1999ApJ...513..775W

Query : 1999ApJ...513..775W

1999ApJ...513..775W - Astrophys. J., 513, 775-779 (1999/March-2)

The synchrotron jet from the H2O maser source in W3(OH).

WILNER D.J., REID M.J. and MENTEN K.M.

Abstract (from CDS):

We report results of sensitive Very Large Array observations of the 8.4 GHz continuum emission associated with the TW object, a luminous young star located at the center of expansion of the H2O masers in the W3(OH) region. The source has a radio spectral index of -0.6 and exhibits a sinuous double-sided morphology; these are characteristics of a synchrotron jet. No significant changes are seen in the jet morphology in observations separated by 510 days. The inhomogeneous synchrotron model proposed by Reid et al., which is based on the spectrum and size variation with observing frequency, correctly predicts the flux density profile of the radio emission. Secondary radio continuum features located at the extrema of the H2O maser distribution may mark the location of strong shocks and deeply embedded Herbig-Haro objects or additional young stellar objects in the W3(OH) cluster. Several more compact sources are identified in the region, some of which are highly variable. These may be low-mass pre-main-sequence stars with magnetic activity.

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Journal keyword(s): ISM: individual (W3) - ISM: Jets and Outflows - Masers - Radiation Mechanisms: Nonthermal - Radio Continuum: ISM - Stars: Formation

Nomenclature: Table 1: [WRM99] A (Nos A-D).

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [WRM99] A Rad 02 27 02.826 +61 52 15.60           ~ 3 0
2 [WRM99] B Rad 02 27 03.327 +61 52 31.60           ~ 1 0
3 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
4 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
5 [WRM99] C Rad 02 27 04.517 +61 52 26.35           ~ 3 0
6 W 3(H2O) Mas 02 27 04.6 +61 52 25           ~ 154 0
7 NAME Turner-Welch Object Y*O 02 27 04.717 +61 52 24.73           ~ 31 0
8 [BMW93] 022317.406+613900.45 Rad 02 27 04.781 +61 52 28.24           ~ 2 0
9 4C 67.05 Bla 02 28 50.05148365 +67 21 03.0293322   19.5 19.50 18.1   ~ 264 1
10 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
11 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
12 * 9 Sgr Y*O 18 03 52.4450051016 -24 21 38.632254012 5.08 5.97 5.97 5.72 5.70 O4V((f))z 563 0
13 V* AM Her CV* 18 16 13.2546725104 +49 52 04.759613537   15.124 14.808 13.525   M4.5-5Ve 1009 2
14 NAME HH 80-81 HH 18 19 06 -20 51.4           ~ 236 0
15 SS 433 HXB 19 11 49.5647697480 +04 58 57.827127648   16.854 14.643     A7Ib 2253 4
16 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2810 0
17 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 2035 2
18 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 760 2

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