A Comparison of Laboratory and ALMA Spectra

The hot core of Orion KL (R. A. = 05hr 35m 14.35s, Dec = -05o 22’ 35” (J2000)) [1]. Preliminary data for a single pixel (of a 1024 x 1024 array of pixels) centered on the hot core of Orion KL is used in this comparison.

Here we will consider how well simple models based on CES can simulate this ALMA spectrum for a number of the astrophysical ‘weed’ molecules [6]. Issues that are addressed include the completeness of the laboratory spectroscopic basis in the context of this real astrophysical example and how well the simplest LTE models of the interstellar medium can account for the astrophysical spectrum.

References

  1. Friedel, D. N. & Snyder, L. E. High-Resolution 1 mm CARMA Observations of Large Molecules in Orion-KL Astrophys. J. 672, 962-973 (2008). Google Scholar
  2. Genzel, R. & Stutzki, J. The Orion Molecular Cloud and star-forming region Annu. Rev. Astron. Astrophys. 27, 41-85 (1989). Google Scholar
  3. Blake, G. A., Mundy, L. G., Carlstrom, J. E., Padin, S., Scott, S. L., Scoville, N. Z. & Woody, D. P. A λ = 1.3 Millimeter Aperture Synthesis Molecular Line Survey of Orion Kleinmann-Low Astrophys. J. 472, L49-L52 (1996). Google Scholar
  4. Tercero, B., Cernicharo, J., Pardo, J. R. & Goicoechea, J. R. A line confusion limited millimeter survey of Orion KL: I. Sulfur carbon chains Astron. Astrophys. 517:A96, (2010). Google Scholar
  5. Favre, C., Wootten, H. A., Remijan, A. J., Brouillet, N., Wilson, T. L., Despois, D. & Baudry, A. High-resolution Expanded Very Large Array Image of Dimethyl Ether (CH3)2O in Orion-KL Astrophys. J., Lett. 739:L12, (2011). Google Scholar
  6. Fortman, S. M., McMillan, J. P., Neese, C. F., Remijan, A., Wilson, T. L. & De Lucia, F. C. An analysis of a preliminary ALMA Orion KL spectrum via the use of complete experimental spectra from the laboratory J. Mol. Spectrosc. 280, 11-20 (2012). Google Scholar