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J/A+AS/118/191      Multitransition CS-study towards H2O masers (Juvela, 1996)

Studies of dense molecular cores in regions of massive star formation. IV. Multitransition CS-study towards southern H2O masers in the longitude range l=308-360deg Juvela M. <Astron. Astrophys. Suppl. Ser. 118, 191 (1996)> =1996A&AS..118..191J (SIMBAD/NED BibCode)
ADC_Keywords: Masers ; Radio lines ; Radial velocities Keywords: masers - stars: formation - ISM: clouds - ISM: molecules - radio lines: ISM Abstract: We have observed CS and C34S emission towards 33 H2O maser positions in the southern sky (δ←28deg) using the SEST telescope. Most of the sources were selected also for their association with strong IRAS sources. CS(2-1) was detected in all sources, with the possible exception of two. Most sources were also mapped in the transitions CS(5-4) and C34S(2-1) and half of the sample also in CS(2-1). CS and C34S transitions J=2-1, J=3-2 J=5-4 were measured towards the centres of the clouds as determined from the mapping. CS and C34S transitions J=7-6 were measured in about a half dozen clouds. CO(1-0) was measured in most clouds in order to determine the kinetic temperatures. The CS column densities were calculated using the LTE approximation. All measurements were also analyzed using a spherical LVG model. We present the observational data and the results of this analysis. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2 120 33 The source list table3 130 132 CS and C34S lines area and Gaussian line parameters for the central positions of the sources table5 63 116 Results for the LTE analysis of the CS observations table6 43 28 The densities and cloud masses calculated in LTE approximation from the lines C34S(2-1) and CS(2-1) table7 45 33 Results from the LVG analysis
See also: J/A+A/288/601 : Dense molecular cores. I. (Zinchenko+ 1994) J/A+AS/111/95 : Dense molecular cores. II. (Zinchenko+, 1995) 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: table2
Bytes Format Units Label Explanations
2- 15 A14 --- Name Source name 17- 32 A16 --- names Other names 34- 35 I2 h RAh Right ascension 1950 37- 38 I2 min RAm Right ascension 1950 40- 43 F4.1 s RAs Right ascension 1950 45 A1 --- DE- Declination sign 46- 47 I2 deg DEd Declination 1950 49- 50 I2 arcmin DEm Declination 1950 52- 55 F4.1 arcsec DEs Declination 1950 57- 59 I3 km/s RV Radial velocity of the H2O maser 60 A1 --- n_RV [+] A '+' indicates velocity of an OH maser 62- 65 F4.2 kpc DistG ? Galacto-centric distance 68- 71 F4.2 kpc Dist1 ? Kinematic distance from CS data 72 A1 --- u_Dist1 [)] Uncertainty flag on Dist1 75- 79 F5.2 kpc Dist2 ? Kinematic distance from C34S data 80 A1 --- u_Dist2 [)] Uncertainty flag on Dist2 84- 86 I3 pc z1 ? Height above the galactic plane from CS data 87 A1 --- u_z1 [)] Uncertainty flag on z1 90- 93 I4 pc z2 ? Height above the galactic plane from C34S data 94 A1 --- u_z2 [)] Uncertainty flag on z2 96- 99 F4.1 kpc DistRef ? Distance estimates from the literature 101 A1 --- r_DistRef Distance references (1) 103-112 A10 --- Ref Maser references (2)
Note (1): Distance references: 1. Caswell J.L. & Haynes R.F. 1987, A&A, 171, 261 =1987A&A...171..261C 2. Henning T. et al. 1990, A&A, 227, 542 =1990A&A...227..542H 3. Lockman F. 1979,ApJ, 232, 761 =1979ApJ...232..761L 4. Moorwood A.F.M. et al. 1983, A&A, 125, 342 =1983A&A...125..342M 5. Neckel T. et al. 1978, A&A, 69, 51 =1978A&A....69...51N 6. Simpson J.P. et al. 1990, ApJ, 354, 165 =1990ApJ...354..165S 7. Testi L. et al. 1994, A&A, 288, 634 =1994A&A...288..634T 8. Zavagno A. et al. 1992, A&A, 259, 241 =1992A&A...259..241Z Note (2): Maser references: a. Batchelor R.A. et al. 1980, Aust. J. Phys., 33, 139 =1980AuJPh..33..139B b. Braz M.A. & Scalise E. Jr. 1982, A&A, 107, 272 =1982A&A...107..272B c. Braz M.A. et al. 1989, A&AS, 77, 465 =1989A&AS...77..465B d. Caswell J.L. et al. 1983, Aust. J. Phys., 36, 401 =1983AuJPh..36..361C e. Forster J.R. & Caswell J.L. 1989, A&A, 213, 339 =1989A&A...213..339F f. Guesten R. & Downes D. 1983, A&A, 117, 343 =1983A&A...117..343G g. Kaufmann P. et al. 1977, AJ, 82, 577 =1977AJ.....82..577K h. Moran J.M. & Rodriguez L.F. 1980, ApJ, 236, L159 =1980ApJ...236L.159M i. Scalise E. Jr. & Braz M.A. 1980, A&A, 85, 149 =1980A&A....85..149S
