A bright long-period radio transient shows periodic X-ray emission at the same 44.2-minute period, making it the first LPT detected in X-rays and establishing a new class of hour-scale periodic X-ray transients.
A Measurement of Source Noise at Low Frequency: Implications for Modern Interferometers
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abstract
We report on the detection of source noise in the time domain at 162MHz with the Murchison Widefield Array. During the observation the flux of our target source Virgo A (M87) contributes only $\sim$1\% to the total power detected by any single antenna, thus this source noise detection is made in an intermediate regime, where the source flux detected by the entire array is comparable with the noise from a single antenna. The magnitude of source noise detected is precisely in line with predictions. We consider the implications of source noise in this moderately strong regime on observations with current and future instruments.
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Detection of X-ray Emission from a Bright Long-Period Radio Transient
A bright long-period radio transient shows periodic X-ray emission at the same 44.2-minute period, making it the first LPT detected in X-rays and establishing a new class of hour-scale periodic X-ray transients.