arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.03257astro-ph.HEastro-ph.GAastro-ph.SR
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FRB 20180916 B的60 pc环境

The 60 pc Environment of FRB 20180916B

Shriharsh P. Tendulkar, Armando Gil de Paz, Aida Yu. Kirichenko, Jason W. T. Hessels, Mohit Bhardwaj, Fernando Ávila, Cees Bassa, Pragya Chawla, Emmanuel Fonsec… 展开作者

Shriharsh P. Tendulkar, Armando Gil de Paz, Aida Yu. Kirichenko, Jason W. T. Hessels, Mohit Bhardwaj, Fernando Ávila, Cees Bassa, Pragya Chawla, Emmanuel Fonseca, Victoria M. Kaspi, Aard Keimpema, Franz Kirsten, T. Joseph W. Lazio, Benito Marcote, Kiyoshi Masui, Kenzie Nimmo, Zsolt Paragi, Mubdi Rahman, Daniel Reverte Payá, Paul Scholz, Ingrid Stairs

摘要:

快速射电暴FRB 20180916 B位于其宿主星系SDSS J015800.28+654253.0中,149 Mpc,是迄今为止已知的最接近的FRB,具有强大的宿主星系协会。该源的爆发周期也为16.35天。在这里,我们提出了FRB 20180916 B的光学和红外成像以及积分场光谱观测与哈勃太空望远镜上的WFC 3相机和10.4米大加那利望远镜上的MEGARA摄谱仪。哈勃成像的60-90毫角秒(mas)分辨率,以及之前FRB 20180916 B的2.3-mas定位,使我们能够以30-60 pc的分辨率探测其环境。我们将FRB 20180916 B位置的任何点状恒星形成或HII区域限制为具有H $α$光度$L_\mathrm{Hα} \lesssim 10^{37}\,\mathrm{erg\,s^{-1}}$,相应地,将局部恒星形成速率限制为$\lesssim10^{-4}\,\mathrm{M_\odot\,yr^{-1}}$。对H $α$的约束表明,FRB 20180916 B的可能伴星应该是比O 6 V更冷、质量更小的光谱类型。FRB 20180916 B距离最近的年轻恒星团最亮的像素250 pc(投影距离),该像素是$\sim380$ \,pc大小(半峰全宽)。以双星中的双星、磁星或中子星的典型投影速度(60-750 km/s $^{-1}$),FRB 20180916 B将需要800 kyr到7 Myr才能从其假定的诞生地穿越观测距离。这个时间尺度与磁星的活跃年龄($\lesssim10$ kyr)不一致。相反,推断的年龄和观测到的分离与高质量X射线双星和伽马射线双星的年龄以及它们与最近的OB协会的分离是相容的。

英文摘要:

Fast Radio Burst FRB 20180916B in its host galaxy SDSS J015800.28+654253.0 at 149 Mpc is by far the closest-known FRB with a robust host galaxy association. The source also exhibits a 16.35-day period in its bursting. Here we present optical and infrared imaging as well as integral field spectroscopy observations of FRB 20180916B with the WFC3 camera on the Hubble Space Telescope and the MEGARA spectrograph on the 10.4-m Gran Telescopio Canarias. The 60-90 milliarcsecond (mas) resolution of the Hubble imaging, along with the previous 2.3-mas localization of FRB 20180916B, allow us to probe its environment with a 30-60 pc resolution. We constrain any point-like star-formation or HII region at the location of FRB 20180916B to have an H$α$ luminosity $L_\mathrm{Hα} \lesssim 10^{37}\,\mathrm{erg\,s^{-1}}$ and, correspondingly, constrain the local star-formation rate to be $\lesssim10^{-4}\,\mathrm{M_\odot\,yr^{-1}}$. The constraint on H$α$ suggests that possible stellar companions to FRB 20180916B should be of a cooler, less massive spectral type than O6V. FRB 20180916B is 250 pc away (in projected distance) from the brightest pixel of the nearest young stellar clump, which is $\sim380$\,pc in size (full-width at half maximum). With the typical projected velocities of pulsars, magnetars, or neutron stars in binaries (60-750 km s$^{-1}$), FRB 20180916B would need 800 kyr to 7 Myr to traverse the observed distance from its presumed birth site. This timescale is inconsistent with the active ages of magnetars ($\lesssim10$ kyr). Rather, the inferred age and observed separation are compatible with the ages of high-mass X-ray binaries and gamma-ray binaries, and their separations from the nearest OB associations.

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