Deep Synoptic Array Science: Discovery of the Host Galaxy of FRB 20220912A
Deep Synoptic Array Science: Discovery of the Host Galaxy of FRB 20220912A
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DOI：
10.3847/2041-8213/acc4b6
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
V. Ravi;M. Catha;G. Chen;L. Connor;J. Faber;J. Lamb;G. Hallinan;Charlie Harnach;G. Hellbourg-G.
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文献类型：
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作者：
V. Ravi;M. Catha;G. Chen;L. Connor;J. Faber;J. Lamb;G. Hallinan;Charlie Harnach;G. Hellbourg-G.
报道了在深空天气台阵(DSA-110)的调试观测过程中，对重复快速射电爆发(FRB)源FRB 20220912A的探测和干涉定位。从FRB 20220912A探测到两个脉冲串，分别发生在2022年10月18日和2022年10月25日。最适合的职位是(R.A.J2000，J2000)=(23：09：04.9，+48：42：25.4)，半径分别为±2“和±1”的90%置信度误差椭圆。这两个爆发是极化的，我们发现一个法拉第旋转量与CHME/FRB报道的+0.6rad m−2的低值一致。DSA110的定位与PSOJ347.2702+48.7066星系在红移z=0.0771处重叠，我们认为这是可能的宿主。PSOJ347.2702+48.7066具有大约1010M⊙的恒星质量，适度的内部尘埃消光，恒星形成率可能超过0.1M⊙yr−1。宿主星系对弥散测量的贡献可能是≲50pC cm−3。因此，FRB20220912A源可能是沿着穿过宿主星系的细小等离子体柱观察的。
We report the detection and interferometric localization of the repeating fast radio burst (FRB) source FRB 20220912A during commissioning observations with the Deep Synoptic Array (DSA-110). Two bursts were detected from FRB 20220912A, one each on 2022 October 18 and 2022 October 25. The best-fit position is (R.A. J2000, decl. J2000) = (23:09:04.9, +48:42:25.4), with a 90% confidence error ellipse with radii ±2″ and ±1″ in R.A. and decl., respectively. The two bursts are polarized, and we find a Faraday rotation measure that is consistent with the low value of +0.6 rad m−2 reported by CHIME/FRB. The DSA-110 localization overlaps with the galaxy PSO J347.2702+48.7066 at a redshift z = 0.0771, which we identify as the likely host. PSO J347.2702+48.7066 has a stellar mass of approximately 1010 M ⊙, modest internal dust extinction, and a star formation rate likely in excess of 0.1 M ⊙ yr−1. The host-galaxy contribution to the dispersion measure is likely ≲50 pc cm−3. The FRB 20220912A source is therefore likely viewed along a tenuous plasma column through the host galaxy.