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Internal Extinction in SDSS Galaxies

Internal Extinction in SDSS Galaxies. Jungyeon Cho Collaborators: C. Park & Y. Choi. Internal Extinction in Spirals (effect of inclination). Sombrero. NGC5866. Internal Extinction (effect of inclination). U-K. b. a. 0.1. 1. b/a. K magnitude: --------------------> ~no change.

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Internal Extinction in SDSS Galaxies

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  1. Internal Extinction in SDSS Galaxies Jungyeon Cho Collaborators: C. Park & Y. Choi

  2. Internal Extinction in Spirals (effect of inclination)

  3. Sombrero

  4. NGC5866

  5. Internal Extinction (effect of inclination) U-K b a 0.1 1 b/a K magnitude: --------------------> ~no change U or R mag. : --------------------> get dimmer

  6. b a Tully et al 1998 (86 galaxies)

  7. Data used for current study: SDSS D1 Number of SDSS spiral galaxies in the data: ~ 14K Among them, ~8K have JHK mag. Choi, Park, & Vogeley 07

  8. -23 K -20 3 2 C (=r90/r50)

  9. R-K

  10. U-K

  11. Slope (R-K)

  12. R-K K C

  13. U-K K C

  14. U-K C-dependence R-K

  15. U-K K-dependence R-K

  16. Origin of C-dependence C (=r90/r50) is related to galaxy’s morphology Origin of K dependence If K=bright => star formation rate is high (?) => lots of dust

  17. U-R

  18. U-R K C

  19. U-R K C

  20. Conclusion • Internal extinction depends on both c and K • Internal extinction is maximum at c~0.25 • Internal extinction is maximum at K ~ -23 • It is uncertain for K < -23

  21. Tully et al 1998 K: ~2.2mm R: ~700nm I: ~ 900nm Mag. after Galactic & k-corrections What causes the scatter? * Note: Insignificant absorption at K-band

  22. Tully et al 1998 Mag. after Galactic, k-, & inclination correction

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