Multiwavelength (ISM) Dust Signatures

Talk for ISM*@ST research group.

Transcript

1. 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
2. Outline • Extinction – Features and Continuum – Polarization – Splitting into absorption & scattering • Emission – Non-thermal & Thermal • Biased, incomplete, ….
3. Dust in Extinction
4. X-Ray
5. See L. Corrales Talk
6. 2175 A FUV Rise 3.4 μm NIR Features? Sil 10 μm Sil 10 μm MIR Optical Features
7. Far-UV Rise
8. Fitzpatrick & Massa 1988, ApJ, 328, 734
9. Gordon, Cartledge, & Clayton 2009, ApJ, 705, 1320
10. 2175 A Extinction Bump
11. Stecher 1965, ApJ, 142, 1683
12. Stecher 1966, ApJ, 157, 125
13. 2175 A Properties Fitzpatrick & Massa (1986, ApJ, 307, 286)
14. Cardelli, Clayton, & Mathis 1988, ApJ, 329L, 33; 1989, ApJ, 345, 245
15. Broad Optical Extinction Bumps
16. 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
17. 3.4 micron HAC feature
18. 3.4 micron HAC Hydrogenated Amorphous Carbon (aliphatic bonds) Pendelton & Allamandola (2002, ApJS, 138, 75
19. 10 & 20 micron Silicate Features
20. Gordon et al. (2021, ApJ, 916, 33)
21. 10 & 20 micron Silicates Chiar & Tielens (2006, ApJ, 637, 774)
22. Crystalline Silicate Fraction ~0.2% (or zero) Kemper, Viernd, & Tielens (2004, ApJ, 609, 826) Amorphous Crystalline
23. Aromatic (PAH) features in Absorption
27. Ices
29. Diffuse Interstellar Bands (Dust?) Ran out of time to get slides
30. Continuum
32. DGFit
33. Extinction Polarization
39. Splitting Extinction
40. Reflection Nebulae IC 435 NGC 7023 BVR UIT 2500 A BVR The Pleiades
41. Dark Clouds Thumbprint (DSS) Bok Globule (DSS2) Witt et al. 1990
42. Diffuse Galactic Light NUVIEWS 1740 A; Schiminovich 2001 Pioneer 10/11 Blue Toller 1981; Gordon et al. 1997
43. Dust in Emission Non-thermal
44. Blue Luminescence
46. Extended Red Emission
47. Photoluminescence from HAC films Reflection Nebula NGC 7023
49. Dust in Emission Thermal Equilibrium and Non-equilibrium
50. Non-Equilibrium Continuum
52. Aromatic (PAH) Features
53. Aromatic (PAH) Features Werner, M. et al. 2004, ApJS, 154, 309
54. 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
55. 1st Proposal of Aromatics 1981
56. 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
57. 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)
58. Equilibrium Thermal
59. 2003, A&A, 407, 159
63. Other
64. 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
65. Thanks
66. Indirect Measures
67. Milky Way Depletions Jenkins (2009, ApJ, 700, 1299)