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H
2
O
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CH3OH_II
IMM19 - Anomalous peculiar motions of high-mass young stars in the Scutum spiral arm
Short title
: Immer et al. (2019)
Authors
: Immer, K.Li, J.Quiroga-Nuñez, L. H.Reid, M. J.Zhang, B.Moscadelli, L.Rygl, K. L. J.
Journal
: Astronomy & Astrophysics, Volume 632, id.A123,
26
pp.
Bibcode
:
2019A&A...632A.123I
Target type
: High_mass_SFR
Transitions
: CH3OH_6(II)
Abstract
We present trigonometric parallax and proper motion measurements toward 22 GHz water and 6.7 GHz methanol masers in 16 high-mass star-forming regions. These sources are all located in the Scutum spiral arm of the Milky Way. The observations were conducted as part of the Bar and Spiral Structure Legacy (BeSSeL) survey. A combination of 14 sources from a forthcoming study and 14 sources from the literature, we now have a sample of 44 sources in the Scutum spiral arm, covering a Galactic longitude range from 0° to 33°. A group of 16 sources shows large peculiar motions of which 13 are oriented toward the inner Galaxy. A likely explanation for these high peculiar motions is the combined gravitational potential of the spiral arm and the Galactic bar.
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individual components
ID
Obs. RA
Obs. Dec
l
b
Group id
Source name
Image
Descr.
Line
V
peak
Telescope
V
step
Detection
Class
Distance
Dist. (parallax)
Date
(J2000)
(J2000)
(deg.)
(deg.)
H
2
O
(km/s)
(km/s)
Yes
/
No
(kpc)
(kpc)
1
18 34 31.2
-08 42 47.5
23.2566
-0.2406
G23.251-0.240
G023.25-00.24
Image
Descr
6.6 GHz (II)
;
63 (3)
VLBA
0.72
+H
2
O
+CH
3
OH II
+OH
SFR
5.920
Oct. 2012 - Oct. 2013
2
18 42 42.6
-04 15 35.2
28.1467
-0.0045
G28.147-0.004
G028.14-00.00
6.6 GHz (II)
;
100 (5)
VLBA
0.72
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
6.330
Oct. 2012 - Oct. 2013
3
18 43 46.2
-03 35 29.6
28.8620
0.0657
G28.862+0.066
G028.86+00.06
22 GHz
;
100 (10)
VLBA
0.42
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
4.980
Feb. 2011 - Apr. 2012
4
18 45 59.6
-02 45 5.5
29.8626
-0.0442
G29.862-0.044
G029.86-00.04
6.6 GHz (II)
;
100 (4)
VLBA
0.72
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
4.520
Oct. 2012 - Oct. 2013
5
18 46 3.7
-02 39 21
29.9557
-0.0159
G29.956-0.016
G029.95-00.01
6.6 GHz (II)
;
99 (5)
VLBA
0.72
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR_MIXED
4.500
Oct. 2012 - Oct. 2013
6
18 45 40
-02 34 32.6
29.9818
0.1087
G29.982+0.108
G029.98+00.10
22 GHz
;
109 (10)
VLBA
0.11
+H
2
O
-CH
3
OH II
+OH
UNK
6.410
Nov. 2013 - Apr. 2015
7
18 47 8.3
-02 29 29.4
30.2245
-0.1800
G30.199-0.169
G030.22-00.18
6.6 GHz (II)
;
113 (3)
VLBA
0.72
+H
2
O
-CH
3
OH I
+CH
3
OH II
+OH
SFR
3.520
Apr. 2014 - Apr. 2015
8
18 47 40.8
-02 20 30.3
30.4195
-0.2320
G30.419-0.232
G030.41-00.23
6.6 GHz (II)
;
103 (3)
VLBA
0.72
+H
2
O
+CH
3
OH I
+CH
3
OH II
-OH
SFR
3.950
Oct. 2012 - Oct. 2013
9
18 47 36.8
-02 00 55
30.7025
-0.0684
G30.702-0.068
G030.70-00.06
6.6 GHz (II)
;
89 (3)
VLBA
0.72
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
6.540
Oct. 2012 - Oct. 2013
10
18 47 37.7
-01 57 54.7
30.7488
-0.0489
G30.758-0.050
G030.74-00.04
6.6 GHz (II)
;
88 (3)
VLBA
0.72
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
3.070
Oct. 2012 - Oct. 2013
11
18 46 48.1
-01 48 54
30.7881
0.2036
G30.788+0.204
G030.78+00.20
6.6 GHz (II)
;
82 (5)
VLBA
0.72
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
7.140
Apr. 2014 - Apr. 2015
12
18 47 47
-01 54 26.7
30.8178
-0.0568
G30.818-0.057
G030.81-00.05
6.6 GHz (II)
;
105 (5)
VLBA
0.72
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
3.120
Oct. 2012 - Oct. 2013
13
18 48 22
-01 48 30.6
30.9724
-0.1416
G30.972-0.141
G030.97-00.14
6.6 GHz (II)
;
77 (3)
VLBA
0.72
+H
2
O
+CH
3
OH I
+CH
3
OH II
-OH
SFR
3.400
Apr. 2014 - Apr. 2015
14
18 47 34.3
-01 12 47
31.4116
0.3069
G31.412+0.307
G031.41+00.30
22 GHz
;
97 (15)
VLBA
0.11
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
3.750
Nov. 2013 - Apr. 2015
15
18 49 36.6
-00 45 42.7
32.0455
0.0594
G32.045+0.059
G032.04+00.05
6.6 GHz (II)
;
98 (5)
VLBA
0.72
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
5.130
Nov. 2012 - Oct. 2013
16
18 51 59.4
+00 06 34.3
33.0923
-0.0729
G33.092-0.071
G033.09-00.07
6.6 GHz (II)
;
100 (5)
VLBA
0.72
+H
2
O
+CH
3
OH II
-OH
SFR
7.460
Nov. 2012 - Oct. 2013
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GLIMPSE 360
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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 'IMM19' 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 'IMM19' AND detected=true AND hide=false ORDER BY detected DESC,id
