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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Large-scale structure of the molecular gas in Taurus revealed by high linear dynamic range spectral line mapping
Astrophysical Journal, Volume 680, No. 1, Year 2008
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Description
We report the results of a 100 deg2 survey of the Taurus molecular cloud region in 12CO and 13CO J = 1 → 0. The image of the cloud in each velocity channel includes ≃3 × 10 6 Nyquist-sampled pixels on a 20′ grid. The high sensitivity and large spatial dynamic range of the maps reveal a very complex, highly structured cloud morphology, including filaments, cavities, and rings. The axes of the striations seen in the 12CO emission from relatively diffuse gas are aligned with the direction of the magnetic field. We have developed a statistical method for analyzing the pixels in which 12CO but not 13CO is detected, which allows us to determine the CO column in the diffuse portion of the cloud, as well as in the denser regions in which we detect both isotopologues. Using a column-density-dependent model for the CO fractional abundance, we derive the mass of the region mapped to be 2.4 × 104 M⊙, more than twice as large as would be obtained using a canonical fixed fractional abundance of 13CO, and a factor of 3 greater than would be obtained considering only the high column density regions. We determine that half the mass of the cloud is in regions having column density below 2.1 × 1021 cm-2. The distribution of young stars in the region covered is highly nonuniform, with the probability offinding a star in a pixel with a specified column density rising sharply for N(H2) = 6 × 1021 cm-2. We determine a relatively low star formation efficiency (mass of young stars/mass of molecular gas), between 0.3% and 1.2%, and an average star formation rate during the past 3 Myr of 8 × 10-5 stars yr-1. © 2008. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Goldsmith, Paul F.
United States, Pasadena
Jet Propulsion Laboratory
Li, D. H.
United States, Pasadena
Jet Propulsion Laboratory
Statistics
Citations: 353
Authors: 2
Affiliations: 3
Identifiers
Doi:
10.1086/587166
ISSN:
0004637X
Research Areas
Environmental
Study Design
Cross Sectional Study
Study Approach
Quantitative