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Dense Cores in Dark Clouds. XIV. N2H+ (1-0) Maps of Dense Cloud Cores
We present results of an extensive mapping survey of N2H+ (1-0) in about 60 low-mass cloud cores already mapped in the NH3 (1, 1) inversion transition line. The survey has been carried out at theExpand
On the internal structure of starless cores - I. Physical conditions and the distribution of CO, CS, N$\mathsf{_2}$H$\mathsf{^+}$, and NH$\mathsf{_3}$ in L1498 and L1517B
We have characterized the physical structure and chemical composition of two close-to-round starless cores in Taurus-Auriga, L1498 and L1517B. Our analysis is based on high angular resolutionExpand
Probing the Evolutionary Status of Starless Cores through N2H+ and N2D+ Observations
We have undertaken a survey of N2H+ and N2D+ toward 31 low-mass starless cores using the IRAM 30 m telescope. Our main objective has been to determine the abundance ratio of N2D+ and N2H+ toward theExpand
CO Isotopologues in the Perseus Molecular Cloud Complex: the X-factor and Regional Variations
We use data gathered by the COMPLETE survey of star-forming regions to find new calibrations of the X-factor and 13CO abundance within the Perseus molecular cloud. We divide Perseus into sixExpand
Molecular Ions in L1544. II. The Ionization Degree
The maps presented in Paper I are here used to infer the variation of the column densities of HCO+, DCO+, N2H+, and N2D+ as a function of distance from the dust peak. These results are interpretedExpand
Systematic Molecular Differentiation in Starless Cores
We present evidence that low-mass starless cores, the simplest units of star formation, are systematically differentiated in their chemical composition. Some molecules, including CO and CS, almostExpand
An Ammonia Spectral Atlas of Dense Cores in Perseus
We present ammonia observations of 193 dense cores and core candidates in the Perseus molecular cloud made using the Robert F. Byrd Green Bank Telescope. We simultaneously observed the NH3(1,1),Expand
Molecular ions in L1544. I. Kinematics
We have mapped the dense dark core L1544 in H13CO+(1-0), DCO+(2-1), DCO+(3-2), N2H+(1-0), NTH+(3-2), N2D+(2-1), N2D+(3-2), C18O(1-0), and C17O(1-0) using the IRAM 30-m telescope. We have obtainedExpand
L1544: A Starless dense core with extended inward motions
We present a multiline study of the dense core L1544 in the Taurus molecular complex. Although L1544 does not harbor an embedded star, it presents several characteristics of cores that have alreadyExpand