2004A&A...420..929G


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.29CEST03:31:50

2004A&A...420..929G - Astronomy and Astrophysics, volume 420, 929-936 (2004/6-4)

EVN observations of H2O masers towards the high-mass young stellar object in AFGL 5142.

GODDI C., MOSCADELLI L., ALEF W. and BRAND J.

Abstract (from CDS):

We have conducted multi-epoch EVN observations of the 22.2GHz water masers towards the high-mass young stellar object in AFGL 5142. With four observing epochs, spanning a time of ∼1-year, 12 distinct maser features have been detected, 7 of which were detected in more than one epoch. The positions and velocities of the VLBI features agree well with those of the emission centers previously identified by means of VLA observations. For a few features, persistent over three or four epochs, accurate values of the proper motions are derived. The observed proper motions have an amplitude of 15-20km/s, significantly larger than the range of variation of the line-of-sight velocities (±4km/s around the systemic velocity). On the basis of their spatial distribution, the observed maser features can be divided into two groups. A model fit to the positions and velocities of the maser features of Group I, detected in the same region (within ∼500mas) where the massive YSO should be located, demonstrates that these might arise on the surface of a nearly edge-on Keplerian disk, rotating around a massive young stellar object. The maser features of Group II, found at large distances from the YSO (≥1''), have positions and line-of-sight velocities in agreement with the blue-shifted lobe of a large-scale molecular outflow (traced by the HCO+ and SiO emission), and might result from the interaction between the gas flowing away from the young stellar object and the ambient gas of the progenitor molecular core.

Abstract Copyright:

Journal keyword(s): masers - stars: formation - ISM: individual objects: AFGL 5142 - ISM: kinematics and dynamics - radio lines: ISM

Status at CDS:  

CDS comments: Table 1: H2O Maser features in AFGL 5142 not in SIMBAD.

Simbad objects: 14

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Number of rows : 14

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 328 0
2 GAL 174.20-00.08 Cld 05 30 45.9 +33 47 56           ~ 184 2
3 QSO J0530+13 QSO 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 877 1
4 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1986 1
5 NGC 2071 RNe 05 47 10 +00 18.0           ~ 608 1
6 7C 064253.00+445430.00 QSO 06 46 32.02599463 +44 51 16.5901237   19.57 18.49 18.64   ~ 320 1
7 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 1991 1
8 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1894 1
9 8C 1803+784 BLL 18 00 45.6831135718 +78 28 04.017792333   16.4 16.4 15.46   ~ 657 1
10 W 49 SFR 19 10 20 +09 07.7           ~ 507 1
11 W 51 SNR 19 23 50 +14 06.0           ~ 1138 1
12 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 394 0
13 NAME IC 1396 North CGb 21 40 42.6537 +58 16 01.882           ~ 182 1
14 3C 454.3 QSO 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2493 2

    Equat.    Gal    SGal    Ecl

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2020.05.29-03:31:50

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