Journal
ASTROPHYSICAL JOURNAL
Volume 714, Issue 2, Pages 1120-1132Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/714/2/1120
Keywords
ISM: molecules; line: identification; methods: data analysis; methods: laboratory; methods: observational; submillimeter: ISM
Categories
Funding
- Andalusian Government (Spain) [P07-FQM-03014]
- Spanish MICINN [AYA2006-14786, AYA2009-07304, CSD2009-00038]
- National Physique et Chimie du Milieu Interstellaire
Ask authors/readers for more resources
New centimeter-wave (7-80 GHz) and submillimeter-wave (580-661 GHz) spectra of a deuterated species of methyl formate (DCOOCH3) have been measured. Transitions with a maximum value of J = 64 and K = 36 have been assigned and fitted together with previous measurements. The internal rotation of this compound was treated using the so-called rho axis method. A total of 1703 transitions were fitted using this method. Only 24 parameters were employed in the final fit, which has an rms deviation of 94.2 kHz. The dipole moment and the nuclear quadrupole coupling constants of the deuterated specie have also been obtained. This new study has permitted a tentative detection of DCOOCH3 in Orion with the IRAM 30 m telescope based on the observation of more than 100 spectral features with low blending effects among the 400 lines expected in the observed frequency domain (for which over 300 are heavily blended with other species). These 100 transitions are above noise and confusion limited without heavy blending and cannot be assigned to any other species. Moreover, none of the strongest unblended transitions is missing. The derived source-averaged total column density for DCOOCH3 is 7.8 x 10(14) cm(-2) and the DCOOCH3/HCOOCH3 column density ratio varies between 0.02 and 0.06 in the different cloud components of Orion. This value is consistent with the deuteration enhancement found for other species in this cloud.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available