Further studies of λ 5797.1 Diffuse Interstellar Band Takeshi Oka, Lew M. Hobbs, Daniel E. Welty, Donald G. York Department of Astronomy and Astrophysics,

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Presentation transcript:

Further studies of λ Diffuse Interstellar Band Takeshi Oka, Lew M. Hobbs, Daniel E. Welty, Donald G. York Department of Astronomy and Astrophysics, University of Chicago Julie Dahlstrom Department of Physics and Astronomy Carthage College Adolf N. Witt Department of Physics and Astronomy University of Toledo June 25, 2015, International Symposium on Molecular Spectroscopy, University of Illinois at Urbana Champaign

The Diffuse Interstellar Bands (DIBs) Ben McCall Don York Apache point observatory

414 bands 380 bands Two contrasting sightlines, C 2 C 3 rich and poor HD Highest N(C 2 ) and N(C 3 ) HD C 2, C 3 not detected

Our previous work on λ DIB x-axis Stars ~ 300 (SDSS > 5000) y-axis DIBs ~ 500 Herschel 36 λ 5797 DIB From Don York October 8, 2011 Her 38 rotational excitation high T r ~ 90 K B´ ‒ B < 0 linear molecule polar molecule n ≤ 7 Polar molecule Parallel band of prolate top T r = 2.73 K 5 ≤ n ≤ 7 AAT R ~ 600,000

Vibronic satellites of λ DIB HD DIBs HD DIBs Å cm -1

Correlations between DIBs × ×

0.943 (77) (77) (109) Vibronic bands 1147 cm cm Å cm Å cm Å cm cm cm -1

Correlations: vs 5494 and 5545 r = starsr = stars HD HD Hobbs et al. (2009)

Line shape ESO LaSilla 3.6-m telescope R = 115,000

II DIB and RR 5800 by the same molecule

Emission and Absorption Herschel 36 T r ~ 90 K Red Rectangle 3000 K

Draine, Ann. Rev. Astron. Astrophys. 41, 241 (2003) III Anomalous microwave emission

A&A 565, A103 (2014) ApJ 460, 1 (1996)

I am scared and mystified High column density cm -2 Snow & McCall, ARAA, 44, 367 (2004) PAH C 60