Interstellar Dust: Ultraviolet Extinction - a biased review

A biased review of UV dust extinction curves for GeoffFest

Transcript

1. Interstellar Dust: Ultraviolet Extinction (a biased review) Karl D. Gordon GeoffFest Boulder, CO 5 Aug 2019 ISM@ST member kgordon@stsci.edu @karllark2000 karllark@github “Have Dust – Will Study” Slides on SpeakerDeck
2. Plan • Intro • Milky Way UV extinction • Local Group UV extinction – LMC, SMC, M31, & M33 • Misc • Final Throughts
3. Why Extinction? • Pillar in constraining dust grain properties Weingartner & Draine (2003)
4. Why Extinction? Jones et al. (2013)
5. Extinction (not Attenuation) • Extinction – Absorption and scattering out of the line-of-sight – Specific to a point source behind a screen of dust • (dust not too near the point source) – Extinction proportional to dust grain properties • Attenuation includes information not present in extinction – scattering into the line-of-sight – Star/dust geometry – Applies to galaxies, regions of galaxies, stars with circumstellar dust
6. Extinction vs Attenuation Github: karllark/dust_attenuation Github: karllark/dust_extinction
7. Pair Method Github: karllark/measure_extinction
8. Ultraviolet Extinction Milky Way
9. Stecher 1965, ApJ, 142, 1683
10. Stecher 1966, ApJ, 157, 125
11. Bless & Savage, 1970, IAUS, 36, 28
12. Nandy et al. 1976, A&A, 51, 63 No Regional Variations
13. Koornneff 1978, A&A, 68, 139 Regional Variations (same data as Nandy et al. 1976)
14. Seaton 1979, MNRAS, 187, 73
15. Savage & Mathis 1979, ARA&A, 17, 73
17. Witt, Bohlin, & Stecher 1984, 279, 698
18. Clayton & Fitzpatrick 1987, AJ, 93, 157
19. Cardelli & Clayton 1988, AJ, 95, 516
20. Fitzpatrick & Massa 1986, ApJ, 307, 286
21. Fitzpatrick & Massa 1988, ApJ, 328, 734
22. Cardelli, Clayton, & Mathis 1988, ApJ, 329L, 33; 1989, ApJ, 345, 245
24. Mathis & Cardelli 1991, ApJ, 398, 610 Cardelli & Clayton, 1991, AJ, 101, 1021
25. More CCM89 deviants Many are not CCM89 deviant Clayton & Hanson 1993, AJ, 105, 1880 Hanson & Clayton 1993, AJ, 106, 1947
26. Valencic, Clayton, & Gordon 2004, ApJ, 616, 912
27. Clayton et al. 2003, ApJ, 592, 947
28. Whittet et al. 2004, ApJ, 602, 291
29. Far-Ultraviolet Extinction Milky Way
30. Buss et al. 1994, ApJ, 430, 630
31. Lewis, Cook, & Chakrabarti 2005, ApJ, 619, 357
32. Sofia et al. 2005, ApJ, 625, 167
33. Gordon, Cartledge, & Clayton 2009, ApJ, 705, 1320
34. Ultraviolet Extinction Large Magellanic Cloud
36. Clayton & Martin 1985, ApJ, 288, 558
37. Misselt, Clayton, & Gordon 1999, ApJ, 515, 128
38. Ultraviolet Extinction Small Magellanic Cloud
39. Prevot et al. 1984, A&A, 132, 389
40. Gordon & Clayton 1998, ApJ, 500, 816
41. Gordon et al. 2020, in prep.
42. Ultraviolet Extinction MW, LMC, SMC
43. Gordon & Clayton 2003, ApJ, 594, 279`
44. Clayton, Gordon, & Wolff 2000, ApJS, 129, 147
45. Valencic et al. 2003, ApJ, 598, 369
46. Clayton et al. 2003, ApJ, 588, 871
47. Ultraviolet Extinction M31/M33
48. Bianchi et al. 1996, ApJ, 471, 203
49. Clayton et al. 2015, ApJ, 815, 14
50. Clayton, Gordon, et al. al 2020, in prep
51. Clayton, Gordon, et al. al 2020, in prep
52. Ultraviolet Extinction Implications
53. Pitman, Clayton, & Gordon 2000, PASP, 112, 537
54. McGough et al. 2005, ApJ, 624, 118
55. Final Thoughts • Geoff has a bunch of UV extinction papers • UV extinction story still being written • “True” R(V) dependent relationship – Sample selection critical • Local Group → just getting started – Need larger samples • Expanding beyond the UV – Optical: Derck’s talk – MIR: Spitzer (ongoing), NIR IRTF/SpeX (planned)
56. Github: karllark/dust_extinction
57. Final Thoughts • Geoff has a bunch of UV extinction papers • UV extinction story still being written • “True” R(V) dependent relationship – Sample selection critical • Local Group → just getting started – Need larger samples • Expanding beyond the UV – Optical: Derck’s talk – MIR: Spitzer (ongoing), NIR IRTF/SpeX (planned)
58. Thanks
59. Thanks