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J/A+AS/111/95 Studies of dense molecular cores (Zinchenko+, 1995)
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Studies of dense molecular cores in regions of massive star formation
II. CSJ=2-1 survey of southern H_2_O masers in the longitude range
l=260deg-310deg.
Zinchenko I., Mattila K., Toriseva M.
<Astron. Astrophys. Suppl. Ser. 111, 95 (1995)>
=1995A&AS..111...95Z (SIMBAD/NED Reference)
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Keywords: masers - stars: formation - ISM: clouds - ISM: molecules -
radio lines: interstellar
Abstract:
We searched for the CS J=2-1 emission towards 30 southern H_2O and OH masers
with the SEST radio telescope (29 H_2O and H_2O/OH masers and 1 OH maser).
We detected and mapped 24 CS emitting regions associated probably with 27
H_2O masers. The C^34^S J=2-1 and CO J=1-0 lines were also observed at the
grid positions closest to the CS peaks. Here we present the CS maps and the
spectra at the peak positions along with the CO and C^34^S spectra.
We derive the C^34^S column densities in the LTE approximation and discuss
briefly the spatial and kinematic structure of the sources. The
association with the IRAS point sources and small scale structure sources is
examined. We estimate the kinematic distances to the cores and derive
their sizes, masses and mean densities. The velocity differences between
the masers and CS cores are analyzed. The CO and CS spectra towards
several sources demonstrate deep absorption features. We argue that
they can be due to extended low excitation foreground cloud(s).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 110 30 Sources
table2 105 41 Line areas and gaussian line parameters
table3 79 34 Sources associated
table4 39 24 Column densities, sizes, mean densities, masses
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See also:
J/A+A/288/601 : Dense molecular cores. I. (Zinchenko+ 1994)
J/A+AS/118/191 : Dense molecular cores. IV. (Juvela 1996)
J/A+AS/124/385 : Dense molecular cores. V. (Zinchenko+ 1997)
J/A+AS/133/337 : Dense molecular cores. VII. (Zinchenko+ 1998)
Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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2- 14 A13 --- Name Name of the source
17- 18 I2 h RAh Right ascension (1950)
20- 21 I2 min RAm Right ascension (1950)
23- 26 F4.1 s RAs Right ascension (1950)
28 A1 --- DE- Declination sign
29- 30 I2 deg DEd Declination (1950)
32- 33 I2 arcmin DEm Declination (1950)
35- 36 I2 arcsec DEs Declination (1950)
38- 39 I2 arcmin DTheta []? Uncertainty on coordinates
41- 44 F4.1 kpc R []? Galacto-centric distance
48- 50 I3 pc Z1 []? Lowest value of height above the
galactic plane when n_Z='/'
51 A1 --- n_Z [/] '/' indicates an interval of Z
52- 55 I4 pc Z []? Z or higher value of Z when n_Z='/'
59- 61 F3.1 kpc Dist1 []? Lowest value of kinematic distances when
n_Dist='/'
62 A1 --- n_Dist [/] '/' indicates an interval of Dist
63- 66 F4.1 kpc Dist []? Kinematic distance or the highest value
of kinematic distance when n_Dist='/'
69- 71 F3.1 kpc Dstar1 []? Spectrophotometric distance of the
exciting star (first detection)
73 A1 --- r_Dstar1 [abc] Reference for Dstar1 (1)
77- 79 F3.1 kpc Dstar2 []? Spectrophotometric distance of the
exciting star (second detection)
81 A1 --- r_Dstar2 [abc] Reference for Dstar2 (1)
85- 87 F3.1 kpc Dstar3 []? Spectrophotometric distance of the
exciting star (third detection)
89 A1 --- r_Dstar3 [abc] Reference for Dstar3 (1)
95- 97 I3 km/s VH2Oinf []? Lowest value of radial velocity of the
maser when n_VH2O=','
98 A1 --- n_VH2O ',' indicates an interval of values
99-102 I4 km/s VH2O Radial velocity of the maser or highest value
of VH2O when n_VH2O=','
104-110 A7 --- Rem Remarks
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Note (1): a) Brand J. & Blitz L., 1993, A&A 275, 67
b) Avedisova V.S. & Palous J., 1989,
Bull. Astron. Inst. Czechosl. 40, 42
c) Georgelin Y.M. & Geogerlin Y.P., 1976, A&A 49, 57.
