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J/ApJ/315/104       Molecular clouds near Gould belt         (Taylor+, 1987)

Molecular clouds and the Gould belt. Taylor D.K., Dickman R.L., Scoville N.Z. <Astrophys. J. 315, 104 (1987)> =1987ApJ...315..104T (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Radial velocities Keywords: galaxies: Milky Way - galaxies: structure - interstellar: molecules Abstract: We investigate the relationship of the local system of molecular clouds to the Gould belt. A careful examination of the National Geographic-Palomar Observatory Sky Survey Atlas (POSS) yielded a catalog of dark clouds with accurately measured positions as far south as δ=-27°. From a nonlinear least squares fit to these data, along with positions from Feitzinger and Stuwe's catalog of southern clouds, we find a subset of dark clouds to be distributed irregularly along a curve b=-3.5° + 12.5°sin(l-27.5°) This is similar to the distribution of the system of O and B stars used to define the system. Radial velocities in the J=1->0 transition of carbon monoxide were measured for all dark clouds in our catalog using the 14 m antenna of the Five College Radio Astronomy Observatory. The velocity distribution of those clouds judged to be members of the belt population suggests an expansion similar to that seen in the neutral atomic hydrogen and OB stars. Similar expansion energies are found for both gas constituents, atomic and molecular, as well as for the Gould belt stars. The velocity-longitude data for our molecular clouds were fitted to a model ring expanding under the influence of Galactic differential rotation and interstellar drag, with poor results. We discuss the reasons for this. Because the similar expansion energies of the stellar, H I, and molecular gas constituents of the Gould belt are all approximately equal, we suggest that the belt originated in an acceleration of gas rather than in a violent impulse such as a blast wave from one or more supernovae. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 56 662 Catalog of dark clouds
See also: VII/7 : Lynds' Catalogue of Dark Nebulae (LDN) (Lynds 1962) VII/191 : Catalogue of Southern Dark Clouds (Hartley+ 1986) J/ApJS/95/457 : IRAS images of nearby dark clouds (Wood+ 1994) J/A+AS/141/175 : Dark clouds imaging polarimetry (Sen+, 2000) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- TDS Sequential number 6- 11 F6.2 deg GLON Galactic longitude 13- 18 F6.2 deg GLAT Galactic latitude 20- 21 I2 h RAh Right ascension (1950) 23- 24 I2 min RAm Right ascension (1950) 26- 27 I2 s RAs Right ascension (1950) 29 A1 --- DE- Declination sign (1950) 30- 31 I2 deg DEd Declination (1950) 33- 34 I2 arcmin DEm Declination (1950) 36- 37 I2 arcsec DEs Declination (1950) 39- 43 F5.1 km/s RV Spectral line centroid radial velocity 44 A1 --- n_RV [*] *: the observed velocity implies a nonlocal cloud 46- 50 A5 --- Belt Belt (Gal or Gould) 53- 56 I4 --- LDN ? Lynds (Cat. VII/7) number
History: Prepared via OCR at CDS.
(End) Marie-Jose Wagner, Patricia Bauer [CDS] 06-Apr-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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