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VIII/66   IRAM observations in pre-star forming regions   (Falgarone+ 1998-2001)

IRAM key-project ``Small-scale structure of pre-star forming regions'' I. Observational results Falgarone E., Panis J.-F., Heithausen A., Perault M., Stutzki J., Puget J.-L., Bensch F. <Astron. Astrophys. 331, 669 (1998)> =1998A&A...331..669F III. Influence of and correction for the error beam pick-up Bensch F., Panis J.-F., Stutzki J., Heithausen A., Falgarone E. <Astron. Astrophys. 365, 275 (2001)> =2001A&A...365..275B
ADC_Keywords: Radio lines ; Carbon monoxide Keywords: turbulence - methods: data analysis - techniques: miscellaneous - radio lines: ISM - line: profiles - ISM: kinematics and dynamics - ISM: clouds - ISM: molecules Description: The goal of the IRAM key-project ``Small-scale structure of pre-star forming regions'' is to map three nearby (d∼150pc), quiescent molecular clouds with a high angular and spectral resolution to study the molecular cloud structure down to the smallest linear scales currently accessible by single dish radio telescopes. The key-project maps are available as data cubes (velocity, right ascension or galactic longitude, declination or galactic latitude) available as a set of 40 FITS files stored in the fits subdirectory; a summary of these 40 files is contained in the file "list.dat". The observations reported concern the molecular clouds L1512, L134A, and MCLD 123.5+24.9 in the Polaris Flare. The released data set of the IRAM key-project (Falgarone et al., 1998A&A...331..669F) are error beam corrected using the beam pattern parameters published by Garcia-Burillo, Guelin and Cernicharo (1993A&A...274..123G) and observations made with the KOSMA 3m telescope. Bensch et al. (2001A&A...365..275B) present the corrected maps using the 30m beam pattern recently published by Greve et al. (1998A&AS..133..271G). They estimate the accuracy of the maps of the key-project as 10-15% for the CO(2-1), except for two 13CO(2-1) maps of the MCLD 123.5+24.9/Polaris Flare and of L1512 where the uncertainties are estimated to 22% and 18% respectively. For the CO(1-0) data, the overall accuracy is 11%. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 172 40 List of data fits/* 0 40 FITS files (IRAM & KOSMA)
Common properties of the data cubes stored in the 'fits' subdirectory: * Data is in fits format. * Orientation of the data cube is (1) velocity [m/s], (2) spatial coord 1, (3) spatial coord 2; For Polaris Flare/MCLD 123.5+24.9 the spatial coordinates are galactic longitude/latitude; for L1512 and L134A the spatial coordinates are RA/Dec (J1950) Properties of IRAM data (datafiles with a digit in the second byte): * the intensities are in units of Tmb,c (corrected main beam brightness temperature scale; Bensch, F., Heithausen, A., Stutzki, J., in prep.) * the effective velocity resolution is 85m/s for the CO(1-0) data and 43m/s for the CO(2-1) data * the sampling is 7"5x7"5 for all maps (square grid) * the angular resolution is 22arcmin for the CO(1-0) data and 13.5arcmin for the CO(2-1) data The digit in the second byte takes the values: 1 : the released data set of the IRAM key-project (Paper I) 3 : the data set presented in paper III. Properties of KOSMA observations (datafiles with 'k' in the second byte): (used to correct for the error beam pick-up in the IRAM key-project data) * the intensities are in units of TA* (antenna temperature), EXCEPT for the 12CO(1-0) observations of the Polaris Flare/MCLD 123.5+24.9, which is in Tmb (main beam brightness temperature). The latter map is published by Grossmann et al., 1990A&A...240..400G. * For the KOSMA CO(2-1) observations, a main beam efficiency of Beff=0.62 and Feff=0.91 was applied (Beff, Feff follow the definition by Downes, A., 1989, "Introductory courses in Galaxies", Springer Verlag, Lecture Notes in Physics 333, 351). * The main beam HPBW of the telescope is: 234arcsec (for the observations at 115 GHz) 132arcsec (observations at 220/230 GHz) This information (temperature scale, efficiency, HPBW) also appears in the header of the FITS files. Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
1- 12 A12 --- FITSfile FITS cube filename, in "fits" subdirectory (1) 14- 25 A12 --- Obs Observatory name 27- 40 A14 --- Name Source name 42- 50 A9 --- Line Line designation 52- 62 F11.4 MHz Freq Central frequency 64- 70 F7.4 MHz Step Frequency step 72- 74 I3 --- Nv Number of velocity points 75 A1 --- --- [x] 76- 78 I3 --- N1 Number of RA (or longitude) points 79 A1 --- --- [x] 80- 82 I3 --- N2 Number of Dec (or latitude) points 84- 91 F8.1 m/s Vmin Minimal velocity 93- 99 F7.1 m/s Vmax Maximal velocity 101-105 F5.1 m/s Vstep Velocity resolution 107 A1 --- Orient [RG] Orientation along RA/DE (R) or Galactic (G) 109-116 F8.4 deg Amin RA or GLON minimum 118-125 F8.4 deg Amax RA or GLON maximum 127-131 F5.1 arcsec Astep RA or GLON step 133-140 F8.4 deg Dmin DE or GLAT minimum 142-149 F8.4 deg Dmax DE or GLAT maximum 151-155 F5.1 arcsec Dstep DE or GLAT step 157-164 F8.4 deg Amed Median RA or GLON 165-172 F8.4 deg Dmed Median DE or GLAT
Note (1): The names of the FITS files use the following conventions: - the first character is 'a' for L134A, 'b' for L1512, and 'p' for the Polaris flare/MCLD 123.5+24.9 - the second character is '1' for the released data set of the IRAM key-project (paper I) '3' for the IRAM data set presented in Paper III 'k' for the KOSMA data
Acknowledgements: Frank Bensch
(End) Patricia Bauer [CDS] 26-Sep-2000
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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