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H
2
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SET02 - Water Masers as Tracers of Protostellar Disks and Outflows in the Intermediate-Mass Star-forming Region NGC 2071
Interferometry data
Short title
: Seth et al. (2002)
Authors
: Seth, A. C.Greenhill, L. J.Holder, B. P.
Journal
: The Astrophysical Journal, Volume 581, Issue 1, pp. 325-334.
Bibcode
:
2002ApJ...581..325S
Target type
: YSO
Transitions
: H2O_22
Abstract
We have mapped the water maser emission associated with the infrared centers IRS 1 and IRS 3 of the NGC 2071IR star-forming region at four epochs over ~4 months with the Very Long Baseline Array. We detected 269 maser features with ~1 km s-1 line widths and measured 30 proper motions. In each infrared center, the water maser emission appears to trace parts of a protostellar disk and collimated outflow. The disk components are ~9 and ~17 AU long in IRS 3 and IRS 1, respectively, and ~2 AU wide. They are identified as disks by their compact size, elongation parallel to the direction of known IR polarization, central location in the maser maps, small internal proper motions, and proximity to λ 1.3 cm continuum emission. The outflows have axes perpendicular to the disks and exhibit proper motions of up to ~42 km s-1. They are outlined by maser emission up to ~260 AU from the protostars. The IRS 3 outflow appears to be conical on one side, while the IRS 1 outflow comprises a narrowly collimated bipolar flow surrounded by outward-facing, funnel-shaped cavities. The detection of water maser emission tracing such compact disk components and specifically conical or funnel-shaped structures is unusual. The fact that the distributions are similar in IRS 3 and IRS 1 may indicate that the two infrared centers are roughly coeval. NGC 2071IR provides a rare opportunity to resolve the structures and dynamics of disks and outflows together and to do so for two protostars that are only ~2000 AU apart (in projection) in a deeply embedded star-forming region of intermediate luminosity.
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Detection table from Seth et al. (2002)
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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
V
step
RMS
Beam
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(mas)
(mas)
(deg.)
(deg.)
H
2
O
(km/s)
(Jy)
(km/s)
(Jy)
(arcsec)
Yes
/
No
(kpc)
1
+05 47 4.7774
+00 21 42.803
205.109947
-14.108931
G205.109-14.109
NGC 2071 IR
Image
Descr
22 GHz
;
7.87 .. 18.86
0.095 .. 42.556
VLBA
0.42
0.023
0.00136 x 0.00126
+H
2
O
+CH
3
OH I
-CH
3
OH II
+OH
SFR
1996 Mar 24 - Aug 3
+05 47 4.78074
+00 21 42.8059
49.527 mas
1.938 mas
205.109953
-14.108918
1
NGC 2071 IR
18.86 (0.55)
0.238 (0.042)
+05 47 4.78076
+00 21 42.8063
49.753 mas
2.281 mas
205.109953
-14.108918
2
NGC 2071 IR
18.49 (0.21)
0.174 (0.01)
+05 47 4.78288
+00 21 42.8031
81.567 mas
-0.891 mas
205.109958
-14.108910
3
NGC 2071 IR
15.39 (0.01)
42.556 (1.094)
+05 47 4.77796
+00 21 42.8138
7.851 mas
9.846 mas
205.109945
-14.108927
4
NGC 2071 IR
15.22 (0.21)
0.32 (0.018)
+05 47 4.77761
+00 21 42.8453
2.609 mas
41.282 mas
205.109937
-14.108924
5
NGC 2071 IR
13.17 (0.21)
0.095 (0.014)
+05 47 4.78439
+00 21 42.5697
104.294 mas
-234.312 mas
205.110020
-14.108935
6
NGC 2071 IR
12.75 (0.21)
0.122 (0.014)
+05 47 4.78437
+00 21 42.5679
103.908 mas
-236.052 mas
205.110021
-14.108936
7
NGC 2071 IR
12.75 (0.21)
0.157 (0.014)
+05 47 4.77762
+00 21 42.8448
2.741 mas
40.831 mas
205.109937
-14.108924
8
NGC 2071 IR
11.43 (0.05)
1.437 (0.093)
+05 47 4.77754
+00 21 42.8448
1.485 mas
40.768 mas
205.109937
-14.108925
9
NGC 2071 IR
10.64 (0.21)
0.154 (0.014)
+05 47 4.77745
+00 21 42.8475
0.196 mas
43.502 mas
205.109936
-14.108925
10
NGC 2071 IR
7.87 (0.03)
1.583 (0.084)
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DSS colored
2MASS colored
WISE colored
SDSS color
IRAC color I1,I2,I4
GLIMPSE 360
PACS color (70-160 um)
SPIRE color (250-500 um)
NVSS (1.4GHz)
ATLASGAL 870 um
ATLASGAL 870 um + Planck
Bolocam 1.1 mm
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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 'SET02' 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 'SET02' AND detected=true AND hide=false ORDER BY detected DESC,id
