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Title: IRAM 30 m large scale survey of {sup 12}CO(2-1) and {sup 13}CO(2-1) emission in the Orion molecular cloud

Using the IRAM 30 m telescope, we have surveyed a 1 × 0.°8 part of the Orion molecular cloud in the {sup 12}CO and {sup 13}CO (2-1) lines with a maximal spatial resolution of ∼11'' and spectral resolution of ∼0.4 km s{sup –1}. The cloud appears filamentary, clumpy, and with a complex kinematical structure. We derive an estimated mass of the cloud of 7700 M {sub ☉} (half of which is found in regions with visual extinctions A{sub V} below ∼10) and a dynamical age for the nebula of the order of 0.2 Myr. The energy balance suggests that magnetic fields play an important role in supporting the cloud, at large and small scales. According to our analysis, the turbulent kinetic energy in the molecular gas due to outflows is comparable to turbulent kinetic energy resulting from the interaction of the cloud with the H II region. This latter feedback appears negative, i.e., the triggering of star formation by the H II region is inefficient in Orion. The reduced data as well as additional products such as the column density map are made available online (http://userpages.irap.omp.eu/∼oberne/Olivier{sub B}erne/Data).
Authors:
;  [1] ;  [2]
  1. Centro de Astrobiologá (CSIC/INTA), Ctra. de Torrejón a Ajalvir, km 4, E-28850, Torrejón de Ardoz, Madrid (Spain)
  2. NRAO, 520 Edgemont Road, Charlottesville, VA 22902 (United States)
Publication Date:
OSTI Identifier:
22370351
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 795; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CARBON 12; CARBON 13; COMPARATIVE EVALUATIONS; COSMIC GASES; DENSITY; EMISSION; ENERGY BALANCE; FEEDBACK; MAGNETIC FIELDS; MAPS; MASS; MOLECULES; NEBULAE; SPATIAL RESOLUTION; TELESCOPES