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http://hdl.handle.net/2289/2517| Title: | A spectral line survey of IRAS 17470-2853 from 86.1 to 92.1 GHz |
| Authors: | Kim, Hun-Dae Balasubramanyam, R. Burton, M.G. |
| Keywords: | HII regions ISM: individual (IRAS 17470-2853 = G0.55– 0.85) ISM: molecules ISM: abundances stars: formation radio lines: ISM |
| Issue Date: | 2002 |
| Publisher: | Astronomical Society of Australia |
| Citation: | Publications of the Astronomical Society of Australia, 2002, Vol.19, p505-514 |
| Abstract: | We present results from a spectral line survey of the young stellar object IRAS17470-2853, undertaken to examine chemical changes during the evolution from hot molecular cores to ultracompact HII regions. Observations were carried out with the Mopra 22m radio telescope in the frequency range from 86.1 to 92.1GHz. A total of 21 lines from 9 molecules were detected. Except for CH3CN they are all simple molecules. We compare the results to the ultracompact HII region G34.3+0.15, where spectral line surveys in the frequency range 80-115GHz and 330-360GHz have been performed. While the molecular lines detected are similar, their widths and intensities are somewhat narrower and lower, respectively, in IRAS 17470-2853. The typical line width of ~5kms-1 indicates relatively quiet or quasi-thermal emission. On the other hand, a significant difference in TA* (HNC)/TA*(HCN) has been found: 0.8 for IRAS 17470-2853 compared to 2.6 for G34.3+0.15. The broad line width of SiO (υv=0, J=2-1), ~9kms-1, suggests that IRAS 17470-2853 is experiencing a shock generated by the embedded object. Column densities, or lower limits to them, are derived for observed molecules. |
| Description: | Restricted Access. Please click on the alternative location for the open-access full text. |
| URI: | http://hdl.handle.net/2289/2517 |
| ISSN: | 1323-3580 |
| Alternative Location: | http://adsabs.harvard.edu/cgi-bin/bib_query?2002PASA...19..505K http://dx.doi.org/10.1071/AS01094 |
| Copyright: | 2002 Astronomical Society of Australia |
| Appears in Collections: | Research Papers (A&A) |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2002 PASA V19 p505.pdf Restricted Access | Restricted Access | 335.43 kB | Adobe PDF | View/Open Request a copy |
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