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H
2
O
FUR99 - VLA Observations of H
2
O Masers in the Class 0 Protostar S106 FIR: Evidence for a 10 AU Scale Accelerating Jetlike Flow
Interferometry data
Short title
: Furuya et al. (1999)
Authors
: Furuya, Ray S., Kitamura, Yoshimi, Saito, Masao, Kawabe, Ryohei, Wootten, H. Alwyn
Journal
: The Astrophysical Journal, Volume 525, Issue 2, pp. 821-831.
Bibcode
:
1999ApJ...525..821F
Target type
: HII,YSO
Transitions
: H2O_22
Abstract
We conducted VLA observations at 0.06'' resolution of the 22 GHz water masers toward the Class 0 source S106 FIR (d=600 pc 15'' west of S106 IRS 4) on two epochs separated by ~3 months. Two compact clusters of the maser spots were found in the center of the submillimeter core of S106 FIR. The separation of the clusters was ~80 mas (48 AU) along P.A.=70deg, and the size of each cluster was ~20 x 10 mas. The western cluster, which had three maser components, was 8.0 km s-1 blueshifted, and the eastern cluster, which had a single component, was 7.0 km s-1 redshifted with respect to the ambient cloud velocity. Each component was composed of a few spatially localized maser spots and was aligned on a line connecting the clusters. We found relative proper motions of the components with ~30 mas yr-1 (18 AU yr-1) along the line. In addition, a series of single-dish observations shows that the maser components drifted with radial accelerations of ~1 km s-1 yr-1. These facts indicate that the masers could be excited by a 10 AU scale jetlike accelerating flow ejected from an assumed protostar located between the two clusters. The outflow size traced by the masers was 50 x 5 AU after correction for an inclination angle of 10°, which was derived from the relative proper motions and radial velocities of the maser components. The three-dimensional outflow velocity ranged from 40 to 70 km s-1 assuming symmetric proper motions for the blue and red components. Since no distinct CO molecular outflows have been detected so far, we suggest that S106 FIR is an extremely young protostar observed just after the onset of outflowing activity.
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Detection table from Furuya et al. (1999)
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individual components
ID
Obs. RA
Obs. Dec
RA offset
Dec offset
l
b
Group id
#
Source name
Image
Descr.
Line
V
peak
F
peak
Telescope
Configuration
V
step
RMS
Beam
PA
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
H
2
O
(km/s)
(Jy)
(km/s)
(mJy/beam)
(arcsec)
(deg.)
Yes
/
No
(kpc)
1
+20 27 25.4702
+37 22 48.7541
76.380935
-0.617686
G76.381-0.618
S106 FIR A0
Image
Descr
22 GHz
;
6.4
1.9
NRAOVLA
A
0.3
10.500
0.063 x 0.061
85
+H
2
O
-CH
3
OH I
-CH
3
OH II
+OH
SFR_MIXED
1996 Oct 15
+20 27 25.4702
+37 22 48.7524
0 mas
0 mas
76.380935
-0.617686
1
S106 FIR A0
6.4
1.9
2
+20 27 25.4702
+37 22 48.7541
76.380935
-0.617686
G76.381-0.618
S106 FIR A1
22 GHz
;
-7.4
0.3
NRAOVLA
A
0.3
10.500
0.063 x 0.061
85
+H
2
O
-CH
3
OH I
-CH
3
OH II
+OH
SFR_MIXED
1996 Oct 15
+20 27 25.4748
+37 22 48.7327
68.9 mas
-19.7 mas
76.380939
-0.617702
1
S106 FIR A1
-7.4
0.3
3
+20 27 25.4702
+37 22 48.7541
76.380935
-0.617686
G76.381-0.618
S106 FIR A2
22 GHz
;
-9.4
1.1
NRAOVLA
A
0.3
10.500
0.063 x 0.061
85
+H
2
O
-CH
3
OH I
-CH
3
OH II
+OH
SFR_MIXED
1996 Oct 15
+20 27 25.4749
+37 22 48.7327
70.5 mas
-19.7 mas
76.380940
-0.617702
1
S106 FIR A2
-9.4
1.1
4
+20 27 25.4702
+37 22 48.7541
76.380935
-0.617686
G76.381-0.618
S106 FIR A3
22 GHz
;
-12.1
1.3
NRAOVLA
A
0.3
10.500
0.063 x 0.061
85
+H
2
O
-CH
3
OH I
-CH
3
OH II
+OH
SFR_MIXED
1996 Oct 15
+20 27 25.4757
+37 22 48.7326
81.3 mas
-19.8 mas
76.380941
-0.617704
1
S106 FIR A3
-12.1
1.3
5
+20 27 25.3871
+37 22 48.7492
76.380774
-0.617463
G76.381-0.618
S106 FIR B0
22 GHz
;
6.7
1.1
NRAOVLA
BnA
0.3
9.400
0.25 x 0.08
89
+H
