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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:

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.

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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Detection table from Caswell & Phillips (2008)

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DSS colored	2MASS colored	WISE colored
PACS color (70-160 um)	SPIRE color (250-500 um)	GLIMPSE 360
SDSS color	IRAC color I1,I2,I4	NVSS (1.4GHz)
ATLASGAL 870 um	ATLASGAL 870 um + Planck	Bolocam 1.1 mm
UKIDSS K Download UKIDSS K FITS	2MASS K Download 2MASS K FITS

select MAX(met2_data_all.ra_hms) as ra_hms,MAX(met2_data_all.dec_dms) as dec_dms,MAX(met2_data_all.source_name) as source_name,MAX(met2_data_all.ra) as ra,MAX(met2_data_all.dec) as dec,MAX(met2_data_all.l) as l,MAX(met2_data_all.b) as b,MAX(met2_data_all.grp) as grp,MAX(met2_data_all.other_name) as other_name,MAX(met2_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(met2_data_all.line) as line,MAX(met2_data_all.vrange) as vrange,MAX(met2_data_all.vpeak) as vpeak,MAX(met2_data_all.peak) as peak,MAX(met2_data_all.fwhm) as fwhm,MAX(met2_data_all.int) as int,MAX(met2_data_all.rms) as rms,MAX(met2_data_all.units) as units,MAX(met2_data_all.units_rms) as units_rms,MAX(met2_data_all.date_txt) as date_txt,MAX(met2_data_all.telescope_ref) as telescope_ref,MAX(met2_data_all.telescope_conf) as telescope_conf,MAX(met2_data_all.v_step) as v_step,MAX(met2_data_all.beam) as beam,MAX(met2_data_all.beam_maj) as beam_maj,MAX(met2_data_all.beam_min) as beam_min,MAX(met2_data_all.beam_pa) as beam_pa,MAX(met2_data_all.ref) as ref,MAX(met2_data_all.list_ref) as list_ref,MAX(met2_data_all.ascii) as ascii,MAX(met2_data_all.url) as url,MAX(met2_data_all.image) as image,MAX(met2_data_all.image2) as image2,MAX(met2_data_all.image3) as image3,MAX(met2_data_all.descr) as descr,MAX(met2_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(met2_data_all.dist) as dist,1 as dist_parallax,MAX(met2_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 met2_data_all  LEFT JOIN all_objects_withmet ON met2_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 met2_data_all.line=transitions."Line"  WHERE ref ilike 'CAS08' AND detected=true AND hide=false GROUP BY ref

select met2_data_all.ra_hms,met2_data_all.dec_dms,met2_data_all.source_name,met2_data_all.ra,met2_data_all.dec,met2_data_all.l,met2_data_all.b,met2_data_all.grp,met2_data_all.other_name,met2_data_all.other_desc,met2_data_all.thermal,met2_data_all.line,met2_data_all.vrange,met2_data_all.vpeak,met2_data_all.peak,met2_data_all.fwhm,met2_data_all.int,met2_data_all.rms,met2_data_all.units,met2_data_all.units_rms,met2_data_all.date_txt,met2_data_all.telescope_ref,met2_data_all.telescope_conf,met2_data_all.v_step,met2_data_all.beam,met2_data_all.beam_maj,met2_data_all.beam_min,met2_data_all.beam_pa,met2_data_all.ref,met2_data_all.list_ref,met2_data_all.ascii,met2_data_all.url,met2_data_all.image,met2_data_all.image2,met2_data_all.image3,met2_data_all.descr,met2_data_all.id,met2_data_all.mjy_flag,met2_data_all.rms_mjy_flag,met2_data_all.dist,met2_data_all.dist_parallax,met2_data_all.date_txt,line_det,type,simbad_types_cat FROM met2_data_all   LEFT JOIN all_objects_withmet ON met2_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 met2_data_all.line=transitions."Line"  WHERE ref ilike 'CAS08' AND detected=true AND hide=false ORDER BY detected DESC,id

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CAS08 - Water maser 353.273+0.641, the prime example of a class dominated by a blueshifted outflow

View as list of objects

Detection table from Caswell & Phillips (2008)