J/A+AS/111/95 J/A+AS/111/95 Studies of dense molecular cores I Zinchenko K Mattila M Toriseva Astron. Astrophys. Suppl. Ser. 111 95 1995 1995A&AS..111...95Z ISM: clouds ISM: molecules masers radio lines: ISM stars: formation 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).

Name Name of the source --- RAh Right ascension (1950) h RAm Right ascension (1950) min RAs Right ascension (1950) s DE- Declination sign --- DEd Declination (1950) deg DEm Declination (1950) arcmin DEs Declination (1950) arcsec DTheta Uncertainty on coordinates arcmin R Galacto-centric distance kpc Z1 Lowest value of height above the galactic plane when n_Z='/' pc n_Z '/' indicates an interval of Z --- Z Z or higher value of Z when n_Z='/' pc Dist1 Lowest value of kinematic distances when n_Dist='/' kpc n_Dist '/' indicates an interval of Dist --- Dist Kinematic distance or the highest value of kinematic distance when n_Dist='/' kpc Dstar1 Spectrophotometric distance of the exciting star (first detection) kpc r_Dstar1 Reference for Dstar1 number=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. --- Dstar2 Spectrophotometric distance of the exciting star (second detection) kpc r_Dstar2 Reference for Dstar2 number=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. --- Dstar3 Spectrophotometric distance of the exciting star (third detection) kpc r_Dstar3 Reference for Dstar3 number=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. --- VH2Oinf Lowest value of radial velocity of the maser when n_VH2O=',' km/s n_VH2O ',' indicates an interval of values --- VH2O Radial velocity of the maser or highest value of VH2O when n_VH2O=',' km/s Rem Remarks --- Source Name of the source --- Dalpha Delta right ascension min DDE Delta declination arcmin Int(Tmb)1 Integral of the main beam brightness temperature in dv (Line areas) (CS) K.km/s e_Int(Tmb)1 Statistical uncertainties on Line areas (CS) 0.1K.km/s Tmb1 Main beam brightness temperature (CS) K e_Tmb1 Statistical uncertainties on main beam brightness temperature (CS) 0.01K Vel1 LSR velocity (CS) km/s e_Vel1 Statistical uncertainties on velocity (CS) 0.01km/s DVel1 Delta velocity (CS) km/s e_DVel1 Statistical uncertainties (CS) 0.01km/s Int(Tmb)2 Integral of the main beam brightness temperature in dv (Line areas)(C^34^S) K.km/s e_Int(Tmb)2 Statistical uncertainties on Line areas (C^34^S) 0.01K.km/s Tmb2 Main beam brightness temperature (C^34^S) K e_Tmb2 Statistical uncertainties on main beam brightness temperature (C^34^S) 0.01K Vel2 Velocity (C^34^S) km/s e_Vel2 Statistical uncertainties on velocity (C^34^S) 0.01km/s DVel2 Delta velocity (C^34^S) km/s e_DVel2 Statistical uncertainties (C^34^S) 0.1km/s Tmb3 Main beam brightness temperature (CO) K n_Tmb3 Label on the main beam brightness temperature (CO) that indicates position (0,0) --- Name Source name --- IRAS IRAS name --- RAs Right ascension (seconds) s DEm Declination (arcmin) arcmin DEs Declination (arcsec) arcsec F12 Flux at 12um for IRAS point sources Jy q_F12 Flux quality flags for F12 number=1 The flux quality flags are shown following the notation in the IRAS point source and small scale structure catalogues --- F25 Flux at 25um for IRAS point sources Jy q_F25 Flux quality flags for F25 number=1 The flux quality flags are shown following the notation in the IRAS point source and small scale structure catalogues --- F60 Flux at 60um for IRAS point sources Jy q_F60 Flux quality flags for F60 number=1 The flux quality flags are shown following the notation in the IRAS point source and small scale structure catalogues --- F100 Flux at 100um for IRAS point sources Jy q_F100 Flux quality flags for F100 number=1 The flux quality flags are shown following the notation in the IRAS point source and small scale structure catalogues --- Source Source name --- logNl Column density of the core (C34S) cm-2 e_logNl Rms uncertainty on column density 0.01cm-2 L Size of the core pc logn Mean density of the core cm-3 M Mass of the core solMass Patricia Bauer CDS 1995Mar02 J_A+AS_111_95.xml