2005A&A...432..161G


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST04:47:27

2005A&A...432..161G - Astronomy and Astrophysics, volume 432, 161-173 (2005/3-2)

Kinematics of H2O masers in high-mass star forming regions.

GODDI C., MOSCADELLI L., ALEF W., TARCHI A., BRAND J. and PANI M.

Abstract (from CDS):

We have conducted multi-epoch EVN observations of the 22.2 GHz water masers towards four high-mass star forming regions (Sh 2-255 IR, IRAS 23139+5939, WB89-234, and OMC2). The (three) observing epochs span 6 months. In each region, the H2O maser emission likely originates close (within a few hundred AU) to a forming high-mass YSO. Several maser features (∼10) have been detected for each source and, for those features persistent over the three epochs, proper motions have been derived. The amplitudes of the proper motions are found to be larger than the range of variation of the line-of-sight velocities and in each of the observed sources the proper motion orientation seems to indicate expansion. The gas kinematics traced by the 22.2GHz H2O masers is compatible with the shock-excited nature of water maser emission. Three different kinematic models (a spherical expanding shell, a Keplerian rotating disk and a conical outflow) were fitted to the 3-dimensional velocity field of the detected maser features. The results of these fits, together with the comparison of the VLBI maps with the highest-resolution images of the sources in several thermal tracers, suggest that the water maser features most likely trace the inner portion of the molecular outflows detected at much larger scales.

Abstract Copyright:

Journal keyword(s): masers - stars: formation - ISM: kinematics and dynamics - radio lines: ISM

Nomenclature: Table 3: [GMA2005] Sh 2-255 IR NN (Nos 1-14), [GMA2005] IRAS 23139+5939 N (Nos 1-9), [GMA2005] WB89 234 NN (Nos 1-12), [GMA2005] OMC 2 N (Nos 1-3).

Simbad objects: 25

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Number of rows : 25

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 NAME W3 IRS 5 Y*O 02 25 40.54 +62 05 51.4           B1 330 0
2 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 967 3
3 GAL 174.20-00.08 Cld 05 30 45.9 +33 47 56           ~ 184 2
4 NAME OMC 2 IRS 3 HII 05 35 26.00 -05 10 16.6           ~ 61 0
5 V* V2455 Ori Or* 05 35 26.83584 -05 09 24.4728           ~ 32 1
6 OMC 2 MoC 05 35 27 -05 10.1           ~ 393 1
7 NAME OMC 2 IRS 4 IR 05 35 27.3 -05 09 39           ~ 18 0
8 2MASS J05352762-0509337 Y*O 05 35 27.622 -05 09 33.78           ~ 72 0
9 V* V2467 Ori Or* 05 35 27.6432297049 -05 09 37.146459776         19.580 ~ 36 0
10 IRAS 05413-0104 IR 05 43 51.5 -01 02 52           ~ 77 0
11 [PGS81] IRS 3 IR 05 47 04.63 +00 21 47.9           ~ 50 0
12 [PGS81] IRS 1 Y*O 05 47 04.78 +00 21 42.8           ~ 75 0
13 SH 2-257 HII 06 12 44 +17 59.3           ~ 122 1
14 NAME S255-2 IR 06 12 53.8 +17 59 22           ~ 38 0
15 NAME SH 2-255 IRS 1 Y*O 06 12 54.0060 +17 59 22.958           ~ 319 0
16 NAME SH 2-255 IRS 2 Y*O 06 12 54.88 +17 59 21.8           ~ 13 0
17 NAME SH 2-255 IRS 3 Y*O 06 12 55.03 +17 59 29.9           ~ 16 0
18 IC 2162 HII 06 13 04.1 +17 58 44           ~ 339 2
19 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 399 0
20 [HRB81] W75N(Ba) HII 20 38 36.445 +42 37 34.82           ~ 44 0
21 [TGR97] VLA 2 HII 20 38 36.482 +42 37 34.08           ~ 47 0
22 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 699 2
23 [CTC2002] VLA-R5 reg 22 56 17.977 +62 01 49.04           ~ 13 0
24 IRAS 23004+5642 IR 23 02 34.712 +56 59 17.02           ~ 24 0
25 IRAS 23139+5939 Y*O 23 16 10.39680 +59 55 28.2396           ~ 77 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-04:47:27

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