Interstellar Dust: Ultraviolet Extinction - a biased review

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

16. None

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
23. None

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

35. None

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