Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.180g&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Other
Scientific paper
FUV radiation strongly affects the chemical state of interstellar gas and dust, from protoplanetary disks to entire galaxies. Warm and dense photodissociation regions (PDRs) are the transition layers between the ionized gas illuminated by intense UV fields from nearby OB massive stars and the cold neutral gas shielded from UV radiation. Despite their relevance in a wider astrophysical context, the observational limits of the chemical complexity in FUV--illuminated environments are poorly constrained. In fact, no unbiased line survey of any archetypal interstellar PDR had been carried out with the IRAM-30m telescope. We have started a shallow line survey of the Orion Bar (the prototypical warm PDR) with the IRAM-30m telescope using the new EMIR receivers. We have identified tens of lines (with detection densities of ~4 lines/GHz). Half of the detected lines have been assigned to: HCN, HCO, C_3H_2, HCO^+, SiO, C_4H, HOC^+, CS, CH_3OH, H_2CO, SO, C_2H, H_2CS, SO_2, HNC, C_3H, DCN, HCS^+, NS, SO^+, etc. Some of them were not considered to be specific ``PDR-tracers'' before. The other set lines comes from isotopologues (D, 18O, 34S, ...), vibrationally excited levels and more complex organic molecules. The latter ones were clearly not expected in a region illuminated by a strong FUV field. In this contribution we summarize the current status of the proyect and present the first set of line detections and results.
Cernicharo Jose
Cuadrado Sílvia
Esplugues G. B.
Fuente Asuncion
Garcia-Burillo Santiago
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