Transient study using LoTSS - framework development and preliminary results

Iris de Ruiter

doi:10.1093/mnras/stae1458

2024-06-11

DOI：10.1093/mnras/stae1458

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We present a search for transient radio sources on time-scales of seconds to hours at 144 MHz using the LOFAR Two-metre Sky Survey (LoTSS). This search is conducted by examining short time-scale images derived from the LoTSS data. To allow imaging of LoTSS on short time-scales, a modern imaging procedure and fast filtering strategy are introduced. This includes sky model source subtraction, no cleaning or primary beam correction, a simple source finder, fast filtering schemes, and source catalogue matching. This new strategy is first tested by injecting simulated transients, with a range of flux densities and durations, into the data. We find the limiting sensitivity to be 113 and 6 mJy for 8 s and 1 h transients, respectively. The new imaging and filtering strategies are applied to 58 fields of the LoTSS survey, corresponding to LoTSS-DR1 (2 per cent of the survey). One transient source is identified in the 8 s and 2 min snapshot images. The source shows 1 min duration flare in the 8 h observation. Our method puts the most sensitive constraints on/estimates of the transient surface density at low frequencies at time-scales of seconds to hours; <4.0 x 10(-4) deg(-2) at 1 h at a sensitivity of 6.3 mJy; 5.7 x 10(-7) deg(-2) at 2 min at a sensitivity of 30 mJy; and 3.6 x 10(-8) deg(-2) at 8 s at a sensitivity of 113 mJy. In the future, we plan to apply the strategies presented in this paper to all LoTSS data.

Keyword:

techniques: image processing

surveys

software: data analysis

radio continuum: transients

期刊

Monthly Notices of the Royal Astronomical Society

IF:

4.8

论文数:

7.1W

被引数:

25.0W

机构

University of Erlangen Nuremberg

学者数:

3.2W

论文数: 2.6W

被引数: 29

university of amsterdam

学者数:

6.0W

论文数: 5.1W

被引数: 94

Helmholtz Association

学者数:

13.2W

论文数: 10.7W

被引数: 145

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