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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2- 14 A13 --- Source Name of the source
16- 18 A3 min Dalpha Delta right ascension
20- 22 A3 arcmin DDE Delta declination
24- 27 F4.1 K.km/s Int(Tmb)1 []? Integral of the main beam brightness
temperature in dv (Line areas) (CS)
29 I1 0.1K.km/s e_Int(Tmb)1 []? Statistical uncertainties on Line
areas (CS)
31- 35 F5.2 K Tmb1 Main beam brightness temperature (CS)
37- 38 I2 0.01K e_Tmb1 Statistical uncertainties on main beam
brightness temperature (CS)
41- 46 F6.2 km/s Vel1 LSR velocity (CS)
48- 49 I2 0.01km/s e_Vel1 Statistical uncertainties on velocity (CS)
51- 55 F5.2 km/s DVel1 Delta velocity (CS)
57- 58 I2 0.01km/s e_DVel1 Statistical uncertainties (CS)
61- 64 F4.2 K.km/s Int(Tmb)2 []? Integral of the main beam brightness
temperature in dv (Line areas)(C^34^S)
66- 67 I2 0.01K.km/s e_Int(Tmb)2 []? Statistical uncertainties on Line
areas (C^34^S)
69- 73 F5.2 K Tmb2 []? Main beam brightness temperature
(C^34^S)
75- 76 I2 0.01K e_Tmb2 []? Statistical uncertainties on main beam
brightness temperature (C^34^S)
79- 84 F6.2 km/s Vel2 []? Velocity (C^34^S)
86- 87 I2 0.01km/s e_Vel2 []? Statistical uncertainties on velocity
(C^34^S)
90- 92 F3.1 km/s DVel2 []? Delta velocity (C^34^S)
94- 95 I2 0.1km/s e_DVel2 []? Statistical uncertainties (C^34^S)
101-102 I2 K Tmb3 []? Main beam brightness temperature (CO)
103-105 A3 --- n_Tmb3 Label on the main beam brightness
temperature (CO) that indicates position
(0,0)
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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2- 15 A14 --- Name Source name
16- 25 A10 --- IRAS IRAS name
27- 30 F4.1 s RAs []? Right ascension (seconds)
33- 34 I2 arcmin DEm []? Declination (arcmin)
37- 38 I2 arcsec DEs []? Declination (arcsec)
40- 45 A6 Jy F12 Flux at 12um for IRAS point sources
47 A1 --- q_F12 Flux quality flags for F12 (1)
49- 55 A7 Jy F25 Flux at 25um for IRAS point sources
57 A1 --- q_F25 Flux quality flags for F25 (1)
59- 66 A8 Jy F60 Flux at 60um for IRAS point sources
68 A1 --- q_F60 Flux quality flags for F60 (1)
70- 77 A8 Jy F100 Flux at 100um for IRAS point sources
79 A1 --- q_F100 Flux quality flags for F100 (1)
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Note (1): The flux quality flags are shown following the notation in the IRAS
point source and small scale structure catalogues
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Byte-by-byte Description of file: table4
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Bytes Format Units Label Explanations
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2- 14 A13 --- Source Source name
16- 20 F5.2 cm-2 logNl Column density of the core (C34S)
22- 23 I2 0.01cm-2 e_logNl Rms uncertainty on column density
26- 28 F3.1 pc L []? Size of the core
30- 33 F4.2 cm-3 logn []? Mean density of the core
35- 39 I5 solMass M []? Mass of the core
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References:
Zinchenko, Paper III 1995A&A...303..554Z
Lapinov et al., Paper VI 1998A&A...336.1007L
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(End) Patricia Bauer [CDS] 02-Mar-1995