2006A&A...447L...9G


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET20:45:31

2006A&A...447L...9G - Astronomy and Astrophysics, volume 447, L9-12 (2006/2-4)

Evidence supporting the kinematic interpretation of water maser proper motions.

GODDI C., MOSCADELLI L., TORRELLES J.M., USCANGA L. and CESARONI R.

Abstract (from CDS):

We have analyzed multi-epoch 22 GHz water maser observations performed with the Very Long Baseline Array (VLBA) towards the high-mass star forming region (SFR) G24.78+0.08. The spatial structure of the water maser integrated intensity has been obtained at three different epochs and found to maintain a very remarkable persistent morphology over the three epochs. Evidence of systematic (expanding) motions for the whole structure traced by the maser emission is also reported. In addition, we have obtained, from previously reported data, the integrated emission of a cluster of water masers spread over ≃10mas within the expanding shell of ≃0.16'' size around the young stellar object W75 N (B)-VLA 2. As in G24.78+0.8, we also find that the morphology of the integrated intensity of the water masers of this cluster persists over different observed epochs. These results strongly support the interpretation that the measured proper motions of the water masers are due to real physical motions of distinct blobs of maser-emitting gas, rather than to other effects, such as a travelling background illuminating wave or turbulence in the circumstellar medium. This result is crucial in astrophysical applications of maser proper-motion measurements, including distance determinations and studies of circumstellar gas kinematics in SFRs and late-type stars.

Abstract Copyright:

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

CDS comments: Fig.1, 2: water masers features not in SIMBAD

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME W3 IRS 5 Y*O 02 25 40.54 +62 05 51.4           B1 330 0
2 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 953 2
3 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2053 1
4 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 549 1
5 GAL 024.78+00.08 HII 18 36.2 -07 13           ~ 75 0
6 W 49n HII 19 10 13.2 +09 06 12           ~ 423 3
7 W 49 SFR 19 10 20 +09 07.7           ~ 521 1
8 W 51 SNR 19 23 50 +14 06.0           ~ 1174 1
9 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 365 1
10 NAME W75N(B) HII 20 38 36.46 +42 37 34.9           ~ 31 0
11 [TGR97] VLA 2 HII 20 38 36.482 +42 37 34.08           ~ 48 0

    Equat.    Gal    SGal    Ecl

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2021.03.08-20:45:31

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