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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 126 1331 Literature Data for Program Stars
spectra/* . 1330 *Individual spectra, in eps format
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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.
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See also:
http://jets.pmo.ac.cn/starfm/xcold97.html : XCOLD97 HomePage
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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
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Note (1): Derived from Gaussian fitting.
Note (2): Derived using the galactic rotation curve, as described in the text.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 17-Sep-2002