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A new era for low frequency Galactic center transient monitoring

机译:低频银河中心瞬态监测的新时代

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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.
机译:NRL和NRAO开发的VLA的低频观测系统升级,称为低频段(LB),将开启一段新的银河中心(GC)瞬态监测。我们以前的搜索使用VLA和GMRT透露了一个适度的无线电选择的瞬态数量,但已经严重敏感和观察时间限制。新的LB系统目前正在访问236-492 MHz频率范围,承诺≥5倍改善了传统VLA系统的灵敏度。新系统正在进行调试,以捕获G2云事件的任何增强的子GHz排放,我们根据最近的观察审查现有限制。我们还描述了一个提出的24/7个共谋系统,称为低频频段天文台(Lobo)。 Lobo每年提供超过100个VLA GC监控时间,可能会揭示新的瞬态,帮助验证Astro2010预期瞬态射频天文的新时代。涉及VLA低频电离层和瞬态实验(VLITE)的资助的Lobo探测器正在开发中。最后,我们考虑LB和Lobo对我们的GC监控计划的影响。

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