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Multiwavelength (ISM) Dust Signatures
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Karl Gordon
November 01, 2021
Research
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Multiwavelength (ISM) Dust Signatures
Talk for ISM*@ST research group.
Karl Gordon
November 01, 2021
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Transcript
Multi-Wavelength (ISM) Dust Signatures Karl D. Gordon Astronomer STScI, Baltimore,
MD ISM*@ST Group Meeting 25 Oct 2021 kgordon@stsci.edu @karllark2000 karllark@github
Outline • Extinction – Features and Continuum – Polarization –
Splitting into absorption & scattering • Emission – Non-thermal & Thermal • Biased, incomplete, ….
Dust in Extinction
X-Ray
See L. Corrales Talk
2175 A FUV Rise 3.4 μm NIR Features? Sil 10
μm Sil 10 μm MIR Optical Features
Far-UV Rise
Fitzpatrick & Massa 1988, ApJ, 328, 734
Gordon, Cartledge, & Clayton 2009, ApJ, 705, 1320
2175 A Extinction Bump
Stecher 1965, ApJ, 142, 1683
Stecher 1966, ApJ, 157, 125
2175 A Properties Fitzpatrick & Massa (1986, ApJ, 307, 286)
Cardelli, Clayton, & Mathis 1988, ApJ, 329L, 33; 1989, ApJ,
345, 245
Broad Optical Extinction Bumps
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
3.4 micron HAC feature
3.4 micron HAC Hydrogenated Amorphous Carbon (aliphatic bonds) Pendelton &
Allamandola (2002, ApJS, 138, 75
10 & 20 micron Silicate Features
Gordon et al. (2021, ApJ, 916, 33)
10 & 20 micron Silicates Chiar & Tielens (2006, ApJ,
637, 774)
Crystalline Silicate Fraction ~0.2% (or zero) Kemper, Viernd, & Tielens
(2004, ApJ, 609, 826) Amorphous Crystalline
Aromatic (PAH) features in Absorption
None
None
None
Ices
None
Diffuse Interstellar Bands (Dust?) Ran out of time to get
slides
Continuum
None
DGFit
Extinction Polarization
None
None
None
None
None
Splitting Extinction
Reflection Nebulae IC 435 NGC 7023 BVR UIT 2500 A
BVR The Pleiades
Dark Clouds Thumbprint (DSS) Bok Globule (DSS2) Witt et al.
1990
Diffuse Galactic Light NUVIEWS 1740 A; Schiminovich 2001 Pioneer 10/11
Blue Toller 1981; Gordon et al. 1997
Dust in Emission Non-thermal
Blue Luminescence
None
Extended Red Emission
Photoluminescence from HAC films Reflection Nebula NGC 7023
None
Dust in Emission Thermal Equilibrium and Non-equilibrium
Non-Equilibrium Continuum
None
Aromatic (PAH) Features
Aromatic (PAH) Features Werner, M. et al. 2004, ApJS, 154,
309
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
1st Proposal of Aromatics 1981
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
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)
Equilibrium Thermal
2003, A&A, 407, 159
None
None
None
Other
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
Thanks
Indirect Measures
Milky Way Depletions Jenkins (2009, ApJ, 700, 1299)