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BRE07 - A search for 22-GHz water masers within the giant molecular cloud associated with RCW 106

Short title: Breen et al. (2007)
Authors: Breen, S. L.Ellingsen, S. P.Johnston-Hollitt, M.Wotherspoon, S.Bains, I.Burton, M. G.Cunningham, M.Lo, N.Senkbeil, C. E.Wong, T.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 377, Issue 2, pp. 491-506.
Bibcode:

Target type: High_mass_SFR

Abstract
We report the results of a blind search for 22-GHz water masers in two regions, covering approximately half a square degree, within the giant molecular cloud associated with RCW 106. The complete search of the two regions was carried out with the 26-m Mount Pleasant radio telescope and resulted in the detection of nine water masers, five of which are new detections. Australia Telescope Compact Array (ATCA) observations of these detections have allowed us to obtain positions with arcsecond accuracy, allowing meaningful comparison with infrared and molecular data for the region. We find that for the regions surveyed there are more water masers than either 6.7-GHz methanol, or main-line OH masers. The water masers are concentrated towards the central axis of the star formation region, in contrast to the 6.7-GHz methanol masers which tend to be located near the periphery. The colours of the GLIMPSE point sources associated with the water masers are similar to those of 6.7-GHz methanol masers, but slightly less red. We have made a statistical investigation of the properties of the ¹³CO and 1.2-mm dust clumps with and without associated water masers. We find that the water masers are associated with the more massive, denser and brighter ¹³CO and 1.2-mm dust clumps. We present statistical models that are able to predict those ¹³CO and 1.2-mm dust clumps that are likely to have associated water masers, with a low misclassification rate.

Abstract

We report the results of a blind search for 22-GHz water masers in two regions, covering approximately half a square degree, within the giant molecular cloud associated with RCW 106. The complete search of the two regions was carried out with the 26-m Mount Pleasant radio telescope and resulted in the detection of nine water masers, five of which are new detections. Australia Telescope Compact Array (ATCA) observations of these detections have allowed us to obtain positions with arcsecond accuracy, allowing meaningful comparison with infrared and molecular data for the region. We find that for the regions surveyed there are more water masers than either 6.7-GHz methanol, or main-line OH masers. The water masers are concentrated towards the central axis of the star formation region, in contrast to the 6.7-GHz methanol masers which tend to be located near the periphery. The colours of the GLIMPSE point sources associated with the water masers are similar to those of 6.7-GHz methanol masers, but slightly less red. We have made a statistical investigation of the properties of the ¹³CO and 1.2-mm dust clumps with and without associated water masers. We find that the water masers are associated with the more massive, denser and brighter ¹³CO and 1.2-mm dust clumps. We present statistical models that are able to predict those ¹³CO and 1.2-mm dust clumps that are likely to have associated water masers, with a low misclassification rate.

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Detection table from Breen et al. (2007)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Other name	Image	Descr.	Line	V_range	V_peak	F_peak	Telescope	V_step	RMS	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)			Source number			H₂O	(km/s)	(km/s)	(Jy)		(km/s)	(Jy)	(arcsec)	Yes/No		(kpc)
1	16 19 43.6	-51 03 37.1	332.6532	-0.6215	G332.653-0.621	G 332.653-0.621	1	Image		22 GHz;	-59;-43	-45.3	28.9	ATCA	0.25	0.150	0.5	+H₂O +CH₃OH II	SFR_MIXED		2006 July
2	16 20 11.1	-50 53 16.1	332.8258	-0.5494	G332.825-0.549	G 332.826-0.549	2	Image	Descr	22 GHz;	-69;-45	-59.1	239.4	ATCA	0.25	0.150	0.5	+H₂O +OH			2006 July
3	16 20 58	-50 40 46.3	333.0602	-0.4886	G333.060-0.489	G 333.060-0.488	3	Image	Descr	22 GHz;	-13;5	-8.7	64.3	ATCA	0.25	0.150	0.5	+H₂O	EVOLVED		2006 July
4	16 20 59.8	-50 35 51.6	333.1213	-0.4338	G333.128-0.432	G 333.121-0.434	4	Image	Descr	22 GHz;	-60;-46	-57.7	161.1	ATCA	0.25	0.150	0.5	+H₂O +OH			2006 July
5	16 21 17.9	-50 30 18	333.2207	-0.4020	G333.221-0.402	G 333.221-0.402	5	Image	Descr	22 GHz;	-58;-48	-52	9.6	ATCA	0.25	0.150	0.5	+H₂O +CH₃OH I	SFR_MIXED		2006 July
6	16 21 30.4	-50 26 34	333.2881	-0.3813	G333.287-0.379	G 333.29-0.38	6	Image	Descr	22 GHz;	-51;-47	-49	7	ATCA	0.25	0.150	0.5	+H₂O +CH₃OH I	SFR		2005 June
7	16 21 44.3	-50 22 21.1	333.3639	-0.3577	G333.364-0.358	G 333.364-0.358	7	Image	Descr	22 GHz;	-55;-49	-52.6	3.2	ATCA	0.25	0.150	0.5	+H₂O	SFR		2006 July
8	16 22 7.5	-50 20 34.3	333.4285	-0.3804	G333.428-0.380	G 333.428-0.380	8	Image	Descr	22 GHz;	-6;6	4.1	12.4	ATCA	0.25	0.150	0.5	+H₂O	SFR		2006 July
9	16 22 11.1	-50 05 56	333.6078	-0.2147	G333.608-0.215	G 333.608-0.215	9	Image	Descr	22 GHz;	-64;-38	-49.2	103.3	ATCA	0.25	0.150	0.5	+H₂O +OH	SFR		2006 July

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
UKIDSS K Download UKIDSS K FITS	2MASS K Download 2MASS K FITS

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 'BRE07' 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 'BRE07' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

BRE07 - A search for 22-GHz water masers within the giant molecular cloud associated with RCW 106

View as list of objects

Detection table from Breen et al. (2007)