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Star Scheduling Mode—A New Observing Strategy for Monitoring Weak Southern Radio Sources with the AuScope VLBI Array

  • Lucia McCallum (a1), David Mayer (a2), Karine Le Bail (a3), Matthias Schartner (a2), Jamie McCallum (a1), Jim Lovell (a1), Oleg Titov (a4), Fengchun Shu (a5) and Sergei Gulyaev (a6)...
Abstract
Abstract

The International Celestial Reference Frame suffers from significantly less observations in the southern hemisphere compared to the northern one. One reason for this is the historically low number of very long baseline interferometry radio telescopes in the south. The AuScope very long baseline interferometry array with three new telescopes on the Australian continent and an identical antenna in New Zealand were built to address this issue. While the overall number of observations in the south has greatly improved since then, a closer look reveals that this improvement is only true for strong radio sources (source flux densities >0.6 Jy). The new array of small very long baseline interferometry antennas has a relatively low baseline sensitivity so that only strong sources can be observed within a short integration time. A new observing strategy, the star scheduling mode, was developed to enable efficient observations of weak sources during geodetic sessions, through the addition of a single more sensitive antenna to the network. This scheduling mode was implemented in the Vienna very long baseline interferometry Software and applied in four 24-h sessions in 2016. These observations provide updated positions and source flux densities for 42 weak southern radio sources and significantly reduce the formal uncertainties for these sources. The star scheduling mode now allows the AuScope very long baseline interferometry array to undertake greater responsibility in monitoring sources in the southern sky, without significantly weakening the session for geodetic purposes.

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Corresponding author
7 Email: Lucia.McCallum@utas.edu.au
References
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Böhm J., Böhm S., Nilsson T., Pany A., Plank L., Spicakova H., Teke K., & Schuh H. 2012, in Proc. 2009 IAG Symp., Geodesy for Planet Earth. International Association of Geodesy Symposia, eds. S. Kenyon, M. Pacino, & U. Marti (Berlin Heidelberg: Springer), 1007 10.1007/978-3-642-20338-1_126
Bourda G., Charlot P., Porcas R. W., & Garrington S. T. 2010, A&A, 520, A23 10.1051/0004-6361/201014248 2010A%26A. . .520A.113B
Bourda G., Collioud A., Charlot P., Porcas R., & Garrington S. 2011, A&A, 526, A102 10.1051/0004-6361/201014249 2011A%26A. . .526A.102B
Fey A., et al. 2015, AJ, 150, 58 10.1088/0004-6256/150/2/58
Gipson J. 2016, Goddard Space Flight Center Sked VLBI Scheduling Software, https://lupus.gsfc.nasa.gov/files_user_manuals/sked/SkedManual_v2016Dec09.pdf
Gipson J., & Baver K. 2016, JGeod, 90, 287 10.1007/s00190-015-0873-6
Le Bail K., et al. 2016, AJ, 151, 79
Lovell J., et al. 2013, JGeod, 87, 527
Ma C., et al. 2009, IERS Technical Note 35 (Frankfurt: Verlag des Bundesamts für Kartographie und Geodäsie)
Nothnagel A., Artz T., Behrend D., & Malkin Z. 2016, JGeod, 91, 711 10.1007/s00190-016-0950-5
Petrov L., Gordon D., Gipson J., MacMillan D., Ma C., Fomalont E., Craig Walker R., & Carabajal C. 2009, JGeod 10.1007/s00190-009-0304-7, 83, 859
Plank L., Lovell J., McCallum J., & Mayer D. 2016, in Proc. of IVS 2016 General Meeting, New Horizons with VGOS, eds. D. Behrend, K. D. Baver, & K. L. Armstrong (Greenbelt: NASA), 87
Plank L., Lovell J., Shabala O. S., Böhm J., & Titov O. 2015, AdSpR, 56, 304
Plank L., et al. 2017, JGeod, 91, 803 10.1007/s00190-016-0949-y
Shabala S., Rogers J. G., McCallum J. N., Titov O. A., Blanchard J., Lovell J. E. J., & Watson C. S. 2014, JGeod, 88, 575
Sun J. 2013, PhD thesis, Vienna University of Technology, Vienna, http://www.ub.tuwien.ac.at/diss/AC07814953.pdf
Sun J., Böhm J., Nilsson T., Krásná H., Böhm S., & Schuh H. 2014, JGeod, 88, 449
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Publications of the Astronomical Society of Australia
  • ISSN: 1323-3580
  • EISSN: 1448-6083
  • URL: /core/journals/publications-of-the-astronomical-society-of-australia
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