Dr Helen Johnston

A28 - Physics Building
The University of Sydney

Telephone +61 2 9036 9259
Fax +61 2 9351 7726

Research interests

Member of The Sydney Institute for Astronomy (SIfA).SIfA scientists conduct research in many exciting frontline areas including stellar astrophysics, plasma astrophysics, cataclysmic variables, black-hole binaries, masers, pulsars, supernovae and their remnants, the interstellar medium and the Galactic Centre. Beyond our Galaxy, we study normal galaxies, the Magellanic Clouds, clusters of galaxies, active galaxies & quasars, gravitational lensing and cosmology.

Selected grants

2007

  • The environments of massive galaxies; Johnston H; Australian Nuclear Science and Technology Organisation/Access to Major Research Facilities Program.

Selected publications

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Journals

  • Anderson, C., Johnston, H., Hunstead, R. (2013). Galactic interaction as the trigger for the young radio galaxy MRC B1221-423. Monthly Notices of the Royal Astronomical Society, 431(4), 3269-3281. [More Information]
  • Titov, O., Stanford, L., Johnston, H., Pursimo, T., Hunstead, R., Jauncey, D., Maslennikov, K., Boldycheva, A. (2013). Optical spectra of candidate international celestial reference frame (ICRF) flat-spectrum radio sources. The Astronomical Journal, 146(1), 1-10. [More Information]
  • Saripalli, L., Subrahmanyan, R., Thorat, K., Ekers, R., Hunstead, R., Johnston, H., Sadler, E. (2012). ATLBS extended source sample: The evolution in radio source morphology with flux density. The Astrophysical Journal Supplement Series, 199(2), 1-13. [More Information]
  • Mahony, E., Sadler, E., Croom, S., Ekers, R., Bannister, K., Chhetri, R., Hancock, P., Johnston, H., Massardi, M., Murphy, T. (2011). Optical properties of high-frequency radio sources from the Australia Telescope 20 GHz (AT20G) Survey. Monthly Notices Royal Astronomical Society, 417(4), 2651-2675. [More Information]
  • Titov, O., Jauncey, D., Johnston, H., Hunstead, R., Christensen, L. (2011). Optical Spectra of Candidate Southern Hemisphere International Celestial Reference Frame (ICRF) Radio Sources. The Astrophysical Journal Letters, 142(5), 1-10. [More Information]
  • Sarty, G., Pilecki, B., Reichart, D., Ivarsen, K., Haislip, J., Nysewander, M., LaCluyze, A., Johnston, H., Shobbrook, R., Kiss, L., Wu, K. (2011). Photometric observations of three high mass X-ray binaries and a search for variations induced by orbital motion. Research in Astronomy and Astrophysics, 11(8), 947-964. [More Information]
  • Sarty, G., Szalai, T., Kiss, L., Matthews, J., Wu, K., Kuschnig, R., Guenther, D., Moffat, A., Rucinski, S., Sasselov, D., Johnston, H., et al (2011). The (gamma)-ray binary LS 5039: mass and orbit constraints from MOST observations. Monthly Notices Royal Astronomical Society, 411(2), 1293-1300. [More Information]
  • Johnston, H., Broderick, J., Cotter, G., Morganti, R., Hunstead, R. (2010). The extraordinary radio galaxy MRC B1221-423: Probing deeper at radio and optical wavelengths. Monthly Notices Royal Astronomical Society, 407(2), 721-733.
  • Sharma, M., Johnston, I., Johnston, H., Varvell, K., Robertson, J., Hopkins, A., Stewart, C., Cooper, I., Thornton, R. (2010). Use of interactive lecture demonstrations: A ten year study. Physical Review Special Topics - Physics Education Research, 6(2), 020119-1-020119-9.
  • Bryant, J., Broderick, J., Johnston, H., Hunstead, R., Gaensler, B., De Breuck, C. (2009). A new search for distant radio galaxies in the Southern hemisphere - II. 2.2m imaging*. Monthly Notices Royal Astronomical Society, 394(4), 2197-2222. [More Information]
