RT Journal Article
T1 Rotational spectrum and tentative detection of DCOOCH3–Methyl formate in Orion
A1 Margulès, L.
A1 Huet, Thérèse R.
A1 Demaison, J.
A1 Carvajal Zaera, Miguel
A1 Kleiner, I.
A1 Møllendal, H.
A1 Tercero, B.
A1 Marcelino, N.
A1 Cernicharo, J.
AB New centimeter-wave (7–80 GHz) and submillimeter-wave (580–661 GHz) spectra of a deuterated species ofmethyl formate (DCOOCH3) have been measured. Transitions with a maximum value of J = 64 and K = 36 havebeen assigned and fitted together with previous measurements. The internal rotation of this compound was treatedusing the so-called rho axis method. A total of 1703 transitions were fitted using this method. Only 24 parameterswere employed in the final fit, which has an rms deviation of 94.2 kHz. The dipole moment and the nuclearquadrupole coupling constants of the deuterated specie have also been obtained. This new study has permitted atentative detection of DCOOCH3 in Orion with the IRAM 30 m telescope based on the observation of more than100 spectral features with low blending effects among the 400 lines expected in the observed frequency domain (forwhich over 300 are heavily blended with other species). These 100 transitions are above noise and confusion limitedwithout heavy blending and cannot be assigned to any other species. Moreover, none of the strongest unblendedtransitions is missing. The derived source-averaged total column density for DCOOCH3 is 7.8 × 1014 cm−2and theDCOOCH3/HCOOCH3 column density ratio varies between 0.02 and 0.06 in the different cloud componentsof Orion. This value is consistent with the deuteration enhancement found for other species in this cloud.
PB American Astronomical Society
SN 0004-637X
SN 1538-4357 (electrónico)
YR 2010
FD 2010
LK http://hdl.handle.net/10272/8262
UL http://hdl.handle.net/10272/8262
LA eng
NO Margulès, L., Huet, T. R., Demaison, J., Carvajal Zaera, M., Kleiner, I., Møllendal, H., Tercero, B., Marcelino, N., Cernicharo, J. :"Rotational spectrum and tentative detection of DCOOCH3–Methyl formate in Orion". The Astrophysical Journal. Vol. 714, págs. 1120–1132 (2010). ISSN 0004-637X
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026