The Detection of Cyanomethanimine in the ISM

Cyanomethanimine, HNCHCN, is a slightly unsaturated sibling of aminoacetonitrile, H2NCH2CN. It has been identified recently by
D. P. Zaleski, N. A. Seifert, A. L. Steber, M. T. Muckle, R. A. Loomis, J. F. Corby, O. Martinez, Jr., K. N. Crabtree, P. R. Jewell, J. M. Hollis, F. J. Lovas, D. Vasquez, J Nyiramahirw1, N. Sciortino, K. Johnson, M. C. McCarthy, A. J. Remijan, and B. H. Pate,
Detection of E-Cyanomethanimine toward Sagittarius B2(N) in the Green Bank Telescope PRIMOS Survey
Astrophys. J 765, Art. No. 10 (2013).
8 rotational transitions were detected for the higher energy E-conformer and none for the lower energy Z-conformer. The non-observation of the Z-conformer was attributed to the much smaller dipole moment components. The transitions had J < 5 and Ka < 1, occured between 9 and 48 GHz and were all seen in absorption. Some transitions displayed 14N hyperfine splitting. The lines were detected in the two well known velocity components 64 km/s and 82 km/s, though (partial) overlap occured for the latter in some lines. A rotational temperature of about 8 K was derived.
These, as well as other observations of fairly complex molecules toward Sgr B2(N) at apperently low rotational temperatures, may be related to findings by
M. A. Requena-Torres, J. Martín-Pintado, A. Rodríguez-Franco, S. Martín, N. J. Rodríguez-Fernández, and P. de Vicente,
Organic Molecules in the Galactic Center – Hot Core Chemistry without Hot Cores
Astron. Astrophys. 455, 971–985 (2006);
and by
M. A. Requena-Torres, J. Martín-Pintado, S. Martín, and M. R. Morris,
The Galactic Center: The Largest Oxygen-bearing Organic Molecule Repository
Astrophys. J. 672, 352–360 (2008).


Contributor(s): H. S. P. Müller; 02, 2013