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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents



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ID: 125340.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
A 13CO and C18O survey of the molecular gas around young stellar clusters within 1 kiloparsec of the sun
Authors:Ridge, N. A.; Wilson, T. L.; Megeath, S. T.; Allen, L. E.; Myers, P. C.
Language:English
Date of Publication (YYYY-MM-DD):2003-07
Title of Journal:Astronomical Journal
Journal Abbrev.:Astron. J.
Volume:126
Issue / Number:1
Start Page:286
End Page:310
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:As the first step of a multiwavelength investigation into the relationship between young stellar clusters and their environment, we present fully sampled maps in the J = 1 - 0 lines of (CO)-C-13 and (CO)-O-18 and the J = 2 - 1 line of (CO)-O-18 for a selected group of 30 young stellar groups and clusters within 1 kpc of the Sun. This is the first systematic survey of these regions to date. The clusters range in size from several stars to a few hundred stars. Thirty fields ranging in size from 8' x 8' to 30' x 60' were mapped with 47" resolution simultaneously in the two J = 1 - 0 lines at the Five College Radio Astronomy Observatory. Seventeen sources were mapped over fields ranging in size from 3' x 3' to 13' x 13' in the J = 2 - 1 line with 35" resolution at the Submillimeter Telescope Observatory. We compare the cloud properties derived from each of the three tracers in order to better understand systematic uncertainties in determining masses and line widths. Cloud masses are determined independently using the (CO)-C-13 and (CO)-O-18 transitions; these masses range from 30 to 4000 M-.. Finally, we present a simple morphological classification scheme, which may serve as a rough indicator of cloud evolution.
Free Keywords:circumstellar matter, ISM : clouds, radio emission lines, stars : formation
Comment of the Author/Creator:Date: 2003, JUL
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Univ Massachusetts, Five Coll Radio Astron Observ, Dept Astron, Amherst, MA 01003 USA.; Univ Arizona, Submillimeter Telescope Observ, Tucson, AZ 85721 USA.; Max Planck Inst Radioastron, D-53121 Bonn, Germany.; Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA.
Identifiers:ISI:000183905500026 [ID No:1]
ISSN:0004-6256 [ID No:2]
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