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Prof Hartmut Winkler

Prof. Hartmut Winkler

Professor
Name: Hartmut Winkler
Location: C1 Lab 241 Auckland Park Kingsway Campus
Physics Academic Staff听 Staff Members

Contact Details:
Tel: 011 559 4417

Email:听hwinkler@uj.ac.za

About Prof. Hartmut Winkler

NRF Rating: C2

Research Interests

Prof Winkler鈥檚 scientific work is split between two foci of interest:

  1. Atmospheric Physics and Energy: Solar irradiation, aerosols, interaction between radiation and aerosols, solar energy, the South African energy landscape
    Prof Winkler is developing higher-accuracy models to quantify (on a site-specific basis) the solar radiation collected by a range of solar power technologies, including photovoltaic panels and parabolic troughs. In particular these models consider the impact of aerosols and atmospheric pressure profiles on the light path, attenuation and scattering, leading to improved, light wavelength-specific insolation parameters. Model parameters are in most cases expressly tailored to describe the conditions at South African sites, and thus provide site diagnostics for potential solar power station developments. The same physics also translates to astronomical sky brightness calculations, and has been used to develop a night sky characterisation at the South African Astronomical Observatory. Prof Winkler has also a well-known commentator on energy scenarios South Africa, especially in the debate of renewable energy versus nuclear.
  2. Astrophysics: Active Galactic Nuclei (AGN), in particular Seyfert galaxies 鈥� spectral properties, classification, variability, optical photometry
    Prof Winkler devised and developed the flux variation gradient method for determining the obscuration and intrinsic luminosity of Seyfert nuclei. He has also been engaged and published in a multitude of projects in different branches of astronomy, including the determination of intrinsic infrared colours of B-stars, an analysis of the spectra of B[e] stars, the large scale structure of the universe, several novae, supernova 1987a, symbiotic stars and cataclysmic variables. He has been part of several recent international AGN reverberation mapping campaigns, X-ray source identification and searches for 鈥渃hanging look鈥� AGN. He has developed (and is continuously updating) the ZAC database of AGN optical spectra and luminosities, and devising a more sophisticated spectral classification system for AGN.

For more detailed information, please visit Professor Hartmut Winkler鈥檚 or for an overview of his research click

Authored or co-authored articles:

  • 听 64 articles in scientific journals (56 subsidised & peer reviewed; 17 as first author)
  • 听听听 50 articles in conference proceedings. Click to view the list and access the articles
  • 听听听 Presented nine oral and five poster papers at international conferences
  • 听听听 Numerous scientific talks, including sixteen overseas

Awards:

  • 听听听 Matsumae International Foundation Fellowship 鈥� Apr-Sep 1996
  • 听听听 DAAD Research Grant 鈥� May-Jul 2011

Recent Publications:

