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Multiwavelength (ISM) Dust Signatures

Karl Gordon
November 01, 2021

Multiwavelength (ISM) Dust Signatures

Talk for ISM*@ST research group.

Karl Gordon

November 01, 2021
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  1. Multi-Wavelength (ISM) Dust Signatures Karl D. Gordon Astronomer STScI, Baltimore,

    MD ISM*@ST Group Meeting 25 Oct 2021 [email protected] @karllark2000 karllark@github
  2. Outline • Extinction – Features and Continuum – Polarization –

    Splitting into absorption & scattering • Emission – Non-thermal & Thermal • Biased, incomplete, ….
  3. 2175 A FUV Rise 3.4 μm NIR Features? Sil 10

    μm Sil 10 μm MIR Optical Features
  4. Optical Features (origin unknown) Massa, Fitzpatrick, Gordon, et al. 2020,

    ApJ, 891, 67 Centers: 4370, 4870, & 6300 A Widths: ~10% Two blue correlate w/ 2175 A
  5. Discovery 1973 Observations made with U. of MN/UCSD 60” on

    Mt. Lemon and KP 50” with cooled filter-wheel spectrometer (R = 67) 11.3 mm feature too broad to be a atomic emission line
  6. Aromatic versus Aliphatic Aromatics have benzene rings 3.3 mm feature

    Aliphatics do not have benzene rings 3.4 mm feature Furton, D. et al. 1999, 526, 752 Lab IRS6 (Gal. Center) Cyg OB2 No. 12
  7. Polycyclic Aromatic Hydrocarbons Hudgins, D. M. & Allamandola, L. J.

    Astrophysics of Dust, ASP Conference Series, Vol. 309, Eds. Adolf N. Witt, Geoffrey C. Clayton and Bruce T. Draine., 665 Lab. Data Orion (ISO)
  8. Dorschner et al. 1995, A&A, 300, 503 Gordon et al.

    2000, ApJ, 544, 859 Olivine Silicates Fe Feature @ ~1.5 micron? Emission spectrum from reflection nebula NGC 7023 NW filament