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arXiv 2005.13158astro-ph.GA
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FRB 190608在其宿主星系旋臂中的局域环境剖析

Dissecting the Local Environment of FRB 190608 in the Spiral Arm of its Host Galaxy

Jay S. Chittidi, Sunil Simha, Alexandra Mannings, J. Xavier Prochaska, Stuart D. Ryder, Marc Rafelski, Marcel Neeleman, Jean-Pierre Macquart, Nicolas Tejos, Reg… 展开作者

Jay S. Chittidi, Sunil Simha, Alexandra Mannings, J. Xavier Prochaska, Stuart D. Ryder, Marc Rafelski, Marcel Neeleman, Jean-Pierre Macquart, Nicolas Tejos, Regina A. Jorgenson, Cherie K. Day, Lachlan Marnoch, Shivani Bhandari, Adam T. Deller, Hao Qiu, Keith W. Bannister, Ryan M. Shannon, Kasper E. Heintz

摘要:

本文对$z=0.11778$的SB(r)c星系(以下简称HG 190608)--快射电暴(FRB)190608的宿主星系进行了高分辨率分析,以剖析其局部环境及其对FRB性质的贡献。我们的哈勃空间望远镜宽视场相机3紫外和可见光图像显示,FRB~190608的亚角秒定位与HG~190608西北旋臂中的恒星形成结($Σ_{\rm SFR} = 1.5 \times 10^{-2}~ M_{\odot} \, \rm \, yr^{-1} \, kpc^{-2}$)相一致。利用我们的Keck宇宙网络成像仪积分场光谱中的H $β$发射,我们推断了一个修正的H $α$表面亮度,并计算了$\rm DM_{\rm Host,ISM} = 94 \pm 38~ \;pc\;cm^{-3}$的HG 190608星际介质的色散测度(DM)。该星系以圆周速度$v_{\rm circ} = \rm 141 \pm 8~ km\;s^{-1}$旋转,倾角为$i_{\mathrm{gas}} = 37 \pm 3^\circ$,动力学质量为$M_{\rm halo}^{\rm dyn} \approx 10^{11.96 \pm 0.08}~M_{\odot}$。这意味着一个晕贡献DM的$\rm DM_{\rm Host,Halo}= \rm 55\pm25 \;pc\;cm^{-3}$受假设的密度分布和分数的重子保留。从星系的自转曲线,我们推断了一个酒吧诱导的图案速度$Ω_p=34\pm 6\;\mathrm{km\;s^{-1}\;kpc^{-1}}$使用线性共振理论。然后,我们计算最大的时间,因为恒星形成的祖先使用最远的距离,以手臂的前缘内的定位,并找到$t_{\mathrm{enc}} = 21_{-6}^{+25}$ MYR。与以前的高分辨率研究FRB环境,我们没有发现任何证据的干扰形态,排放量,或运动FRB 190608。

英文摘要:

We present a high-resolution analysis of the host galaxy of fast radio burst (FRB)~190608, an SB(r)c galaxy at $z=0.11778$ (hereafter HG 190608), to dissect its local environment and its contributions to the FRB properties. Our Hubble Space Telescope Wide Field Camera 3 ultraviolet and visible light image reveals that the subarcsecond localization of FRB~190608 is coincident with a knot of star-formation ($Σ_{\rm SFR} = 1.5 \times 10^{-2}~ M_{\odot} \, \rm \, yr^{-1} \, kpc^{-2}$) in the northwest spiral arm of HG~190608. Using H$β$ emission present in our Keck Cosmic Web Imager integral field spectrum of the galaxy with a surface brightness of $μ_{\rm Hβ}= \mathrm{(3.36\pm0.21)\times10^{-17}\;erg\;s^{-1}\;cm^{-2}\;arcsec^{-2}}$, we infer an extinction-corrected H$α$ surface brightness and compute a dispersion measure (DM) from the interstellar medium of HG 190608 of $\rm DM_{\rm Host,ISM} = 94 \pm 38~ \;pc\;cm^{-3}$. The galaxy rotates with a circular velocity $v_{\rm circ} = \rm 141 \pm 8~ km\;s^{-1}$ at an inclination $i_{\mathrm{gas}} = 37 \pm 3^\circ$, giving a dynamical mass $M_{\rm halo}^{\rm dyn} \approx 10^{11.96 \pm 0.08}~M_{\odot}$. This implies a halo contribution to the DM of $\rm DM_{\rm Host,Halo}= \rm 55\pm25 \;pc\;cm^{-3}$ subject to assumptions on the density profile and fraction of baryons retained. From the galaxy rotation curve, we infer a bar-induced pattern speed of $Ω_p=34\pm 6\;\mathrm{km\;s^{-1}\;kpc^{-1}}$ using linear resonance theory. We then calculate the maximum time since star-formation for a progenitor using the furthest distance to the arm's leading edge within the localization, and find $t_{\mathrm{enc}} = 21_{-6}^{+25}$ Myr. Unlike previous high-resolution studies of FRB environments, we find no evidence of disturbed morphology, emission, or kinematics for FRB 190608.

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