GOALS-JWST: Mid-Infrared Spectroscopy of the Nucleus of NGC 7469

Abstract

We present mid-infrared spectroscopic observations of the nucleus of the nearby Seyfert galaxy NGC 7469 taken with the MIRI instrument on the James Webb Space Telescope (JWST) as part of Directors Discretionary Time Early Release Science (ERS) program 1328. The high resolution nuclear spectrum contains 19 emission lines covering a wide range of ionization. The high ionization lines show broad, blueshifted emission reaching velocities up to 1700 km s${}^{-1}$ and FWHM ranging from $\sim 500-1100$ km s${}^{-1}$. The width of the broad emission and the broad to narrow line flux ratios correlate with ionization potential. The results suggest a decelerating, stratified, AGN driven outflow emerging from the nucleus. The estimated mass outflow rate is one to two orders of magnitude larger than the current black hole accretion rate needed to power the AGN. Eight pure rotational H${}_2$ emission lines are detected with intrinsic widths ranging from FWHM $\sim 125-330$ km s${}^{-1}$. We estimate a total mass of warm H${}_2$ gas of $\sim 1.2\times 10^7$M${}_{\odot }$ in the central 100 pc. The PAH features are extremely weak in the nuclear spectrum, but a $6.2\mu$m PAH feature with an equivalent width $\sim 0.07\mu$m and a flux of $2.7\times 10^{-17}$ W m${}^{-2}$ is detected. The spectrum is steeply rising in the mid-infrared, with a silicate strength $\sim 0.02$, significantly smaller than seen in most PG QSOs, but comparable to other Seyfert 1's. These early MIRI mid-infrared IFU data highlight the power of JWST to probe the multi-phase interstellar media surrounding actively accreting supermassive black holes.

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