Shock Chemistry in Bipolar Molecular Outflows

Bachiller, R.; Gutiérrez, Manuel Pérez

doi:10.1007/978-94-011-5608-0_14

Cited by 6 publications

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Methanol (CH 3 OH) has been extensively observed in association with regions of star formation (cf Bachiller and Pérez Gutiérrez (1997), Menten et al (1999)) and in the galactic centre (Martín-Pintado et al 1999). Line surveys show many lines of both A-and E-type methanol to be present in the sub-millimetre part of the spectrum (Schilke et al 1999).…”

Section: Introductionmentioning

confidence: 99%

The rotational excitation of methanol by helium at low temperatures

Pottage

Flower

Davis

2001

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

We report new calculations of the CH3OH-He interaction potential. The results of these computations have been fitted by an expansion in terms of the coordinates of the atom with respect to a coordinate system fixed in the molecule, and the internal rotation angle of the methyl radical. The potential was then used to determine rotational excitation cross sections by means of the quantum mechanical, coupled states method. It was assumed (i) that the methyl radical was fixed at its minimum energy conformation, or (ii) that the interaction potential was an average with respect to the ground state torsional eigenfunctions of A- and E-type methanol. From the cross sections, thermally averaged rate coefficients were calculated at kinetic temperatures T = 10 and 20 K. The `propensity rules' governing the collisional transitions were examined and compared with the results of microwave double-resonance experiments. Finally, the rate coefficients have been used to compute the excitation temperature of the 12.18 GHz transition of interstellar methanol, which has been observed in absorption against the 2.7 K cosmic microwave background radiation.

show abstract

Section: Introductionmentioning

confidence: 99%

The rotational excitation of methanol by helium at low temperatures

Pottage

Flower

Davis

2001

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

show abstract

Bipolar Outflows in Stellar Astrophysics

Frank

2002

Origin of Elements in the Solar System

View full text Add to dashboard Cite

Multiple shocks around the low-luminosity protostar IRAS 16293-2422

Castets

Ceccarelli

Loinard³

et al. 2001

A&A

View full text Add to dashboard Cite

+ line emission is associated with the binary system IRAS 16293-2422, presumably because the gas surrounding it is warmer. In addition to the previously known North-East-South-West outflow powered by IRAS 16293-2422, we suggest the existence of a second outflow in this binary system. We also report the discovery of a North-West-South-East flow driven by 16293E. The impact of the outflows with the ambient cloud is probed by the SiO and H2CO maps, which reveal the presence of at least four, possibly six shocked regions. We discuss in some detail the nature of the shocks, deriving densities, temperatures and column densities of the shocked gas of the various observed components. We suggest that the wind and ambient shocks are probed by the high and low velocity components observed in the SiO lines. The morphology of the H2CO, SiO and [O i] line emissions are rather different, showing almost all kind of combinations. We discuss the origin of these differences in terms of the age of the shocks, the pre-shock densities and of the composition of the ices which are partially desorbed by the shocks.

show abstract

Shock Chemistry in Bipolar Molecular Outflows

Cited by 6 publications

References 15 publications

The rotational excitation of methanol by helium at low temperatures

The rotational excitation of methanol by helium at low temperatures

Bipolar Outflows in Stellar Astrophysics

Multiple shocks around the low-luminosity protostar IRAS 16293-2422

Contact Info

Product

Resources

About