Molecular abundances in OMC-1 - the chemical composition of interstellar molecular clouds and the influence of massive star formation

Journal Article · Wed Apr 01 04:00:00 EST 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165165· OSTI ID:5966263

Blake, G A; Sutton, E C; Masson, C R; Phillips, T G

The chemical composition of the various regions in the core of OMC-1 is investigated based on millimeter-wave spectral line survey results. The cool and extended quiescent ridge gas is characterized by fairly simple carbon-rich species whose abundances are similar to those found in other well-studied objects like TMC-1 and Sgr B2. Its chemical composition is reasonably well predicted by purely gas phase ion-molecule reaction networks. Abundances in the high-velocity plateau are dominated by outflow from IRc 2. The hot core is interpreted as a particularly large and dense clump or clumps of gas left over from the formation of IRc 2. The production of complex oxygen-rich species such as CH3OH in the compact ridge is accomplished by radiation association reactions between smaller molecular ions in the quiescent cloud material and highly abundant neutral species such as HCN and H/sub 2/O supplied by the outflow from IRc 2. 117 references.

• Research Organization: California Univ., Berkeley; California Institute of Technology, Pasadena
• OSTI ID: 5966263
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 315; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102 -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
CHEMICAL COMPOSITION
COSMIC GASES
EMISSION SPECTRA
EQUILIBRIUM
FLUIDS
GASES
INTERSTELLAR SPACE
LTE
MASS
MOLECULES
NEBULAE
SPACE
SPECTRA
STAR EVOLUTION
TEMPERATURE DISTRIBUTION