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CONFIRMATION OF INTERSTELLAR METHYLCYANODIACETYLENE

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/30379

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Title: CONFIRMATION OF INTERSTELLAR METHYLCYANODIACETYLENE
Creators: Snyder, L. E.; Hollis, J. M.; Jewell, P. R.; Lovas, F. J.; Remijan, Anthony J.
Issue Date: 2005
Abstract: Ten spectral lines of the symmetric top molecule methylcyanodiacetylene (CH$_3$C$_5$N) have been detected with the 100-m Green Bank Telescope (GBT) toward the Taurus molecular cloud TMC-1. Both K=0 and K=1 components of the 12,K-11,K, 13,K-12,K, 14,K-13,K, 15,K-14,K, and 16,K-15,K transitions were observed. Consistent with $\sim$10 K kinetic temperature for the TMC-1 dark dust cloud, no higher K components were detected. The CH$_3$C$_5$N excitation temperature range is 2.7 K to 4.0 K for both K=0 and K=1 ladders, similar to that previously reported for methylcyanoacetylene (CH$_3$C$_3$N). The abundance ratio of CH$_3$C$_5$N to CH$_3$C$_3$N is in the range of 0.5 to 1, but most probably closer to $\sim$0.5 than 1. Methyl cyanide (CH$_3$CN), CH$_3$C$_3$N, and CH$_3$C$_5$N are all found in TMC-1 in decreasing relative abundance, suggesting that simple carbon addition may be possible in dark clouds.
URI: http://hdl.handle.net/1811/30379
Other Identifiers: 2005-RA-02
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