| Abstract |
We present JWST Mid-InfraRed Instrument/Medium-Resolution Spectrometer (MIRI/MRS) observations of an infrared luminous disk galaxy, FLS1, at z ∼ 0.54. With a lookback time of 5 Gyr, FLS1 is chronologically at the midpoint between the peak epoch of star formation and the present day. The MRS data provide maps of the atomic fine structure lines [Ar ii ]6.99, [Ar iii ]8.99, [Ne ii ]12.81, and [Ne iii ]15.55 μ m, polycyclic aromatic hydrocarbon (PAH) features at 3.3, 6.2, and 11.3 μ m, and the warm molecular gas indicators H 2 S(5) and H 2 S(3); all these emission features are spatially resolved. We find that the PAH emission is more extended along the northern side of the galaxy when compared to the well-studied star formation tracer [Ne ii ]. The H 2 rotational lines, which are shock indicators, are strongest and most extended on the southern side of the galaxy. [Ar ii ] is the second brightest fine structure line detected in FLS1 and we show that it is a useful kinematic probe that can be detected with JWST out to z ∼ 3. Velocity maps of [Ar ii ] show a rotating disk with signs of turbulence. Our results provide an example of how spatially resolved mid-infrared spectroscopy can allow us to better understand the star formation and interstellar medium conditions in a galaxy halfway back to the peak epoch of galaxy evolution. |
| Authors |
Jason Young  , Alexandra Pope , Anna Sajina , Lin Yan , T. S. Gonçalves , Miriam Eleazer , Stacey Alberts , L. Armus , M. Bonato , Daniel A. Dale  , D. Farrah , Carl Ferkinhoff , Christopher C. Hayward , Jed McKinney , E. J. Murphy , N. P. H. Nesvadba , Patrick Ogle , Leonid Sajkov , Sylvain Veilleux
|
| Journal Info |
IOP Publishing | The Astrophysical Journal Letters , vol: 958
, iss: 1
, pages: L5 - L5
|
| Publication Date |
11/1/2023 |
| ISSN |
2041-8205 |
Type |
article |
| Open Access |
gold
|
| DOI |
https://doi.org/10.3847/2041-8213/ad07e1 |
| Keywords |
Young Stellar Objects (Score: 0.477911)
|
