Interstellar Dust: Ultraviolet Extinction - a biased review

95bba3a98c20be969c4fb42ea31ae4ae?s=47 Karl Gordon
August 05, 2019

Interstellar Dust: Ultraviolet Extinction - a biased review

A biased review of UV dust extinction curves for GeoffFest

95bba3a98c20be969c4fb42ea31ae4ae?s=128

Karl Gordon

August 05, 2019
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  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