J/ApJS/153/523 Starless cores in CS(3-2) and DCO^+^(2-1) lines (Lee+, 2004) ================================================================================ A survey for infall motions toward starless cores. III. CS (3-2) and DCO^+^ (2-1) observations. Lee C.W., Myers P.C., Plume R. =2004ApJS..153..523L ================================================================================ ADC_Keywords: Interstellar medium ; Surveys ; Line Profiles Keywords: ISM: globules - ISM: kinematics and dynamics - stars: formation Abstract: We present CS(3-2) and DCO^+^(2-1) observations of 94 starless cores and compare the results with previous CS(2-1) and N_2_H^+^(1-0) observations to study inward motions in starless cores. Eighty-four cores were detected in both CS and DCO^+^ lines. We identify 18 infall candidates based on observations of CS(3-2), CS(2-1), DCO^+^(2-1) and N_2_H^+^(1-0). The eight best candidates, L1355, L1498, L1521F, L1544, L158, L492, L694-2, and L1155C-1, each show at least four indications of infall asymmetry and no counterindications. Fits of the spectra to a two-layer radiative transfer model in ten infall candidates suggest that the median effective line of sight speed of the inward-moving gas is ~0.07km/s for CS(3-2) and ~0.04km/s for CS(2-1). Description: We observed both the CS(3-2) and the DCO^+^(2-1) transitions at the NRAO 12m telescope in two seasons, 1998 June and October. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 96 94 Starless cores observed in CS(3-2) and/or DCO^+^(2-1) lines -------------------------------------------------------------------------------- See also: J/ApJ/526/788 : Survey of infall motions toward starless cores (Lee+, 1999) J/ApJS/123/233 : Catalog of Optically selected cores (Lee+, 1999) J/ApJS/152/81 : CO survey toward starless cores (Park+, 2004) J/ApJ/664/928 : Starless cores in HCN(J=1-0) (Sohn+ 2007) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 13 A13 --- [LM99] Observed region name 15- 16 I2 h RAh Central hour of right ascension (B1950) 18- 19 I2 min RAm Central minute of right ascension (B1950) 21- 24 F4.1 s RAs Central second of right ascension (B1950) 26 A1 --- DE- Central declination sign (B1950) 27- 28 I2 deg DEd Central degree of declination (B1950) 30- 31 I2 arcmin DEm Central arcminute of declination (B1950) 33- 34 I2 arcsec DEs Central arcsecond of declination (B1950) 36- 37 A2 --- l_TCS [<= ] Limit flag on TCS (1) 38- 41 F4.2 K TCS ? Antenna temperature of CS(3-2) line (146.97GHz) 43- 44 A2 --- l_TDCO [<= ] Limit flag on TDCO (1) 45- 48 F4.2 K TDCO ? Antenna temperature of DCO^+^(2-1) (144.08GHz) 50- 55 F6.2 km/s VCS ? Velocity of CS(3-2) line (146.97GHz) (2) 57- 60 F4.2 km/s e_VCS ? VCS uncertainty 62- 66 F5.2 km/s VDCO ? Velocity of DCO^+^(2-1) line (144.08GHz) (2) 68- 71 F4.2 km/s e_VDCO ? VDCO uncertainty 73- 77 F5.2 --- dVCS ? Normalized velocity difference of CS(3-2) (3) 79- 82 F4.2 --- e_dVCS ? dVCS uncertainty 84- 88 F5.2 --- dVDCO ? Normalized velocity difference of DCO^+^(2-1) (3) 90- 93 F4.2 --- e_dVDCO ? dVDCO uncertainty 95 I1 --- src [1/2] Source selection (4) 96 A1 --- f_[LM99] [v] Flag for L1271-1 (5) -------------------------------------------------------------------------------- Note (1): For undetected lines three {sigma}-values of the observed lines are given. Note (2): The velocities of the detected lines were obtained by Gaussian fits of the lines. All designated errors are 1{sigma} values from the fits. Note (3): Normalized velocity differences ({delta}V) of CS(3-2) and DCO^+^ with respect to N_2_H^+^ velocities from Lee et al. 1999, Cat. J/ApJ/526/788. For example, {delta}V_CS32_ is defined as {delta}V_CS32_=(V_CS32_-V_N2H+_)/{Delta}V_N2H+_. The 1{sigma} propagation errors are given at each value of {delta}V. Note (4): Selection criterion source as follows: 1 = selected from Lee et al. 1999, Cat. J/ApJ/526/788 2 = selected from Lee & Myers, 1999, Cat. J/ApJS/123/233 Note (5): v = L1271-1 source has two more velocity components of V_LSR_=-12.87, -6.96km/s. -------------------------------------------------------------------------------- History: From electronic version of the journal References: Lee et al. Paper I. 1999ApJ...526..788L. Cat. J/ApJ/526/788. Lee et al. Paper II. 2001ApJS..136..703L. ================================================================================ (End) Emmanuelle Perret [CDS] 29-Sep-2010