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Multiwavelength observations of the supernova remnant G349.7+02 interacting with a molecular cloud | | J. S. Lazendic
; M. Wardle
; J. B. Whiteoak
; M. G. Burton
; A. J. Green
; | | Date: |
13 Sep 2004 | | Subject: | astro-ph | | Affiliation: | Sydney U/CfA), M. Wardle (Macquarie), J. B. Whiteoak (ATNF), M. G. Burton (UNSW) and A. J. Green (Sydney U | | Abstract: | We present molecular-line observations at millimetre, centimetre and infrared wavelengths of the region containing OH(1720 MHz) masers in the supernova remnant (SNR) G349.7+0.2. Several molecular transitions were observed between 1.6 and 3 mm to constrain the physical parameters of the molecular cloud interacting with the SNR and to investigate the effects of the SNR shock on the gas chemistry. The observed molecular-line profiles imply the presence of shocked gas with a density around 10^5 cm^{-3} and temperature around 30 K. Our measurements indicate that the abundances of molecular species such as CS, HCN and H2CO are unaffected by the shocks, while HCO+, SO and SiO could be enhanced. We detected shock-excited near-infrared H2 emission towards the centre of the SNR, revealing highly clumped molecular gas. Furthermore, we detected OH absorption at 1665 and 1667 MHz which shows a good correlation with the shocked H2 emission and the masers. We also found maser emission at 1665 MHz near the OH(1720 MHz) masers in this SNR, which could be excited by the shock-heated dust, evident in the mid-infrared wavelengths, or it could be pointing to an unrelated protostellar object along the line of sight to the remnant. We also detected 1665 and 1667 MHz OH masers towards the ultra-compact HII region IRAS 17147-3725 located to the southeast of the SNR. We found no 4.7- or 6-GHz excited-state OH masers or 6-GHz CH3OH maser towards either the SNR or the HII region. Weak H2CO absorption was detected only towards the HII region. | | Source: | arXiv, astro-ph/0409302 | | Services: | Forum | Review | PDF | Favorites | |
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