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J/ApJS/141/157      CO (J=1-0) data of cold IRAS sources     (Yang+, 2002)
A large-scale molecular line survey for cold IRAS sources in the Galaxy.
I. The CO (J=1-0) data.
   Yang J., Jiang Z., Wang M., Ju B., Wang H.
  <Astrophys. J. Suppl. Ser. 141, 157 (2002)>
  =2002ApJS..141..157Y
ADC_Keywords: Radio sources ; Infrared sources ; Radial velocities

Keywords: ISM: jets and outflows - radio lines: ISM - stars: formation


Abstract:
    We conducted a large-scale survey for the cold infrared sources along
    the northern Galactic plane in the CO (J=1-0) line. There are 1912
    IRAS sources selected on the basis of their color indices over the 12,
    25, and 60µm wave bands and their association with regions of
    recent star formation. A quick single-point survey was made toward all
    of the sources, which results in a detection of 1331 sources with
    significant CO emission above the detection limit of 0.7K, inferring
    a CO detection rate of 70%. Located over a wide range of the
    Galactocentric distances, the CO sources show high concentration
    toward the spiral arms. Among the detected sources, there are 351
    sources found to have high-velocity CO wing emission. A search for the
    latest catalog of high-velocity CO flows (HVFs) from young stellar
    objects indicates that 289 sources are beyond the present lists of
    HVFs. These high-velocity wing sources provide us with a comprehensive
    database for the study of HVFs from young stellar objects. Using the
    known outflow sources as an effective indicator, we found that the
    detection rate for high-velocity wings during the quick survey is 62%,
    moderately sensitive in searching for new outflow sources. The CO
    detection rate of the IRAS sources, combined with the ratio of
    high-velocity wing, suggests that 41% of the CO sources are undergoing
    the HVF phase. In this paper, the CO spectra are presented along with
    the preliminary statistics of the data.

Description:
    Observations were made during 1997 April and 2001 May with the 13.7m
    (45 foot) radio telescope at Delingha, the millimeter-wave radio
    observatory of Purple Mountain Observatory, in the J=1-0 line of
    12CO at 115271.204MHz.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat       126     1331   Literature Data for Program Stars
spectra/*          0     1330  *Individual spectra, in eps format

Note on spectra/*: the first spectrum (00017+6342.eps) is missing.
     The corresponding file contained all other spectra in the form 
     of a tar ball.


See also:
   http://jets.pmo.ac.cn/starfm/xcold97.html : XCOLD97 HomePage


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1- 11  A11   ---     IRAS      The IRAS designation
  13- 25  A13   ---     Assoc     The object's major association
  27- 28  I2    h       RAh       Hour of Right Ascension (B1950)
  30- 31  I2    min     RAm       Minute of Right Ascension (B1950)
  33- 36  F4.1  s       RAs       Second of Right Ascension (B1950)
      38  A1    ---     DE-       Sign of the Declination (B1950)
  39- 40  I2    deg     DEd       Degree of Declination (B1950)
  42- 43  I2    arcmin  DEm       Arcminute of Declination (B1950)
  45- 46  I2    arcsec  DEs       Arcsecond of Declination (B1950)
  48- 52  F5.1  deg     GLON      Galactic longitude
  54- 58  F5.1  deg     GLAT      Galactic latitude
  60- 64  F5.2  K       TAp       Peak antenna temperature
  66- 69  F4.2  K       e_TAp     CO spectrum r.m.s noise level
  71- 76  F6.2  km/s    RV        Local standard of rest radial velocity
  78- 82  F5.2  km/s    FWHM      Full width at half maximum of the line (1)
  84- 88  F5.2  km/s    VSpan     ? Line span measured at the 0K level
  90-103  A14   ---     Feature   Notes on line profile features
 105-109  F5.2  kpc     Dist      ? Kinematical distance (2)
 111-126  A16   ---     FileName  Name of the file containing the spectra,
                                   in subdirectory spectra

Note (1): Derived from Gaussian fitting.

Note (2): Derived using the galactic rotation curve, as described in the text.



History:
    From electronic version of the journal
(End)                    Greg Schwarz [AAS], Patricia Bauer [CDS]    17-Sep-2002