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A new era for low frequency Galactic center transient monitoring

Published online by Cambridge University Press:  22 May 2014

N. E. Kassim
Affiliation:
Naval Research Laboratory, Washington, DC, United States email: namir.kassim@nrl.navy.mil
S. D. Hyman
Affiliation:
Dept. of Physics, Sweet Briar College, Sweet Briar, Virginia email: sdhyman@sbc.edu
H. Intema
Affiliation:
National Radio Astronomy Observatory, Socorro, New Mexico email: hintema@nrao.edu
T. J. W. Lazio
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology Pasadena, California email: joseph.lazio@jpl.nasa.gov
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Abstract

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An upgrade of the low frequency observing system of the VLA developed by NRL and NRAO, called low band (LB), will open a new era of Galactic center (GC) transient monitoring. Our previous searches using the VLA and GMRT have revealed a modest number of radio-selected transients, but have been severely sensitivity and observing time limited. The new LB system, currently accessing the 236--492 MHz frequency range, promises ≥5 × improved sensitivity over the legacy VLA system. The new system is emerging from commissioning in time to catch any enhanced sub-GHz emission from the G2 cloud event, and we review existing limits based on recent observations. We also describe a proposed 24/7 commensal system, called the LOw Band Observatory (LOBO). LOBO offers over 100 VLA GC monitoring hours per year, possibly revealing new transients and helping validate ASTRO2010's anticipation of a new era of transient radio astronomy. A funded LOBO pathfinder called the VLA Low Frequency Ionosphere and Transient Experiment (VLITE) is under development. Finally, we consider the impact of LB and LOBO on our GC monitoring program.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2014 

References

Clarke, T. E., Kassim, N. E., Hicks, B. C., Owen, F. N., Durand, S., Kutz, C., Pospieszalski, M., Perley, R. A., Weiler, K. W., & Wilson, T. L. 2011, MmSAI 82, 664Google Scholar
Gillessen, S., Genzel, R., Fritz, T. K., et al. 2012, Nature 481, 51CrossRefGoogle Scholar
Hyman, S. D., Wijnands, R., Lazio, T. J. W., Pal, S., Starling, R., Kassim, N. E., & Ray, P. S. 2009, ApJ 696, 280CrossRefGoogle Scholar
Kassim, N. E., Hyman, S. D., Intema, H., Clarke, T. E., & Subrahmanyan, R. 2013, ATEL 4922Google Scholar
Narayan, R., Özel, F., & Sironi, L. 2012, ApJ Lett. 757, L20CrossRefGoogle Scholar
Roy, N. & Kanekar, N. 2013, ATEL 5323Google Scholar
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