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J/A+AS/124/385      Dense molecular cores. V. (Zinchenko+ 1997)

Studies of dense molecular cores in regions of massive star formation. V. Structure and kinematics of dense cores from ammonia observations Zinchenko I., Henning T., Schreyer K. <Astron. Astrophys. Suppl. Ser. 124, 385 (1997)> =1997A&AS..124..385Z (SIMBAD/NED BibCode)
ADC_Keywords: Masers ; Radio lines ; Radial velocities Keywords: stars: formation - ISM: clouds - ISM: molecules - radio lines: interstellar Abstract: We present results of the observations of 17 molecular clouds associated with bright FIR sources in the NH3 (1, 1) and (2, 2) lines with the 100-m radio telescope in Effelsberg. The lines were detected in 11 clouds and 10 of them have been mapped in these lines. The kinetic temperatures, sizes, masses and mean densities of the ammonia cores have been derived. For most of the detected clouds the masses derived under the assumption of a relative ammonia abundance of χ(NH3)=3x10-8 are close to virial masses. However, in S 88 B the ratio M/Mvir is only ∼0.1 and in a few other cases this ratio is significantly lower than unity which may indicate ammonia underabundance. Almost all objects with the signs of underabundance are among the most luminous IR sources in our sample. Most of the mapped cores are elongated with noticeable velocity gradients along the major axis. The most prominent example is S 255. S 87 has a two-component structure with 2 distinct velocity components which overlap partly spatially. In about half of the mapped sources the NH3 line widths increase near the peaks of the ammonia emission. The kinetic temperatures are centrally peaked. They reach 20-28K in the centre and drop to 15-20K at the edges of the ammonia emitting regions. In S 76 E a weak extended emission in the (1, 1) line at the velocity blue-shifted by ∼5km/s relative to the core emission was detected. Hyperfine intensity anomalies in the (1, 1) transition were found in S 199 in addition to the known case of these anomalies in S 87. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 85 17 Source list table5 69 20 NH3 mapping data for S76E table6 69 15 NH3 mapping data for S86 table7 75 42 NH3 mapping data for S87 table8 72 15 NH3 mapping data for S88B table9 69 10 NH3 mapping data for S145 table10 72 22 NH3 mapping data for S199 table11 72 25 NH3 mapping data for S231 table12 72 29 NH3 mapping data for S255 table13 72 32 NH3 mapping data for RNO1B table14 75 15 NH3 mapping data for BFS48
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/118/191 : Dense molecular cores. IV. (Juvela, 1996) J/A+AS/133/337 : Dense molecular cores. VII. (Zinchenko+ 1998) J/ApJS/125/161 : A database of dense cores mapped in ammonia (Jijina+, 1999) Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
1- 6 A6 --- Name Source name 8- 9 I2 h RAh Right ascension (1950) 11- 12 I2 min RAm Right ascension (1950) 14- 17 F4.1 s RAs Right ascension (1950) 19- 20 I2 deg DEd Declination (1950) 22- 23 I2 arcmin DEm Declination (1950) 25- 26 I2 arcsec DEs Declination (1950) 28- 33 F6.2 deg GLON Galactic longitude 35- 39 F5.2 deg GLAT Galactic latitude 41- 44 F4.1 kpc RG Galacto-centric distance of the source 46- 49 F4.2 kpc Dist Distance from the Earth 50 A1 --- r_Dist Distance reference (1) 52- 54 I3 pc z Height above the Galactic plane 56- 65 A10 --- IRAS IRAS PSC (Cat. II/125) name 66 A1 --- m_IRAS Multiplicity index on IRAS 68- 73 E6.1 solLum L(IR) IRAS luminosity 75 A1 --- Detec [oh] Source detection (2) 77- 85 A9 --- Rem Remark
Note (1): a: Brand & Blitz (1993, Cat. J/A+A/275/67)) b: Plume et al. (1992ApJS...78..505P) c: Blitz et al. (1982ApJS...49..183B, Cat. VII/50) d: Henning et al. (1992A&AS...93..525H) e: Avedisova & Palous (1989BAICz..40...42A) f: Yang et al. (1991ApJ...373..137Y) g: Fich & Blitz (1984ApJ...279..125F) i: assumed Note (2): h: Outflow detected as given by Mattila et al. (1996, in prep.) o: Outflow detected as given by Wu et al. (1976, Cat. J/A+AS/115/283)
Byte-by-byte Description of file: table*
Bytes Format Units Label Explanations
3- 6 I4 arcsec Dalpha Offset in R.A. (multiplied by cosδ) 9- 12 I4 arcsec Ddelta Offset in Dec. 15 I1 --- N Velocity component 18- 23 F6.2 km/s Vlsr ? LSR velocity 26- 29 F4.2 km/s e_Vlsr ? rms uncertainty on Vlsr 33- 37 F5.2 km/s DeltaV ? Line width 40- 43 F4.2 km/s e_DeltaV ? rms uncertainty on DeltaV 46 A1 --- l_logNH3 limit flag on logNH3 47- 51 F5.2 [cm-2] logNH3 Ammonia NH_3(1,1) column density 54- 57 F4.2 [cm-2] e_logNH3 ? rms uncertainty on logNH3 60- 63 F4.1 K Tkin ? Kinetic temperature 66- 69 F4.1 K e_Tkin ? rms uncertainty on Tkin
Acknowledgements: Igor Zinchenko References: Zinchenko I., Paper III 1995A&A...303..554Z Lapinov et al., Paper VI 1998A&A...336.1007L
(End) Patricia Bauer [CDS] 03-Dec-1996
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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