J/PASJ/53/1081 CO molecular clouds in Lupus (Tachihara+, 2001)
12CO molecular cloud survey and global star formation in Lupus
Tachihara K., Toyoda S., Onishi T., Mizuno A., Fukui Y., Neuhaeuser R.
<Publ. Astron. Soc. Jap., 53, 1081 (2001)>
=2001PASJ...53.1081T 2001PASJ...53.1081T
ADC_Keywords: Molecular clouds ; Carbon monoxide
Keywords: ISM: clouds - ISM: kinematics and dynamics - ISM: molecules -
ISM: structure - stars: formation
Abstract:
The Lupus star-forming region has been surveyed for molecular clouds
in 12CO with the NANTEN radio telescope, and a cloud mass of
1.7x104M☉ has been revealed. We were able to detect 105
molecular clouds, most of which are relatively small and of low mass.
The members of the Sco OB 2 association and the X-ray detected
pre-main-sequence stars (PMSs) are distributed all around this region.
The OB stars and the molecular clouds show exclusive distributions.
Large fractions of the PMSs are located away from the molecular
clouds, and are thus isolated. The origin of the isolated PMSs is
discussed. About 40% of the PMSs have candidates of their parent
clouds less massive than 20M☉ within 4pc, which suggests in-situ
star formation in the small clouds and their rapid dissipation. The
separations from the PMSs to the clouds are typically larger than
those in the Chamaeleon region, probably because of coexisting OB
stars. From the cloud structures and the distributions of the OB
stars, PMSs, and H I expanding shell, it is suggested that the
molecular clouds have been effectively dissipated by the OB stars and
a shock wave, which may also have triggered star formation in Lupus
and the ρ Oph clouds.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 78 113 Observed properties of the clouds
table2.dat 38 105 Physical properties of the clouds
--------------------------------------------------------------------------------
See also:
J/PASJ/53/971 : CO catalog of LMC molecular clouds (Mizuno+, 2001)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- [TTO2001] Sequential number
5- 16 A12 --- Name Cloud name (lll.ll+bb.bb)
17 A1 --- n_Name [a-d] Previously identified clouds (1)
19- 25 F7.3 deg GLON Galactic longitude (2)
27- 32 F6.3 deg GLAT Galactic latitude (2)
34- 35 I2 h RAh Right ascension (1950) (2)
37- 38 I2 min RAm Right ascension (1950) (2)
40- 43 F4.1 s RAs Right ascension (1950) (2)
45 A1 --- DE- Declination sign (1950) (2)
46- 47 I2 deg DEd Declination (1950) (2)
49- 50 I2 arcmin DEm Declination (1950) (2)
52- 55 F4.1 arcsec DEs Declination (1950) (2)
57- 61 F5.2 K TR* 12CO Absolute peak antenna temperature (3)
63- 66 F4.2 km/s FWHM 12CO FWHM line-width (3)
68- 72 F5.2 km/s Vlsr 12CO centre velocity with respect to LSR (3)
74- 78 F5.2 K.km/s W(CO) 12CO integrated intensities at the peak
positions of the CO clouds (3)
--------------------------------------------------------------------------------
Note (1): These clouds correspond to previously identified clouds as follows:
a = Lupus 1
b = Lupus 2
c = Lupus 9
d = This cloud consists of the known clouds of Lupus 3, 4, 5, and 6.
Note (2): Position of the 12CO peak integrated intensity of the cloud
Note (3): If the 12CO emission at the peak intensity position shows
apparent multi-velocity components, the parameters are given
for each component. The peak intensity position of the cloud
is defined by a Gaussian fitting.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- [TTO2001] Sequential name
5- 16 A12 --- Name Cloud name (lll.ll+bb.bb)
18- 21 F4.1 10+20cm-2 N(H2) H2 column density
23- 28 F6.1 solMass Mass Mass
30- 33 F4.2 pc Rad Radius
35- 38 F4.1 10+2cm-3 n(H2) Average number density
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 18-Feb-2002