2011ApJ...741...94Y


Query : 2011ApJ...741...94Y

2011ApJ...741...94Y - Astrophys. J., 741, 94 (2011/November-2)

High velocity precessing jets from the water fountain IRAS 18286-0959 revealed by Very Long Baseline Array observations.

YUNG B.H.K., NAKASHIMA J.-I., IMAI H., DEGUCHI S., DIAMOND P.J. and KWOK S.

Abstract (from CDS):

We report the results of multi-epoch Very Long Baseline Array observations of the 22.2 GHz H2 O maser emission associated with the "water fountain" IRAS 18286-0959. We suggest that this object is the second example of a highly collimated bipolar precessing outflow traced by H2 O maser emission, the other is W 43A. The detected H2 O emission peaks are distributed over a velocity range from -50 km/s to 150 km/s. The spatial distribution of over 70% of the identified maser features is found to be highly collimated along a spiral jet (jet 1) extended southeast to northwest; the remaining features appear to trace another spiral jet (jet 2) with a different orientation. The two jets form a "double-helix" pattern which lies across ∼200 mas. The maser distribution is reasonably fit by a model consisting of two bipolar precessing jets. The three-dimensional velocities of jet 1 and jet 2 are derived to be 138 km/s and 99 km/s, respectively. The precession period of jet 1 is about 56 years. For jet 2, three possible models are tested and they give different values for the kinematic parameters. We propose that the appearance of two jets is the result of a single driving source with significant proper motion.

Abstract Copyright:

Journal keyword(s): masers - stars: AGB and post-AGB - stars: evolution - stars: winds, outflows

VizieR on-line data: <Available at CDS (J/ApJ/741/94): table2.dat table3.dat>

Simbad objects: 13

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Number of rows : 13
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 IRAS 16342-3814 pA* 16 37 39.8700524769 -38 20 17.440442399           ~ 131 0
2 IRAS 16552-3050 pA? 16 58 27.31 -30 55 07.9           ~ 25 1
3 4C 09.57 BLL 17 51 32.81857318 +09 39 00.7284829   17.46 16.78 15.57   ~ 852 1
4 OH 9.097 -0.392 OH* 18 07 20.861 -21 16 10.86           ~ 33 0
5 IRAS 18113-2503 pA? 18 14 27.2682296591 -25 03 00.472537854           ~ 24 0
6 IRAS 18286-0959 pA* 18 31 22.94232 -09 57 21.3948           ~ 32 0
7 ICRF J183220.8-103511 G 18 32 20.83647 -10 35 11.1968           ~ 75 1
8 OH 31.0 +0.0 OH* 18 47 41.13768 -01 45 11.4048           O-rich 132 1
9 IRAS 18460-0151 Mas 18 48 42.8 -01 48 40           ~ 43 0
10 W 49 SFR 19 10 20 +09 07.7           ~ 529 1
11 IRAS 19134+2131 pA* 19 15 35.2088301392 +21 36 33.815011564           ~ 60 0
12 [MHL2007] G046.2561-01.4763 1 Y*? 19 21 25.09 +11 08 41.0           ~ 22 0
13 W 51 SNR 19 23 50 +14 06.0           ~ 1192 1

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2021.09.23-04:33:10

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