Is C 7. Really a Diffuse Interstellar Band Carrier??? Ben McCall Julie Thorburn Lew Hobbs Don York Takeshi Oka
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1 Is C 7 - Really a Diffuse Interstellar Band Carrier??? Ben McCall Julie Thorburn Lew Hobbs Don York Takeshi Oka Department of Astronomy & Astrophysics University of Chicago Special Thanks to John Maier
2 Diffuse Interstellar Bands P. Jenniskens, F.-X. Desert Over 200 sharp and broad ( diffuse ) bands Seen in absorption against reddened stars Range from ~4430 Å to >8000 Å Associated with diffuse (n ~ 10 2 cm -3 ) clouds Not all correlated; roughly increase with E B-V Long-standing astrophysical mystery! (also CH + and H 3+ )
3 Diffuse Cloud Survey Visible spectroscopy of DIBs, atoms, diatomics Apache Point Observatory (APO) Ultraviolet spectra of H, H 2, C, C +, CO Far Ultraviolet Spectroscopic Explorer (FUSE) Hubble Space Telescope (HST) Infrared spectroscopy of H 3 + and CO United Kingdom Infrared Telescope (UKIRT) Phoenix (Kitt Peak Cerro Tololo) Subaru (Japan Large National Telescope) World s largest correlation analysis Large collaboration Chicago: York, Hobbs, Thorburn, Welty, Oka, McCall Colorado: Snow, Rachford Johns Hopkins: Friedman, Sonnentrucker Gemini: Geballe NOAO: Hinkle Subaru: Goto, Kobayashi, Terada, Usuda
4 Apache Point Observatory 3.5 meter telescope near Alamogordo, New Mexico Astrophysical Research Consortium Echelle Spectrometer: Blazeless spectrum from ,000 Å in single exposure High resolution (λ / λ ~ 37,500) High sensitivity (S/N~1000)
5 The C 7 - Hypothesis M. Tulej et al., Astrophys. J. 506, L69 (1998) Gas phase spectrum by Maier s group mass-selection of ion beam resonance-enhanced two-color photodetachment low resolution, limit of sensitivity seven vibronic bands of A X several (broad) bands of B X Wavelength (nm) Comparison with DIB catalog of Jenniskens five A X bands agree within 2 Å 0 astronomical lines marginal (except 0 0 ) promising, but not convincing experiment didn t yield constants difficult to determine temperature dependence
6 Our Initial Comparison B. J. McCall, D. G. York, & T. Oka, Astrophys. J. 531, 329 (2000) First four stars from survey Cyg OB2 12, HD , HD 46711, HD Confirmed features near 4 A X bands λ6270, λ6065, λ5610, λ match probably not a DIB 2 0 Reasonable intensity correlation (4 bands) 1 0 Wavelength shift for band (2 Å) Need better laboratory data rotational, spin-orbit constants Need better observations larger sample of stars higher S/N
7 New Lab Results N. M. Lakin, M. Pachkov, M. Tulej, J. P. Maier, G. Chambaud, & P. Rosmus, JCP 113, 9586 (2000) Constant Theory Fit B'' (MHz) 897 (fixed) B' (MHz) 887 (fixed) A'' (cm -1 ) A' (cm -1 ) A X case (b) case (a)
8 0 0 0 (Ω''=1/2) & λ6270 HD HD K K 80 K Interstellar K atom velocity distribution FWHM = 10 km/s Relative Intensity K 60 K 50 K 40 K 30 K Wavelength discrepancy Profile mismatch (λ6270 too wide) 20 K 10 K Wavelength (Å)
9 0 0 0 (Ω''=3/2) 1.2 Ω''=1/2 Ω''=3/2 90 K 60 K ad hoc FWHM (30 km/s) K Relative Intensity 1.0 HD HD λ λ Wavelength (Å) No sign of Ω''=3/2 component!
10 The 1 0 Band & λ5610 λ HD HD K Relative Intensity K Wavelength (Å) Serious wavelength discrepancy Profile mismatch (λ5610 too wide)
11 Wavelength (Å) The Band & λ HD HD HD 2905 Jenniskens claimed certain DIB λ5748 Relative Intensity HD HD HD HD HD If spectra aligned by λ5748, stellar lines at 5740 Å all line up, and real DIB λ ( 0 0 ) no longer lines up! Appears in unreddened stars where DIB λ6270 absent HD λ5748 is a stellar line, not a DIB! 1.0 Cannot be a match for C
12 The Band & λ HD HD K Relative Intensity K 50 K 30 K K Wavelength (Å) 6075 Wavelength discrepancy 0 Much narrower than λ6270 ( ) 0 0
13 Wavelength (Å) The Band & λ HD HD HD HD HD No new lab work Relative Intensity Cyg OB2 5 HD HD HD DIB at 4964, old lab measurement was 4963 Absolutely NO correlation with λ6270 ( origin band )! HD HD HD
![Conclusions 0 0 0 1 0 1 2 0 1 3 0 2 1 13 0 0 [λ6270] wavelength discrepancy (~0.](/docs-images/95/123322330/images/14-0.jpg "5 Å) profile inconsistent (too wide) Ω''=3/2 component not detected [λ5610] wavelength discrepancy (~2 Å) profile inconsistent (too wide) [λ5748] not a DIB [λ6065] wavelength discrepancy (~1 Å) much")
14 Conclusions [λ6270] wavelength discrepancy (~0.5 Å) profile inconsistent (too wide) Ω''=3/2 component not detected [λ5610] wavelength discrepancy (~2 Å) profile inconsistent (too wide) [λ5748] not a DIB [λ6065] wavelength discrepancy (~1 Å) much narrower than λ6270 seems to correlate with λ6270 [λ4964] not correlated with λ6270! C 7 - is NOT really a DIB carrier!
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