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J/ApJ/668/1042      Dense cores in Perseus molecular cloud   (Kirk+, 2007)

Dynamics of dense cores in the Perseus molecular cloud. Kirk H., Johnstone D., Tafalla M. <Astrophys. J., 668, 1042-1063 (2007)> =2007ApJ...668.1042K
ADC_Keywords: Molecular clouds ; Infrared sources ; Millimetric/submm sources Keywords: infrared: ISM - ISM: individual (Perseus) - ISM: structure - stars: formation - submillimeter Abstract: We survey the kinematics of over 150 candidate (and potentially star-forming) dense cores in the Perseus molecular cloud with pointed N2H+(1-0) and simultaneous C18O(2-1) observations. Our detection rate of N2H+ is 62%, rising to 84% for SCUBA-selected targets. In agreement with previous observations, we find that the dense N2H+ targets tend to display nearly thermal line widths, particularly those that appear to be starless (using Spitzer data), indicating that turbulent support on the small scales of molecular clouds is minimal. For those N2H+ targets that have an associated SCUBA dense core, we find that their internal motions are more than sufficient to provide support against the gravitational force on the cores. Description: We made pointed observations of the 157 targets using the 30m IRAM telescope in Pico Veleta, Spain. We observed N2H+(1-0) in both polarizations using the (AB) 100GHz receivers and simultaneously observed C18O(2-1) in both polarizations using the (CD) 230GHz receivers, in both cases utilizing frequency switching File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 52 157 Target Properties table3.dat 56 425 Parameters of spectral fitting for N2H+ table4.dat 50 472 Parameters of Spectral Fitting for C18O table6.dat 78 87 Properties of the submillimeter cores identified in the Perseus SCUBA map with 3" pixels
See also: J/ApJ/646/1009 : Structures of dust in Perseus molecular cloud (Kirk+, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [KJT2007] Sequential number 5- 6 I2 h RAh Right ascension (J2000.0) 8- 9 I2 min RAm Right ascension (J2000.0) 11- 14 F4.1 s RAs Right ascension (J2000.0) 16 A1 --- DE- Declination sign (J2000.0) 17- 18 I2 deg DEd Declination (J2000.0) 20- 21 I2 arcmin DEm Declination (J2000.0) 23- 26 F4.1 arcsec DEs Declination (J2000.0) 28 A1 --- Sel [PES] Selection method (1) 30- 32 A3 --- Cross? [Yes No] Were offset positions observed? 34- 35 I2 --- SMM ? SCUBA core reference number (see table6, [KJT2007] SMM NN in Simbad) 37- 41 F5.2 Jy Flux Total SCUBA flux at 850um within the IRAM beam (2) 43- 44 I2 --- [JJK2007] ? Spitzer protostar reference number (from Jogensen et al. 2007ApJ...656..293J) 46- 47 I2 --- EReg ? Extinction Region number (from Paper I, Kirk et al., Cat. J/ApJ/646/1009) [KJD2006] EC NN in Simbad 49- 52 F4.1 mag AV Mean extinction within the IRAM beam
Note (1): Target selection based as follows: S = on SCUBA cores P = on Palomar plate candidates E = on 2MASS extinction structures Note (2): derived from the 6" map of Paper I, Kirk et al., J/ApJ/646/1009.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [KJT2007] Source identification number (1) 5- 6 I2 --- oRA Offset in Right Ascension (2) 8- 9 I2 --- oDE Offset in Declination (2) 11- 15 F5.2 km/s Vel ? CLASS derived centroid velocity (3) 17- 20 F4.2 km/s sigma ? CLASS derived velocity dispersion (FWHM) 22- 24 I3 m/s e_sigma ? Error in sigma 26- 30 F5.2 --- tau ? CLASS derived optical depth 32- 36 F5.2 --- e_tau ? Error in Depth 38- 41 F4.2 K Brms CLASS derived baseline rms 43- 46 F4.2 K Mrms ? CLASS derived model rms 48- 52 F5.2 K.km/s Int ? Integrated intensity (4) 54- 56 A3 --- Good [yes no] Was the fit judged to be good?
Note (1): See Table 1 for the locations of the targets. Note (2): Measured in units of the beam (25arcsec). Note (3): The error was similar in all cases with a mean and standard deviation of 8±8m/s. Note (4): Computed using the tdv function in CLASS. See 3.1 for further details.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [KJT2007] Source identification number (1) 5- 6 I2 --- oRA Offset in Right Ascension (2) 8- 9 I2 --- oDE Offset in Declination (2) 11- 15 F5.2 km/s Vel ? CLASS derived centroid velocity (3) 17- 20 F4.2 km/s sigma ? CLASS derived velocity dispersion (FWHM) 22- 24 I3 m/s e_sigma ? Error in DelV 26- 30 F5.2 K Tpeak ? CLASS derived peak intensity (T*A units) 32- 36 F5.2 K.km/s Int ? CLASS derived integrated intensity 38- 41 F4.2 K Brms CLASS derived baseline rms 43- 46 F4.2 K Mrms ? CLASS derived model rms 48- 50 A3 --- Good Was the fit judged to be good?
Note (1): See Table 1 for the locations of the targets. Note (2): Measured in units of the beam (25arcsec). Note (3): The error was similar in all cases with a mean and standard deviation of 16±15m/s.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 12 A12 --- SMMJ Name (HHMMSS+DDMMm), [KJT2007] SMM JHHMMmm+DDMMm in Simbad 14- 15 I2 --- SMM Submillimeter cores identified reference number, [KJT2007] SMM NN in Simbad 17- 18 I2 h RAh Right ascension (J2000.0) 20- 21 I2 min RAm Right ascension (J2000.0) 23- 26 F4.1 s RAs Right ascension (J2000.0) 28 A1 --- DE- Declination sign (J2000.0) 29- 30 I2 deg DEd Declination (J2000.0) 32- 33 I2 arcmin DEm Declination (J2000.0) 35- 38 F4.1 arcsec DEs Declination (J2000.0) 40- 42 F3.1 Jy Sp850 Peak flux at 850um in Jy/beam (2) 44- 48 F5.2 Jy S850 Total flux at 850um (2) 50- 53 F4.1 arcsec Reff Effective radius (2) 55- 58 F4.2 --- Conc Concentration index 60- 61 I2 K TBE BE temperature (3) 63- 66 F4.2 [cm-3] log(n0) Central number density (3) 68- 71 F4.2 cm3/K Pext/k External pressure (3) 73- 75 A3 --- Fit [Yes No] secure fit? (4) 77- 78 I2 --- [JJK2007] ? Associated protostar (5)
Note (2): derived from clfind (Williams et al. 1994, Cat. J/ApJ/428/693). The beam size is 15.7" for the peak flux. Note (3): derived from Bonnor-Ebert (BE) modeling described in section 5 of paper I (2006ApJ...646.1009K) Note (4): See text for description of which submillimeter core identifications are considered to be secure. Note (5): The reference number of any associated Spitzer protostar from the catalog of Jorgensen et al. (2007ApJ...656..293J). Note that if more than one protostar is considered to be associated (within 15"), only the closest one is listed.
History: From electronic version of the journal References: Kirk et al., Paper I 2006ApJ...646.1009K, Cat. J/ApJ/646/1009
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 03-Jan-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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