  1. Edelson R, Gelbord J, Cackett E, 鈥� + 39 others 鈥�, Winkler H, Zheng W, 2017: 鈥楽WIFT monitoring of NGC 4151: Evidence for a second x-ray/UV reprocessing鈥�, Astrophys. J. 840, A41 [arXiv astro-ph 1703.06901]
  2. Fausnaugh MM, Grier CJ, Bentz MC, 鈥� + 66 others 鈥�, Winkler H, Zhu W, 2017: 鈥楻everberation mapping of optical emission lines in five active galaxies鈥�, Astrophys. J. 840, A97 [arXiv astro-ph 1610.00008]
  3. Pancoast A, Barth AJ, Horne K, 鈥�+ 23 others 鈥�, Winkler H, 2018: 鈥楽tability of the broad line region geometry and dynamics in Arp 151 over seven years鈥�, Astrophys. J. 856, A108 [arXiv astro-ph 1803.02318]
  4. Oknyansky VL, Winkler H, Tsygankov SS, Lipunov VM, Gorbovskoy ES, Van Wyk F, Buckley DAH, Tyurina NV, 2019: 鈥楴ew changing look case in NGC 1566鈥�, Monthly Notices Roy. Astron. Soc. 483, 558 [arXiv astro-ph 1811.06926]
  5. Landt H, Ward MJ, Kynoch D, 鈥� + 15 others 鈥� Winkler H, 2019: 鈥楾he first spectroscopic dust reverberation programme on active galactic nuclei: the torus in NGC 5548鈥�, Monthly Notices Roy. Astron. Soc. 489, 1572 [arXiv astro-ph 1908.01627]
  6. Hu C, Li YR, Du P, 鈥� + 11 others 鈥�, Winkler H, 鈥�, 2020: 鈥楤road-line region of the quasar PG 2130+099 from a two-year reverberation mapping campaign with high cadence鈥�, Astrophys. J. 890, A70 [arXiv astro-ph 2001.03086]
  7. Oknyansky VL, Winkler H, Tsygankov SS, Lipunov VM, Gorbovskoy ES, van Wyk F, Buckley DAH, Jiang BW, Tyurina NV, 2020: 鈥楾he post-maximum behaviour of the changing look Seyfert galaxy NGC 1566鈥�, Monthly Notices Roy. Astron. Soc. 498, 718 [arXiv astro-ph 2006.00001]
  8. Hu C, Li SS, Guo WJ, 鈥� + 13 others 鈥�, Winkler H, Wang JM, 2021: 鈥楻everberation mapping results for 15 PG quasars from a long-duration high-cadence campaign鈥�, Astrophys. J. Suppl. 253, A20
  9. Winkler H, 2022: 鈥楢 revised simplified scattering model for the moonlit sky brightness profile based on photometry at SAAO鈥�, Monthly Notices Roy. Astron. Soc. 514, 208 [arXiv astro-ph 2205.07773]
  10. Paul B, Winkler H, Potter SB, 2022: 鈥楾he analysis of the iron-rich spectra of a sample of Narrow-line Seyfert 1 galaxies鈥�, Monthly Notices Roy. Astron. Soc. 516, 2374
  11. Kollatschny W, Grupe D, Parker ML, Ochmann MW, Schartel N, Romero-Colmenero E, Winkler H, Komossa S, Famula P, Probst MA, Santos-Lleo M, 2023: 鈥楾he outburst of the changing-look AGN IRAS 23226-3843 in 2019鈥�, Astron. Astrophys. 670, A103 [arXiv Astro-ph 2212.07270]
  12. Landt H, Mitchell JAJ, Ward MJ, 鈥� + 8 others 鈥� Winkler H, 2023: 鈥楢 complex morphology in the high-luminosity AGN Mrk 876鈥�, Astrophys. J. 945, A62 [arXiv astro-ph 2302.01678]
  13. Miller JA, Cackett EM, Goad MR, 鈥� + 8 others 鈥� Winkler H, 2023: 鈥楥ontinuum reverberation mapping of Mrk 876. Over three years with remote robotic observatories鈥�, Astrophys. J. 953, A137
  14. Markowitz A, Krumpe M, Homan D, 鈥� + 12 others 鈥� Winkler H, 鈥�, 2024: 鈥榚ROSITA detection of a cloud obscuration event in the Seyfert AGN EC 04570-5206鈥�, Astron. Astrophys. 684, A101
  15. Li YR, C Hu, ZH Yao, 鈥� + 17 others 鈥� Winkler H, 鈥�, 2024: 鈥楽pectroastrometry and Reverberation Mapping (SARM) of Active Galactic Nuclei. I. The H尾 broad-line region structure and black hole mass of five quasars鈥�, Astrophys. J. 974, A86 [arXiv astro-ph 2407.08120]

MOST SIGNIFICANT PUBLICATIONS

1992: 鈥淰ariability studies of Seyfert galaxies. I Broad band optical photometry鈥�, Winkler H, Glass IS, Van Wyk F, Marang F, Spencer Jones JH, Buckley DAH, Sekiguchi K, Monthly Notices Roy. Astron. Soc. 257, 659-676 (96 citations)

1992: 鈥淰ariability studies of Seyfert galaxies. II Spectroscopy鈥�, Winkler H, Monthly Notices Roy. Astron. Soc. 257, 677-688 (142 citations)

1997: 鈥淩ed and infrared colours of B-stars and the reddening law in the Galaxy鈥�, Winkler H, Monthly Notices Roy. Astron. Soc., 287, 481-494 (64 citations)

1997: 鈥淭he extinction, flux distribution and luminosity of Seyfert 1 nuclei derived from UBV(RI)c aperture photometry鈥�, Winkler H, Monthly Notices Roy. Astron. Soc., 292, 273-288 (48 citations)

2022: 鈥淎 revised simplified scattering model for the moonlit sky brightness profile based on the photometry at SAAO鈥�, Monthly Notices Roy. Astron. Soc. 514, 208-226 (2 citations)

External Links

ORCID ID: 0000-0003-2662-0526