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
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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