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PHANGS–JWST first results : measuring polycyclic aromatic hydrocarbon properties across the multiphase interstellar medium

Jérémy Chastenet (UGent) , Jessica Sutter, Karin Sandstrom, Francesco Belfiore, Oleg V. Egorov, Kirsten L. Larson, Adam K. Leroy, Daizhong Liu, Erik Rosolowsky, David A. Thilker, et al.
(2023) ASTROPHYSICAL JOURNAL LETTERS. 944(2).
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Abstract
Ratios of polycyclic aromatic hydrocarbon (PAH) vibrational bands are a promising tool for measuring the properties of the PAH population and their effect on star formation. The photometric bands of the MIRI and NIRCam instruments on JWST provide the opportunity to measure PAH emission features across entire galaxy disks at unprecedented resolution and sensitivity. Here we present the first results of this analysis in a sample of three nearby galaxies: NGC 628, NGC 1365, and NGC 7496. Based on the variations observed in the 3.3, 7.7, and 11.3 mu m features, we infer changes to the average PAH size and ionization state across the different galaxy environments. High values of F335M(PAH)/F1130W and low values of F1130W/F770W are measured in H ii regions in all three galaxies. This suggests that these regions are populated by hotter PAHs, and/or that the PAH ionization fraction is larger. We see additional evidence of heating and/or changes in PAH size in regions with higher molecular gas content as well as increased ionization in regions with higher H alpha intensity.
Keywords
Space and Planetary Science, Astronomy and Astrophysics, IR SPECTROSCOPIC DATABASE, INFRARED-EMISSION BANDS, STAR-FORMATION, NEARBY GALAXIES, UPDATED CONTENT, CHARGE-STATE, DUST, CONSTRAINTS, EXCITATION, RESOLUTION

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MLA
Chastenet, Jérémy, et al. “PHANGS–JWST First Results : Measuring Polycyclic Aromatic Hydrocarbon Properties across the Multiphase Interstellar Medium.” ASTROPHYSICAL JOURNAL LETTERS, vol. 944, no. 2, 2023, doi:10.3847/2041-8213/acac94.
APA
Chastenet, J., Sutter, J., Sandstrom, K., Belfiore, F., Egorov, O. V., Larson, K. L., … Whitcomb, C. M. (2023). PHANGS–JWST first results : measuring polycyclic aromatic hydrocarbon properties across the multiphase interstellar medium. ASTROPHYSICAL JOURNAL LETTERS, 944(2). https://doi.org/10.3847/2041-8213/acac94
Chicago author-date
Chastenet, Jérémy, Jessica Sutter, Karin Sandstrom, Francesco Belfiore, Oleg V. Egorov, Kirsten L. Larson, Adam K. Leroy, et al. 2023. “PHANGS–JWST First Results : Measuring Polycyclic Aromatic Hydrocarbon Properties across the Multiphase Interstellar Medium.” ASTROPHYSICAL JOURNAL LETTERS 944 (2). https://doi.org/10.3847/2041-8213/acac94.
Chicago author-date (all authors)
Chastenet, Jérémy, 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, F. Bigiel, Médéric Boquien, Mélanie Chevance, Daniel A. Dale, J. M. Diederik Kruijssen, Eric Emsellem, Kathryn Grasha, Brent Groves, Hamid Hassani, Annie Hughes, Kathryn Kreckel, Sharon Meidt van der Wel, Hsi-An Pan, Miguel Querejeta, Eva Schinnerer, and Cory M. Whitcomb. 2023. “PHANGS–JWST First Results : Measuring Polycyclic Aromatic Hydrocarbon Properties across the Multiphase Interstellar Medium.” ASTROPHYSICAL JOURNAL LETTERS 944 (2). doi:10.3847/2041-8213/acac94.
Vancouver
1.
Chastenet J, Sutter J, Sandstrom K, Belfiore F, Egorov OV, Larson KL, et al. PHANGS–JWST first results : measuring polycyclic aromatic hydrocarbon properties across the multiphase interstellar medium. ASTROPHYSICAL JOURNAL LETTERS. 2023;944(2).
IEEE
[1]
J. Chastenet et al., “PHANGS–JWST first results : measuring polycyclic aromatic hydrocarbon properties across the multiphase interstellar medium,” ASTROPHYSICAL JOURNAL LETTERS, vol. 944, no. 2, 2023.
@article{01H464AH0GHNK8PJKPBZVG2EH4,
  abstract     = {{Ratios of polycyclic aromatic hydrocarbon (PAH) vibrational bands are a promising tool for measuring the properties of the PAH population and their effect on star formation. The photometric bands of the MIRI and NIRCam instruments on JWST provide the opportunity to measure PAH emission features across entire galaxy disks at unprecedented resolution and sensitivity. Here we present the first results of this analysis in a sample of three nearby galaxies: NGC 628, NGC 1365, and NGC 7496. Based on the variations observed in the 3.3, 7.7, and 11.3 mu m features, we infer changes to the average PAH size and ionization state across the different galaxy environments. High values of F335M(PAH)/F1130W and low values of F1130W/F770W are measured in H ii regions in all three galaxies. This suggests that these regions are populated by hotter PAHs, and/or that the PAH ionization fraction is larger. We see additional evidence of heating and/or changes in PAH size in regions with higher molecular gas content as well as increased ionization in regions with higher H alpha intensity.}},
  articleno    = {{L12}},
  author       = {{Chastenet, Jérémy and Sutter, Jessica and Sandstrom, Karin and Belfiore, Francesco and Egorov, Oleg V. and Larson, Kirsten L. and Leroy, Adam K. and Liu, Daizhong and Rosolowsky, Erik and Thilker, David A. and Watkins, Elizabeth J. and Williams, Thomas G. and Barnes, Ashley. T. and Bigiel, F. and Boquien, Médéric and Chevance, Mélanie and Dale, Daniel A. and Kruijssen, J. M. Diederik and Emsellem, Eric and Grasha, Kathryn and Groves, Brent and Hassani, Hamid and Hughes, Annie and Kreckel, Kathryn and van der Wel, Sharon Meidt and Pan, Hsi-An and Querejeta, Miguel and Schinnerer, Eva and Whitcomb, Cory M.}},
  issn         = {{2041-8205}},
  journal      = {{ASTROPHYSICAL JOURNAL LETTERS}},
  keywords     = {{Space and Planetary Science,Astronomy and Astrophysics,IR SPECTROSCOPIC DATABASE,INFRARED-EMISSION BANDS,STAR-FORMATION,NEARBY GALAXIES,UPDATED CONTENT,CHARGE-STATE,DUST,CONSTRAINTS,EXCITATION,RESOLUTION}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{10}},
  title        = {{PHANGS–JWST first results : measuring polycyclic aromatic hydrocarbon properties across the multiphase interstellar medium}},
  url          = {{http://doi.org/10.3847/2041-8213/acac94}},
  volume       = {{944}},
  year         = {{2023}},
}
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