Armus, L. and Lai, T. and U, V. and Larson, K. L. and Diaz-Santos, T. and Evans, A. S. and Malkan, M. A. and Rich, J. and Medling, A. M. and Law, D. R. and Inami, H. and Muller-Sanchez, F. and Charmandaris, V. and Werf, P. van der and Stierwalt, S. and Linden, S. and Privon, G. C. and Barcos-Muñoz, L. and Hayward, C. and Song, Y. and Appleton, P. and Aalto, S. and Bohn, T. and Böker, T. and Brown, M. J. I. and Finnerty, L. and Howell, J. and Iwasawa, K. and Kemper, F. and Marshall, J. and Mazzarella, J. M. and McKinney, J. and Murphy, E. J. and Sanders, D. and Surace, J. (2023) GOALS-JWST: Mid-infrared Spectroscopy of the Nucleus of NGC 7469. The Astrophysical Journal Letters, 942 (2). L37. ISSN 2041-8205
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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 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 ∼500 to 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 1–2 orders of magnitude larger than the current black hole accretion rate needed to power the AGN. Eight pure rotational H2 emission lines are detected with intrinsic widths ranging from FWHM ∼125 to 330 km s−1. We estimate a total mass of warm H2 gas of ∼1.2 × 107 M⊙ in the central 100 pc. The PAH features are extremely weak in the nuclear spectrum, but a 6.2 μm PAH feature with an equivalent width of ∼0.07 μm and a flux of 2.7 × 10−17 W m−2 is detected. The spectrum is steeply rising in the mid-infrared, with a silicate strength of ∼0.02, significantly smaller than seen in most PG QSOs but comparable to other Seyfert 1s. These early MIRI mid-infrared IFU data highlight the power of JWST to probe the multiphase interstellar media surrounding actively accreting supermassive black holes.
Item Type: | Article |
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Subjects: | Asian STM > Physics and Astronomy |
Depositing User: | Managing Editor |
Date Deposited: | 20 Apr 2023 06:12 |
Last Modified: | 08 Feb 2024 04:14 |
URI: | http://journal.send2sub.com/id/eprint/1256 |