1997A&AS..124..385Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET02:43:05

1997A&AS..124..385Z - Astron. Astrophys., Suppl. Ser., 124, 385-395 (1997/August-0)

Studies of dense cores in regions of massive star formation. V. Structure and kinematics of dense cores from ammonia observations.

ZINCHENKO I., HENNING T. and SCHREYER K.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: clouds - ISM: molecules - radio lines: interstellar

VizieR on-line data: <Available at CDS (J/A+AS/124/385): tables 1, and 5 to 14>

Simbad objects: 21

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Number of rows : 21

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V710 Cas FU* 00 36 46.30 +63 28 54.1           F8II 81 0
2 2MASS J00365177+6329300 FU* 00 36 51.7734039102 +63 29 30.120609233     14.1     F5III 27 0
3 IC 1848 OpC 02 51 06 +60 24.6   6.87 6.5     ~ 432 2
4 SH 2-201 HII 03 03 17.9 +60 27 52           ~ 111 0
5 SH 2-231 HII 05 39 12.9 +35 45 54           ~ 116 0
6 BFS 48 HII 05 51 07.8 +25 45 36           ~ 12 0
7 NAME SH 2-255 IRS 1 Y*O 06 12 54.0060 +17 59 22.958           ~ 312 0
8 IC 2162 HII 06 13 04.1 +17 58 44           ~ 336 2
9 SH 2-76 E SFR 18 56 12 +07 53.4           ~ 31 0
10 LBN 040.46+02.46 HII 18 56.4 +07 48   12.16 11.66     ~ 22 0
11 LBN 039.95-01.44 HII 19 08 31.0 +05 35 50   13.70 12.39     ~ 33 0
12 NGC 6823 OpC 19 43 09 +23 18.0   7.71 7.1     ~ 248 2
13 SH 2-87 HII 19 46 20.7 +24 35 15           ~ 151 2
14 LBN 061.50+00.29 HII 19 46 45.7 +25 12 56           ~ 62 0
15 SH 2-88 B HII 19 46 47.329 +25 12 45.62           ~ 152 2
16 LBN 063.10+00.46 HII 19 49 11.7 +26 51 36   14.60 13.63     ~ 50 0
17 LBN 064.20-00.44 HII 19 55 02 +27 12.8   15.04 13.64     ~ 28 0
18 LBN 070.24+01.53 HII 20 01 44.7 +33 31 14           ~ 33 1
19 SH 2-145 HII 22 25.5 +64 18           ~ 22 1
20 LBN 514 HII 22 49 29.0023541917 +59 54 56.180598057           ~ 103 1
21 LBN 112.02+00.90 HII 23 15.5 +61 51           ~ 16 0

    Equat.    Gal    SGal    Ecl

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2020.02.17-02:43:05

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