Byte-by-byte Description of file: table3
Bytes Format Units Label Explanations
1- 12 A12 --- Name Source name 14- 22 A9 --- Pos Offsets of the observed position relative to the positions given in table2 23 I1 --- J J values for the upper level of each transition 25- 29 F5.2 K.km/s IntTmb1 ? Integrated line temperature (from C34S data) 31- 34 F4.2 K.km/s e_IntTmb1 ? rms uncertainty on IntTmb1 37- 40 F4.2 K Tmb1 ? Line temperature (from C34S data) 42- 45 F4.2 K e_Tmb1 ? rms uncertainty on Tmb1 48- 53 F6.2 km/s RV1 ? Radial velocity (from C34S data) 55- 58 F4.2 km/s e_RV1 ? rms uncertainty on RV1 61- 64 F4.2 km/s DV1 ? Observed line width (from C34S data) 66- 69 F4.2 km/s e_DV1 ? rms uncertainty on DV1 72 A1 --- wing1 [bra] Note on the spectra (1) 74- 79 F6.2 K.km/s IntTmb2 ? Integrated line temperature (from CS data) 81- 84 F4.2 K.km/s e_IntTmb2 ? rms uncertainty on IntTmb2 87- 91 F5.2 K Tmb2 ? Line temperature (from CS data) 93- 96 F4.2 K e_Tmb2 ? rms uncertainty on Tmb2 99-104 F6.2 km/s RV2 ? Radial velocity (from CS data) 106-109 F4.2 km/s e_RV2 ? rms uncertainty on RV2 112-116 F5.2 km/s DV2 ? Observed line width (from CS data) 118-121 F4.2 km/s e_DV2 ? rms uncertainty on DV2 124-125 A2 --- wing2 [bra ] Note on the spectra (1) 127-128 A2 --- wing3 [bra ] Note on the spectra (1)
Note (1): b: blue wing, r: red wing, a: strong absorption
Byte-by-byte Description of file: table5
Bytes Format Units Label Explanations
1- 11 A11 --- Name Source name 13 I1 --- J J values for the upper level of each transition 17- 20 F4.1 K Tex ? Excitation temperature 22- 24 F3.1 K e_Tex ? rms uncertainty on Tex 29- 32 F4.2 --- taup ? Optical depth from C^34^S data (classical method) (1) 34- 37 F4.2 --- e_taup ? rms uncertainty on taup 42- 45 F4.2 --- taua ? Optical depth from C^34^S data (second method) (2) 47- 50 F4.2 --- e_taua ? rms uncertainty on taua 53- 57 F5.2 [cm-2] log(N) ? Column density calculated from the line integrals (C34S data) 59- 62 F4.2 [cm-2] e_log(N) ? rms uncertainty on log(N)
Note (1): The optical depth taup was obtained in the usual manner from the ratio of the peak main beam temperatures assuming identical excitation temperatures and beam filling factors for both isotopes. Note (2): If one takes into account the line broadening due to the optical depth (Phillips et al., =1979ApJ...231..720P), the observed line width, DV, can be expressed in terms of the line width of the optically thin line, DV0, as DV=(DV0/sqrt(ln2)).sqr(ln(tau/ln[2/1+exp(-tau)])). This expression can be used to derive the optical depth from the ratio of the line area for the two isotopes. This value of the optical depth is denoted taua.
Byte-by-byte Description of file: table6
Bytes Format Units Label Explanations
1- 12 A12 --- Name Source name 15- 18 F4.1 kpc Dist Distance 20- 24 F5.2 arcsec Size Size 27- 29 F3.1 [cm-3] log(n) Density 32- 36 I5 solMass Mass Cloud mass 39- 43 I5 solMass Mvir Virial mass of the core
Byte-by-byte Description of file: table7
Bytes Format Units Label Explanations
1- 11 A11 --- Name Source name 15- 16 I2 K Tkin ? Kinetic temperature 17 A1 --- u_Tkin [?] Uncertainty flag on Tkin 19 A1 --- l_log(n1) Limit flag on log(n1) 20- 22 F3.1 [cm-3] log(n1) ? Total gas density derived from CS data 24 I1 0.1[cm-3] e_log(n1) ? rms uncertainty on log(n1) 27- 30 F4.1 [cm-2] log(N1) ? 32CS column density (from CS data) 32- 34 F3.1 [cm-3] log(n2) ? Total gas density derived from C34S data 36 I1 0.1[cm-3] e_log(n2) ? rms uncertainty on log(n2) 39- 42 F4.1 [cm-2] log(N2) ? 32CS column density (from C34S data) 44 I1 0.1[cm-2] e_log(N2) ? rms uncertainty on log(N2)
References: Zinchenko I., Paper III 1995A&A...303..554Z Lapinov et al., Paper VI 1998A&A...336.1007L
(End) Patricia Bauer [CDS] 04-Apr-1996
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