A subarcsec localized fast radio burst with a significant host galaxy dispersion measure contribution
A subarcsec localized fast radio burst with a significant host galaxy dispersion measure contribution
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亚角秒局域快速射电暴，对主星系色散测量有显着贡献
DOI：
10.1093/mnras/stad1839
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发表时间：
2023
影响因子：
4.8
通讯作者：
Cavallaro, F.
中科院分区：
文献类型：
--
作者：
Caleb, M.;Driessen, L. N.;Gordon, A. C.;Tejos, N.;Bernales, L.;Qiu, H.;Chibueze, J. O.;Stappers, B. W.;Rajwade, K. M.;Cavallaro, F.
我们目前发现FRB 20210410 D与MeerKAT无线电干涉仪在南非，作为MeerTRAP卫星项目的一部分。FRB 20210410 D的色散量DM = 578.78 ± 2，在由相关数据产品制成的2s图像中定位到亚弧秒精度。这种定位使FRB与光学星系atz= 0.1415相关联，当与DM结合时，它将超过Macquart关系的3σ散射。我们将多余的DM归因于宿主星系，在考虑了银河系的星际介质和晕的贡献以及星系间介质和居间星系的综合影响后。这是第一个与矮星系无关的FRB，表现出可能的大宿主星系DM贡献。我们在FRB位置没有探测到任何连续射电辐射，或者从宿主星系到3σ rms为14.4Jy束-1。FRB在1GHz处具有ms的散射延迟，并且在频谱中显示出候选子脉冲，这暗示它可能是重复的FRB。虽然没有限制，但我们注意到，在MeerKAT的1.3 GHz下，该FRB在7.28 h内没有重复，在Murriyang的2.4 GHz下没有重复3 h，在深空网络的2.3 GHz和8.4 GHz同时观测时没有重复5.7 h。我们鼓励进一步采取后续行动，以确定可能的重复性质。
We present the discovery of FRB 20210410D with the MeerKAT radio interferometer in South Africa, as part of the MeerTRAP commensal project. FRB 20210410D has a dispersion measure DM = 578.78 ± 2and was localized to subarcsec precision in the 2 s images made from the correlation data products. The localization enabled the association of the FRB with an optical galaxy atz= 0.1415, which when combined with the DM places it above the 3σ scatter of the Macquart relation. We attribute the excess DM to the host galaxy after accounting for contributions from the Milky Way’s interstellar medium and halo, and the combined effects of the intergalactic medium and intervening galaxies. This is the first FRB that is not associated with a dwarf galaxy to exhibit a likely large host galaxy DM contribution. We do not detect any continuum radio emission at the FRB position or from the host galaxy down to a 3σ rms of 14.4Jy beam−1. The FRB has a scattering delay ofms at 1 GHz, and exhibits candidate subpulses in the spectrum, which hint at the possibility of it being a repeating FRB. Although not constraining, we note that this FRB has not been seen to repeat in 7.28 h at 1.3 GHz with MeerKAT, 3 h at 2.4 GHz with Murriyang, and 5.7 h at simultaneous 2.3 GHz and 8.4 GHz observations with the Deep Space Network. We encourage further follow-up to establish a possible repeating nature.