Volume 572, December 2014
|Number of page(s)||64|
|Section||Interstellar and circumstellar matter|
|Published online||28 November 2014|
Max-Planck-Institut für Radioastronomie,
Auf dem Hügel 69, 53121
2 European Organisation for Astronomical Research in the Southern Hemisphere (ESO), Karl-Schwarzschild-Straße 2, 85748 Garching, Deutschland
3 Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, 58090 Morelia, Mexico
4 Academia Sinica, Institute of Astronomy and Astrophysics, PO Box 23-141, 106 Taipei, Taiwan
Received: 7 March 2014
Accepted: 25 August 2014
The object W33 is a giant molecular cloud that contains star forming regions at various evolutionary stages from quiescent clumps to developed H ii regions. Since its star forming regions are located at the same distance and the primary material of the birth clouds is probably similar, we conducted a comparative chemical study to trace the chemical footprint of the different phases of evolution. We observed six clumps in W33 with the Atacama Pathfinder Experiment (APEX) telescope at 280 GHz and the Submillimeter Array (SMA) at 230 GHz. We detected 27 transitions of 10 different molecules in the APEX data and 52 transitions of 16 different molecules in the SMA data. The chemistry on scales larger than ~0.2 pc, which are traced by the APEX data, becomes more complex and diverse the more evolved the star forming region is. On smaller scales traced by the SMA data, the chemical complexity and diversity increase up to the hot core stage. In the H ii region phase, the SMA spectra resemble the spectra of the protostellar phase. Either these more complex molecules are destroyed or their emission is not compact enough to be detected with the SMA. Synthetic spectra modelling of the H2CO transitions, as detected with the APEX telescope, shows that both a warm and a cold component are needed to obtain a good fit to the emission for all sources except for W33 Main1. The temperatures and column densities of the two components increase during the evolution of the star forming regions. The integrated intensity ratios N2H+(3−2)/CS(6−5) and N2H+(3−2)/H2CO(42,2–32,1) show clear trends as a function of evolutionary stage, luminosity, luminosity-to-mass ratio, and H2 peak column density of the clumps and might be usable as chemical clocks.
Key words: stars: formation / astrochemistry / stars: protostars / ISM: individual objects: W33 / submillimeter: ISM / ISM: molecules
The integrated intensity line and continuum maps of the APEX telescope and the SMA are only available as FITS files at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (220.127.116.11) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/572/A63
Appendices are available in electronic form at http://www.aanda.org
© ESO, 2014
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