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PHANGS-JWST First Results: Variations in PAH Fraction as a Function of ISM Phase and Metallicity | | Jérémy Chastenet
; Jessica Sutter
; Karin Sandstrom
; Francesco Belfiore
; Oleg V. Egorov
; Kirsten L. Larson
; Adam K. Leroy
; Daizhong Liu
; Erik Rosolowsky
; David A. Thilker
; Elizabeth J. Watkins
; Thomas G. Williams
; Ashley T. Barnes
; Frank Bigiel
; Médéric Boquien
; Mélanie Chevance
; I-Da Chiang
; Daniel A. Dale
; J. M. Diederik Kruijssen
; Eric Emsellem
; Kathryn Grasha
; Brent Groves
; Hamid Hassani
; Annie Hughes
; Kathryn Kreckel
; Sharon E. Meidt
; Ryan J. Rickards Vaught
; Amy Sardone
; Eva Schinnerer
; | | Date: |
2 Jan 2023 | | Abstract: | We present maps tracing the fraction of dust in the form of polycyclic
aromatic hydrocarbons (PAHs) in IC 5332, NGC 628, NGC 1365, and NGC 7496 from
JWST/MIRI observations. We trace the PAH fraction by combining the F770W
($7.7~mu$m) and F1130W ($11.3~mu$m) filters to track ionized and neutral PAH
emission, respectively, and comparing the PAH emission to F2100W which traces
small, hot dust grains. We find average $R{
m_{PAH} = (F770W+F1130W)/F2100W}$
values of 3.3, 4.7, 5.1, and 3.6 in IC 5332, NGC 628, NGC 1365, and NGC 7496,
respectively. We find that H II regions traced by MUSE H$alpha$ show a
systematically low PAH fraction. The PAH fraction remains relatively constant
across other galactic environments, with slight variations. We use CO + H I +
H$alpha$ to trace the interstellar gas phase and find that the PAH fraction
decreases above a value of I$_{Halpha}/Sigma_{H~I+H_2}$ $sim~10^{37.5}$ erg
s$^{-1}$ kpc$^{-2}$ (M$_odot$ pc$^{-2}$)$^{-1}$, in all four galaxies. Radial
profiles also show a decreasing PAH fraction with increasing radius, correlated
with lower metallicity, in line with previous results showing a strong
metallicity dependence to the PAH fraction. Our results suggest that the
process of PAH destruction in ionized gas operates similarly across the four
targets. | | Source: | arXiv, 2301.00578 | | Services: | Forum | Review | PDF | Favorites | |
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