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, Regina A. Jorgenson, Cherie K. Day, Lachlan Marnoch, Shivani Bhandari, Adam T. Deller, Hao Qiu, Keith W. Bannister, Ryan M. Shannon, Kasper E. Heintz

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25 Scopus citations


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 (ΣSFR = 1.5 × 10-2 M⊙ yr-1 kpc-2) in the northwest spiral arm of HG 190608. Using Hβ emission present in our Keck Cosmic Web Imager integral field spectrum of the galaxy with a surface brightness of μHβ=(3.36 ± 0.21)× 10-17 erg s-1 cm-2 arcsec-2, we infer an extinction-corrected Hα 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 vcirc = 141 ± 8 km s-1 at an inclination igas = 37° ± 3°, giving a dynamical mass Mhalodyn ≈ 1011.96±0.08 M⊙. This implies a halo contribution to the DM of DMHost,Halo = 55 ± 25 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 Ωp = 34 ± 6 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 tenc = 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.

Original languageEnglish
Article number173
JournalAstrophysical Journal
Issue number2
StatePublished - 1 Dec 2021


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