  • Bryant, J., Johnston, H., Broderick, J., Hunstead, R., De Breuck, C., Gaensler, B. (2009). A new search for distant radio galaxies in the Southern hemisphere - III. Optical spectroscopy and analysis of the MRCR - SUMSS sample. Monthly Notices Royal Astronomical Society, 395(2), 1099-1120. [More Information]
  • Sarty, G., Kiss, L., Huziak, R., Catalan, L., Luciuk, D., Crawford, T., Lane, D., Pickard, R., Grzybowski, T., Closas, P., Johnston, H., et al (2009). Periodicities in the high-mass X-ray binary system RX J0146.9+6121/LSI+61º235. Monthly Notices Royal Astronomical Society, 392(3), 1242-1252.
  • Johnston, H., Sadler, E., Cannon, R., Croom, S., Ross, N., Schneider, D. (2008). Radio galaxies in the 2SLAQ Luminous Red Galaxy survey - II. The stellar populations of radio-loud and radio-quiet LRGs. Monthly Notices Royal Astronomical Society, 384(2), 692-700.
  • Wake, D., Croom, S., Sadler, E., Johnston, H. (2008). The clustering of radio galaxies at z ≃ 0.55 from the 2SLAQ LRG survey. Monthly Notices Royal Astronomical Society, 391, 1674-1684.
  • Sadler, E., Cannon, R., Mauch, T., Hancock, P., Wake, D., Ross, N., Croom, S., Drinkwater, M., Edge, A., Eisenstein, D., Hopkins, A., Johnston, H., et al (2007). Radio galaxies in the 2SLAQ Luminous Red Galaxy Survey - I. The evolution of low-power radio galaxies to z similar to 0.7. Monthly Notices Royal Astronomical Society, 381(1), 211-227.
  • Johnston, H., Hopkins, A., Varvell, K., Sharma, M., Thornton, R. (2007). The research-teaching nexus in physics: scholarship into teaching and learning. Australian Physics, 44(2), 66-70.
  • De Breuck, C., Klamer (Feain), I., Johnston, H., Hunstead, R., Bryant, J., Rocca-Volmerange, B., Sadler, E. (2006). A search for distant radio galaxies from SUMSS and NVSS - II. Optical spectroscopy. Monthly Notices Royal Astronomical Society, 366(1), 58-72.
  • Johnston, H., Hunstead, R., Cotter, G., Sadler, E. (2005). MRC B1221-423: a compact steep-spectrum radio source in a merging galaxy. Monthly Notices Royal Astronomical Society, 356(2), 515-523.
  • Fender, R., Wu, K., Johnston, H., Tzioumis, T., Jonker, P., Spencer, R., van der Klis, M. (2004). An Ultra-Relativistic Outflow From A Neutron Star Accreting Gas From A Companion. Nature, 427(6971), 222-224.
  • Jauncey, D., Johnston, H., Bignall, H., Lovell, J., Kedzioa-Chudczer, L., Tzioumis, A., Macquart, J. (2003). Interstellar scintillation and annual cycles in the BL Lac source PKS 1519-273. Astrophysics and Space Science, 288(1-2), 63-68.
  • Wu, K., Campbell-Wilson, D., Hunstead, R., Johnston, H., McIntyre, V., Soria, R., Hannikainen, D., Harmon, B., McCollough, M. (2002). The 1998 Outburst of the XTE J1550-564: A model based on multiwavelength observations. The Astrophysical Journal, 565(2), 1161-1168.
  • Johnston, H., Wu, K., Fender, R., Cullen, J. (2001). Secular and orbital variability of Cir X-1 observed in optical spectra. Monthly Notices Royal Astronomical Society, Vol 328(4), 1193-1199.

Conferences

  • Hill, M., Sharma, M., Johnston, H. (2013). Developing representational skills through weekly online learning modules for first-year undergraduate physics students. 19th Annual UniServe Science Conference: Australian Conference on Science and Mathematics Education (ACSME), The University of Sydney: Uniserve Science.
  • Johnston, H., Hunstead, R., Sadler, E., Cotter, G., Morganti, R. (2004). MRC B1221-423: Forming an AGN in a merger. IAU Symposium, No. 222, UK: Cambridge University Press.
  • Wu, K., Soria, R., Johnston, H., Hunstead, R. (2002). Formation of optical lines in black-hole binaries. The Ninth Marcel Grossmann Meeting, Singapore: World Scientific Publishing.

