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CH3OH_II
CAS08 - Water maser 353.273+0.641, the prime example of a class dominated by a blueshifted outflow
Short title
: Caswell & Phillips (2008)
Authors
: Caswell, J. L.Phillips, C. J.
Journal
: Monthly Notices of the Royal Astronomical Society, Volume 386, Issue 3, pp. 1521-1526.
Bibcode
:
2008MNRAS.386.1521C
Target type
: High_mass_SFR
Transitions
: H2O_22,CH3OH_6(II)
Abstract
The Galactic site 353.273+0.641 shows maser emission at both the 22-GHz transition of water and the 6.668-GHz transition of methanol. We argue that the methanol maser establishes the site as most likely a newly forming massive star, and the narrow velocity range of this emission establishes a reliable systemic velocity. The water maser shows weak emission at this systemic velocity and much stronger emission at a velocity blueshifted by 50 kms
-1
. It is a second excellent example (joining 291.270-0.719) of what must now be regarded as an emerging distinct class of massive young stellar objects showing dominant blueshifted water maser outflows. We also present new data for 351.243+0.671 that strengthen its claim to be yet another member. There appears to be no complementary class of water maser dominated by redshifted outflows. The mechanism that favours dominant blueshifted outflows in preference to redshifted outflows needs further exploration.
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individual components
ID
Obs. RA
Obs. Dec
l
b
Group id
Source name
Image
Descr.
Line
V
range
Telescope
Beam
Detection
Class
Dist. (parallax)
Date
(J2000)
(J2000)
(deg.)
(deg.)
H
2
O
(km/s)
(arcsec)
Yes
/
No
(kpc)
1
17 26 1.6
-34 15 14.7
353.2732
0.6412
G353.273+0.641
353.273+0.641
Image
Descr
22 GHz
;
-70;-40
ATCA
36 x 26
+H
2
O
+CH
3
OH II
SFR
2007 May
2
17 20 17.8
-35 54 42.8
351.2429
0.6708
G351.240+0.670
351.243+0.671
Image
Descr
22 GHz
;
-108;84
ATCA
36 x 26
+H
2
O
+CH
3
OH I
+CH
3
OH II
+OH
SFR
2007 May
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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 'CAS08' 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 'CAS08' AND detected=true AND hide=false ORDER BY detected DESC,id