Cited by 2,122Astrophysics and Star Formation StudiesGalaxies: Formation, Evolution, PhenomenaAstro and Planetary Science

Infrared Emission from Interstellar Dust. IV. The Silicate‐Graphite‐PAH Model in the Post‐ Spitzer Era

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Draine, B. T., Li, Aigen·2007·The Astrophysical Journal

Abstract

IR emission spectra are calculated for dust heated by starlight, for mixtures of amorphous silicate and graphitic grains, including varying amounts of PAH particles. The models are constrained to reproduce the average Milky Way extinction curve. The calculations include the effects of single-photon heating. Updated IR absorption properties for the PAHs are presented that are consistent with observed emission spectra, including those newly obtained by Spitzer . We find a size distribution for the PAHs giving emission band ratios consistent with the observed spectra of the Milky Way and other galaxies. Emission spectra are presented for a wide range of starlight intensities. We calculate how the efficiency of emission into different IR bands depends on PAH size; the strong 7.7 μm emission feature is produced mainly by PAH particles containing <10 3 C atoms. We also calculate how the emission spectrum depends on U , the starlight intensity relative to the local interstellar radiation field. The submillimeter and far-infrared emission is compared to the observed emission from the local interstellar medium. Using a simple distribution function, we calculate the emission spectrum for dust heated by a distribution of starlight intensities, such as occurs within galaxies. The models are parameterized by the PAH mass fraction q PAH , the lower cutoff U min of the starlight intensity distribution, and the fraction γ of the dust heated by starlight with U > U min . We present graphical procedures using Spitzer IRAC and MIPS photometry to estimate the parameters q PAH , U min , and γ, the fraction f PDR of the dust luminosity coming from photodissociation regions with U > 100, and the total dust mass M dust .

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Crossref · 10.1086/511055

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  • Depending on shock velocity, a photon precursor can sufficiently heat dust to emit in the 12 μm band while dust inside the shock is heated by collisional processes and emits in both 12 and 22 μm bands.

    “Depending on the shock velocity, such a photon precursor can sufficiently heat the dust to emit in the 12 µ m band (Draine &amp; Li 2007; Draine 2011) while the dust inside the shock is heated by collisional processes, and therefore, emits in both 12 µ m and 22 µ m bands (Ponti et al. 2021).”

    From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Draine & Li 2007

    Section 10.2 (page unavailable) says photons can excite PAHs enough to emit mid-infrared bands and identifies PAH features as the dominant contributor to IRAS 12 μm emission. It does not address photon precursors or how shock velocity affects that heating. The collisional-heating clause is attributed to a different citation and is not assessed here. (LLM, conf=0.88)

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Research works printed but not linked: 6

  1. Draine, B. T. 1994, in ASP Conf. Ser. 58, The First Symposium on the Infrared Cirrus and Diffuse Interstellar Clouds, ed. R. M. Cutri & W. B. Latter (San Francisco: ASP), 227
  2. ---. 2006, in ASP Conf. Ser. 348, Astrophysics in the Far Ultraviolet, ed.
  3. ---. 2005, in IAU Symp. 231, Astrochemistry, ed. D. C. Lis, G. A. Blake, & E. Herbst (Cambridge: Cambridge Univ. Press), 443
  4. Kawada, M., Shibai, H., Kaneda, H., & Nakagawa, T. 2004, Proc. SPIE, 5487, 359
  5. Mason, R. E., Wright, G. S., Adamson, A., & Pendleton, Y. 2007, ApJ, in press
  6. Onaka, T., et al. 2004, Proc. SPIE, 5487, 338

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Authors
Draine, B. T., & Li, A.
Affiliations
  • Princeton University (US)
  • University of Missouri (US)
Venue
The Astrophysical Journal
Published
2007-03-10
Volume
657
Issue
2
Pages
810-837
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
OpenAlex
W2048274049
Cited by
2,122
References
123
Citations by year
2026: 79 · 2025: 124 · 2024: 149 · 2023: 124 · 2022: 111 · 2021: 128 · 2020: 115 · 2019: 133 · 2018: 127 · 2017: 124 · 2016: 137 · 2015: 117 · 2014: 114 · 2013: 110 · 2012: 99
FWCI
46.24
Type
journal article
Language
en
Open access
Locations
  • The Astrophysical Journal (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • CERN Document Server (European Organization for Nuclear Research) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • National Science Foundation (0406883)
  • National Aeronautics and Space Administration
  • University of Missouri
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
Keywords
interstellar dust, infrared emission spectra, polycyclic aromatic hydrocarbons, graphite grains, dust size distribution, photodissociation regions, dust mass estimation

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