (2012) which shows the gas density (top) and ionization fraction (bottom) for a BH with 100 solar mass, gas density 1.e6 cm−3, and temperature of 10,000 K.  The collapse of an ionization front onto the BH leads to a burst of accretion luminosity.

hii
A 3D simulation from Park, Wise, & Bogdanović (2017) “Radiation-driven turbulent accretion onto massive black holes”, ApJ, in press, arXiv:1704.07864

Refereed Publications

  • Park, K., Wise, J. H., & Bogdanović, T., “Radiation-driven Turbulent Accretion onto Massive Black Holes”, 2017, ApJ, in press, 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, ApJ, 846, 3
  • 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

kwangho1

Please click the following link to download my CV

cv_kpark