2013

  • Hill, M., Sharma, M., Johnston, H. (2013). Developing representational skills through weekly online learning modules for first-year undergraduate physics students. 19th Annual UniServe Science Conference: Australian Conference on Science and Mathematics Education (ACSME), The University of Sydney: Uniserve Science.
  • Anderson, C., Johnston, H., Hunstead, R. (2013). Galactic interaction as the trigger for the young radio galaxy MRC B1221-423. Monthly Notices of the Royal Astronomical Society, 431(4), 3269-3281. [More Information]
  • Titov, O., Stanford, L., Johnston, H., Pursimo, T., Hunstead, R., Jauncey, D., Maslennikov, K., Boldycheva, A. (2013). Optical spectra of candidate international celestial reference frame (ICRF) flat-spectrum radio sources. The Astronomical Journal, 146(1), 1-10. [More Information]

2012

  • Saripalli, L., Subrahmanyan, R., Thorat, K., Ekers, R., Hunstead, R., Johnston, H., Sadler, E. (2012). ATLBS extended source sample: The evolution in radio source morphology with flux density. The Astrophysical Journal Supplement Series, 199(2), 1-13. [More Information]

2011

  • Mahony, E., Sadler, E., Croom, S., Ekers, R., Bannister, K., Chhetri, R., Hancock, P., Johnston, H., Massardi, M., Murphy, T. (2011). Optical properties of high-frequency radio sources from the Australia Telescope 20 GHz (AT20G) Survey. Monthly Notices Royal Astronomical Society, 417(4), 2651-2675. [More Information]
  • Titov, O., Jauncey, D., Johnston, H., Hunstead, R., Christensen, L. (2011). Optical Spectra of Candidate Southern Hemisphere International Celestial Reference Frame (ICRF) Radio Sources. The Astrophysical Journal Letters, 142(5), 1-10. [More Information]
  • Sarty, G., Pilecki, B., Reichart, D., Ivarsen, K., Haislip, J., Nysewander, M., LaCluyze, A., Johnston, H., Shobbrook, R., Kiss, L., Wu, K. (2011). Photometric observations of three high mass X-ray binaries and a search for variations induced by orbital motion. Research in Astronomy and Astrophysics, 11(8), 947-964. [More Information]
  • Sarty, G., Szalai, T., Kiss, L., Matthews, J., Wu, K., Kuschnig, R., Guenther, D., Moffat, A., Rucinski, S., Sasselov, D., Johnston, H., et al (2011). The (gamma)-ray binary LS 5039: mass and orbit constraints from MOST observations. Monthly Notices Royal Astronomical Society, 411(2), 1293-1300. [More Information]

2010

  • Johnston, H., Broderick, J., Cotter, G., Morganti, R., Hunstead, R. (2010). The extraordinary radio galaxy MRC B1221-423: Probing deeper at radio and optical wavelengths. Monthly Notices Royal Astronomical Society, 407(2), 721-733.
  • Sharma, M., Johnston, I., Johnston, H., Varvell, K., Robertson, J., Hopkins, A., Stewart, C., Cooper, I., Thornton, R. (2010). Use of interactive lecture demonstrations: A ten year study. Physical Review Special Topics - Physics Education Research, 6(2), 020119-1-020119-9.