2
O
-CH
3
OH I
-CH
3
OH II
+OH
SFR_MIXED
1997 Jan 23
+20 27 25.3807
+37 22 48.7708
-93.8 mas
22 mas
76.380767
-0.617442
1
S106 FIR B0
6.7
1.1
6
+20 27 25.3871
+37 22 48.7492
76.380774
-0.617463
G76.381-0.618
S106 FIR B1
22 GHz
;
-7.8
1.6
NRAOVLA
BnA
0.3
9.400
0.25 x 0.08
89
+H
2
O
-CH
3
OH I
-CH
3
OH II
+OH
SFR_MIXED
1997 Jan 23
+20 27 25.3861
+37 22 48.7499
-12.3 mas
1.09 mas
76.380772
-0.617460
1
S106 FIR B1
-7.8
1.6
7
+20 27 25.3871
+37 22 48.7492
76.380774
-0.617463
G76.381-0.618
S106 FIR B2
22 GHz
;
-9.8
2.2
NRAOVLA
BnA
0.3
9.400
0.25 x 0.08
89
+H
2
O
-CH
3
OH I
-CH
3
OH II
+OH
SFR_MIXED
1997 Jan 23
+20 27 25.3868
+37 22 48.735
-1.7 mas
-13.8 mas
76.380770
-0.617465
1
S106 FIR B2
-9.8
2.2
8
+20 27 25.3871
+37 22 48.7492
76.380774
-0.617463
G76.381-0.618
S106 FIR B3
22 GHz
;
-13.7
4
NRAOVLA
BnA
0.3
9.400
0.25 x 0.08
89
+H
2
O
-CH
3
OH I
-CH
3
OH II
+OH
SFR_MIXED
1997 Jan 23
+20 27 25.387
+37 22 48.7488
0 mas
0 mas
76.380774
-0.617463
1
S106 FIR B3
-13.7
4
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select MAX(h2o_data_all.ra_hms) as ra_hms,MAX(h2o_data_all.dec_dms) as dec_dms,MAX(h2o_data_all.source_name) as source_name,MAX(h2o_data_all.ra) as ra,MAX(h2o_data_all.dec) as dec,MAX(h2o_data_all.l) as l,MAX(h2o_data_all.b) as b,MAX(h2o_data_all.grp) as grp,MAX(h2o_data_all.other_name) as other_name,MAX(h2o_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(h2o_data_all.line) as line,MAX(h2o_data_all.vrange) as vrange,MAX(h2o_data_all.vpeak) as vpeak,MAX(h2o_data_all.peak) as peak,MAX(h2o_data_all.fwhm) as fwhm,MAX(h2o_data_all.int) as int,MAX(h2o_data_all.rms) as rms,MAX(h2o_data_all.units) as units,MAX(h2o_data_all.units_rms) as units_rms,MAX(h2o_data_all.date_txt) as date_txt,MAX(h2o_data_all.telescope_ref) as telescope_ref,MAX(h2o_data_all.telescope_conf) as telescope_conf,MAX(h2o_data_all.v_step) as v_step,MAX(h2o_data_all.beam) as beam,MAX(h2o_data_all.beam_maj) as beam_maj,MAX(h2o_data_all.beam_min) as beam_min,MAX(h2o_data_all.beam_pa) as beam_pa,MAX(h2o_data_all.ref) as ref,MAX(h2o_data_all.list_ref) as list_ref,MAX(h2o_data_all.ascii) as ascii,MAX(h2o_data_all.url) as url,MAX(h2o_data_all.image) as image,MAX(h2o_data_all.image2) as image2,MAX(h2o_data_all.image3) as image3,MAX(h2o_data_all.descr) as descr,MAX(h2o_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(h2o_data_all.dist) as dist,1 as dist_parallax,MAX(h2o_data_all.date_txt) as date_txt,MAX(line_det) as line_det,MAX(type) as type,MAX(simbad_types_cat) as simbad_types_cat FROM h2o_data_all LEFT JOIN all_objects_withmet ON h2o_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON h2o_data_all.line=transitions."Line" WHERE ref ilike 'FUR99' AND detected=true AND hide=false GROUP BY ref
select h2o_data_all.ra_hms,h2o_data_all.dec_dms,h2o_data_all.source_name,h2o_data_all.ra,h2o_data_all.dec,h2o_data_all.l,h2o_data_all.b,h2o_data_all.grp,h2o_data_all.other_name,h2o_data_all.other_desc,h2o_data_all.thermal,h2o_data_all.line,h2o_data_all.vrange,h2o_data_all.vpeak,h2o_data_all.peak,h2o_data_all.fwhm,h2o_data_all.int,h2o_data_all.rms,h2o_data_all.units,h2o_data_all.units_rms,h2o_data_all.date_txt,h2o_data_all.telescope_ref,h2o_data_all.telescope_conf,h2o_data_all.v_step,h2o_data_all.beam,h2o_data_all.beam_maj,h2o_data_all.beam_min,h2o_data_all.beam_pa,h2o_data_all.ref,h2o_data_all.list_ref,h2o_data_all.ascii,h2o_data_all.url,h2o_data_all.image,h2o_data_all.image2,h2o_data_all.image3,h2o_data_all.descr,h2o_data_all.id,h2o_data_all.mjy_flag,h2o_data_all.rms_mjy_flag,h2o_data_all.dist,h2o_data_all.dist_parallax,h2o_data_all.date_txt,line_det,type,simbad_types_cat FROM h2o_data_all LEFT JOIN all_objects_withmet ON h2o_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON h2o_data_all.line=transitions."Line" WHERE ref ilike 'FUR99' AND detected=true AND hide=false ORDER BY detected DESC,id
