A High-resolution View of Fast Radio Burst Host Environments
A High-resolution View of Fast Radio Burst Host Environments
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DOI：
10.3847/1538-4357/abff56
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发表时间：
2020-12
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通讯作者：
Alexandra G. Mannings;W. Fong;S. Simha;J. Prochaska;M. Rafelski;C. Kilpatrick;N. Tejos;K. Heintz;K. Bannister;S. Bhandari;C. Day;A. Deller;S. Ryder;R. Shannon;S. Tendulkar
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作者：
Alexandra G. Mannings;W. Fong;S. Simha;J. Prochaska;M. Rafelski;C. Kilpatrick;N. Tejos;K. Heintz;K. Bannister;S. Bhandari;C. Day;A. Deller;S. Ryder;R. Shannon;S. Tendulkar
我们展示了哈勃太空望远镜对8个亚弧秒定位的快速射电暴（FRB）宿主星系的紫外和红外观测，其中包括三个已知重复FRB的宿主星系。我们量化了它们相对于宿主星系光分布的空间分布和位置，发现它们出现在1.4r e （[0.6, 2.1]r e； 68%间隔）的中等宿主归一化偏移和宿主较暗的区域（就红外光而言），但总体上追踪了它们星系中红外光的径向分布。在我们测试的分布中，快速射电暴不能清楚地追踪任何其他具有已知祖先的瞬变种群的分布，并且在统计上与lgrb、缺h SLSNe、sgrb和富ca瞬变的位置不同。我们进一步发现，与它们的宿主的全球平均值相比，大多数快速射电暴并不在局部恒星形成率和恒星质量表面密度较高的区域。我们还设定了快速射电暴位置的红外通量上限，即m IR≥24.8-27.6 AB等，将卫星星系和背景星系的光度限制在远低于FRB 121102的宿主光度。我们发现，5/8的快速射电暴宿主在红外光下表现出明显的旋臂特征，并且这些宿主中所有定位良好的快速射电暴的位置都与它们的旋臂一致，尽管不是在它们最亮的区域。我们的结果并不强烈支持快速射电暴的主祖通道与质量最大的（剥离包层）恒星或需要踢动和长延迟时间的事件（中子星合并）有关。
We present Hubble Space Telescope ultraviolet and infrared observations of eight fast radio burst (FRB) host galaxies with subarcsecond localizations, including the hosts of three known repeating FRBs. We quantify their spatial distributions and locations with respect to their host galaxy light distributions, finding that they occur at moderate host-normalized offsets of 1.4r e ([0.6, 2.1]r e ; 68% interval) and on fainter regions of their hosts in terms of IR light but overall trace the radial distribution of IR light in their galaxies. The FRBs in our tested distribution do not clearly trace the distributions of any other transient population with known progenitors and are statistically distinct from the locations of LGRBs, H-poor SLSNe, SGRBs, and Ca-rich transients. We further find that most FRBs are not in regions of elevated local star formation rates and stellar mass surface densities in comparison to the mean global values of their hosts. We also place upper limits on the IR flux at the FRB positions of m IR ≳ 24.8–27.6 AB mag, constraining both satellite and background galaxies to luminosities well below the host luminosity of FRB 121102. We find that 5/8 FRB hosts exhibit clear spiral arm features in IR light, and that the positions of all well-localized FRBs located in such hosts are consistent with their spiral arms, although not on their brightest regions. Our results do not strongly support the primary progenitor channel of FRBs being connected with either the most massive (stripped-envelope) stars or events that require kicks and long delay times (neutron star mergers).