2009

  • Bryant, J., Broderick, J., Johnston, H., Hunstead, R., Gaensler, B., De Breuck, C. (2009). A new search for distant radio galaxies in the Southern hemisphere - II. 2.2m imaging*. Monthly Notices Royal Astronomical Society, 394(4), 2197-2222. [More Information]
  • Bryant, J., Johnston, H., Broderick, J., Hunstead, R., De Breuck, C., Gaensler, B. (2009). A new search for distant radio galaxies in the Southern hemisphere - III. Optical spectroscopy and analysis of the MRCR - SUMSS sample. Monthly Notices Royal Astronomical Society, 395(2), 1099-1120. [More Information]
  • Sarty, G., Kiss, L., Huziak, R., Catalan, L., Luciuk, D., Crawford, T., Lane, D., Pickard, R., Grzybowski, T., Closas, P., Johnston, H., et al (2009). Periodicities in the high-mass X-ray binary system RX J0146.9+6121/LSI+61º235. Monthly Notices Royal Astronomical Society, 392(3), 1242-1252.

2008

  • Johnston, H., Sadler, E., Cannon, R., Croom, S., Ross, N., Schneider, D. (2008). Radio galaxies in the 2SLAQ Luminous Red Galaxy survey - II. The stellar populations of radio-loud and radio-quiet LRGs. Monthly Notices Royal Astronomical Society, 384(2), 692-700.
  • Wake, D., Croom, S., Sadler, E., Johnston, H. (2008). The clustering of radio galaxies at z ≃ 0.55 from the 2SLAQ LRG survey. Monthly Notices Royal Astronomical Society, 391, 1674-1684.

2007

  • Sadler, E., Cannon, R., Mauch, T., Hancock, P., Wake, D., Ross, N., Croom, S., Drinkwater, M., Edge, A., Eisenstein, D., Hopkins, A., Johnston, H., et al (2007). Radio galaxies in the 2SLAQ Luminous Red Galaxy Survey - I. The evolution of low-power radio galaxies to z similar to 0.7. Monthly Notices Royal Astronomical Society, 381(1), 211-227.
  • Johnston, H., Hopkins, A., Varvell, K., Sharma, M., Thornton, R. (2007). The research-teaching nexus in physics: scholarship into teaching and learning. Australian Physics, 44(2), 66-70.

2006

  • De Breuck, C., Klamer (Feain), I., Johnston, H., Hunstead, R., Bryant, J., Rocca-Volmerange, B., Sadler, E. (2006). A search for distant radio galaxies from SUMSS and NVSS - II. Optical spectroscopy. Monthly Notices Royal Astronomical Society, 366(1), 58-72.

2005

  • Johnston, H., Hunstead, R., Cotter, G., Sadler, E. (2005). MRC B1221-423: a compact steep-spectrum radio source in a merging galaxy. Monthly Notices Royal Astronomical Society, 356(2), 515-523.

2004

  • Fender, R., Wu, K., Johnston, H., Tzioumis, T., Jonker, P., Spencer, R., van der Klis, M. (2004). An Ultra-Relativistic Outflow From A Neutron Star Accreting Gas From A Companion. Nature, 427(6971), 222-224.
  • Johnston, H., Hunstead, R., Sadler, E., Cotter, G., Morganti, R. (2004). MRC B1221-423: Forming an AGN in a merger. IAU Symposium, No. 222, UK: Cambridge University Press.

2003

  • Jauncey, D., Johnston, H., Bignall, H., Lovell, J., Kedzioa-Chudczer, L., Tzioumis, A., Macquart, J. (2003). Interstellar scintillation and annual cycles in the BL Lac source PKS 1519-273. Astrophysics and Space Science, 288(1-2), 63-68.

2002

  • Wu, K., Soria, R., Johnston, H., Hunstead, R. (2002). Formation of optical lines in black-hole binaries. The Ninth Marcel Grossmann Meeting, Singapore: World Scientific Publishing.
  • Wu, K., Campbell-Wilson, D., Hunstead, R., Johnston, H., McIntyre, V., Soria, R., Hannikainen, D., Harmon, B., McCollough, M. (2002). The 1998 Outburst of the XTE J1550-564: A model based on multiwavelength observations. The Astrophysical Journal, 565(2), 1161-1168.

2001

  • Johnston, H., Wu, K., Fender, R., Cullen, J. (2001). Secular and orbital variability of Cir X-1 observed in optical spectra. Monthly Notices Royal Astronomical Society, Vol 328(4), 1193-1199.

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