Kavli Affiliate: Claudio Ricci
| First 5 Authors: Grant P. Donnelly, Thomas S. -Y. Lai, Lee Armus, Tanio Díaz-Santos, Kirsten L. Larson
| Summary:
We introduce a prescription for estimating the flux of the 7.7 micron and
11.3 micron polycyclic aromatic hydrocarbon (PAH) features from broadband
JWST/MIRI images. Probing PAH flux with MIRI imaging data has advantages in
field of view, spatial resolution, and sensitivity compared with MIRI spectral
maps, but comparisons with spectra are needed to calibrate these flux
estimations over a wide variety of environments. For 267 MIRI/MRS spectra from
independent regions in the four luminous infrared galaxies (LIRGs) in the Great
Observatories All-sky LIRG Survey (GOALS) early release science program, we
derive synthetic filter photometry and directly compare estimated PAH fluxes to
those measured from detailed spectral fits. We find that for probing PAH 7.7
micron, the best combination of filters is F560W, F770W, and either F1500W or
F2100W, and the best for PAH 11.3 micron is F560W, F1000W, F1130W, and F1500W.
The prescription with these combinations yields predicted flux densities that
typically agree with values from spectral decomposition within ~7% and ~5% for
PAH 7.7 and 11.3 micron, respectively.
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