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

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 (Sigma(SFR) = 1.5 x 10(-2) M (circle dot) yr(-1) kpc(-2)) in the northwest spiral arm of HG 190608. Using H beta emission present in our Keck Cosmic Web Imager integral field spectrum of the galaxy with a surface brightness of mu H-beta=(3.36 +/- 0.21) x 10(-17) ergs(-1) cm(-2) arcsec(-2), we infer an extinction-corrected H alpha surface brightness and compute a dispersion measure (DM) from the interstellar medium of HG 190608 of DMHost,ISM = 94 +/- 38 pc cm(-3). The galaxy rotates with a circular velocity v (circ) = 141 +/- 8 km s(-1) at an inclination i(gas) = 37 degrees +/- 3 degrees, giving a dynamical mass Mhalodyn approximate to 1011.96 +/- 0.08M circle dot 更多