Deep Synoptic Array Science: A Massive Elliptical Host Among Two Galaxy-cluster Fast Radio Bursts
Deep Synoptic Array Science: A Massive Elliptical Host Among Two Galaxy-cluster Fast Radio Bursts
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DOI：
10.3847/1538-4357/accf1d
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发表时间：
2023-02
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影响因子：
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通讯作者：
K. Sharma;J. Somalwar;C. Law;V. Ravi;M. Catha;G. Chen;L. Connor;J. Faber;G. Hallinan
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作者：
K. Sharma;J. Somalwar;C. Law;V. Ravi;M. Catha;G. Chen;L. Connor;J. Faber;G. Hallinan
与快速射电暴（FRB）源相关的恒星种群环境为发展其祖先理论提供了重要的见解。我们通过报告深度天气阵列 (DSA-110) 在调试观测期间发现的两个巨大星系团中的快速射电暴，扩大了已知快速射电暴宿主环境的多样性。 FRB 20220914A 被定位于 A2310 星系团中红移为 0.1139 的恒星形成晚期星系，在回顾时间小于 ∼3.5 Gyr 的情况下发生多次星暴。虽然 FRB 20220914A 的宿主星系与典型的 FRB 宿主相似，但 FRB 20220509G 宿主在 A2311 星系团中作为静止的早期型星系脱颖而出，红移为 0.0894。在晚型和早型星系中发现的 FRB 增加了 FRB 源具有多个形成通道的证据。因此，即使快速射电暴宿主通常是恒星形成的，但也必须存在与星系中古老恒星种群一致的形成通道。我们在此报告的两个 FRB 宿主的不同恒星形成历史表明 FRB 祖细胞具有广泛的延迟时间分布。未来使用我们在此开发的方法来约束 FRB 延迟时间分布的工作，对于确定 FRB 源的演化历史将至关重要。
The stellar population environments that are associated with fast radio burst (FRB) sources provide important insights for developing their progenitor theories. We expand the diversity of known FRB host environments by reporting two FRBs in massive galaxy clusters that were discovered by the Deep Synoptic Array (DSA-110) during its commissioning observations. FRB 20220914A has been localized to a star-forming, late-type galaxy at a redshift of 0.1139 with multiple starbursts at lookback times less than ∼3.5 Gyr in the A2310 galaxy cluster. Although the host galaxy of FRB 20220914A is similar to typical FRB hosts, the FRB 20220509G host stands out as a quiescent, early-type galaxy at a redshift of 0.0894 in the A2311 galaxy cluster. The discovery of FRBs in both late- and early-type galaxies adds to the body of evidence that the FRB sources have multiple formation channels. Therefore, even though FRB hosts are typically star-forming, there must exist formation channels that are consistent with old stellar population in galaxies. The varied star formation histories of the two FRB hosts that we report here indicate a wide delay-time distribution of FRB progenitors. Future work in constraining the FRB delay-time distribution, using the methods that we develop herein, will prove crucial in determining the evolutionary histories of FRB sources.