期刊
ASTROPHYSICAL JOURNAL
卷 691, 期 2, 页码 1754-1763出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/691/2/1754
关键词
stars: formation; ISM: molecules
资金
- National Science Foundation [AST 05-40399]
- NSF Astronomy and Astrophysics Postdoctoral Fellowship [AST-0502605]
- NSERC of Canada
- NRAO Student Observing Support [GSSP06-0015]
- Spitzer Space Telescope Fellowship Program
In this paper, we study the determinants of starless core temperatures in the Perseus molecular cloud. We use NH3 (1,1) and (2,2) observations to derive core temperatures (T-kin) and data from the COMPLETE Survey of Star-Forming Regions and the c2d Spitzer Legacy Survey for observations of the other core and molecular cloud properties. The kinetic temperature distribution probed by NH3 is in the fairly narrow range of similar to 9-15 K. We find that cores within the clusters IC348 and NGC1333 are significantly warmer than field starless cores, and T-kin is higher within regions of larger extinction-derived column density. Starless cores in the field are warmer when they are closer to Class 0/I protostars, but this effect is not seen for those cores in clusters. For field starless cores, T-kin is higher in regions in which the (CO)-C-13 line width and the 1.1 mm flux from the core are larger, and T-kin is lower when the the peak column density within the core and average volume density of the core are larger. There is no correlation between T-kin and (CO)-C-13 line width, 1.1 mm flux, density, or peak column density for those cores in clusters. The temperature of the cloud material along the line of sight to the core, as measured by CO or far-infrared emission from dust, is positively correlated with core temperature when considering the collection of cores in the field and in clusters, but this effect is not apparent when the two subsamples of cores are considered separately.
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