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LAZ02 - Accurate positions of H₂ O masers in the Large Magellanic Cloud

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Short title: Lazendic et al. (2002)
Authors: Lazendic, J. S.Whiteoak, J. B.Klamer, I.Harbison, P. D.Kuiper, T. B. H.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 331, Issue 4, pp. 969-974.
Bibcode:

Target type: HII,Extragalactic

Abstract
Positions with subarcsecond accuracy have been measured for seven 22-GHz H₂ O masers associated with Hii regions in the Large Magellanic Cloud (LMC) two of the masers are new detections. Initial position measurements were obtained with the 70-m antenna of the Canberra NASA Deep Space Network during a period of more than two years in which the antenna was used to monitor the maser emission. The positions were further improved using 22-GHz observations involving three antennas of the Australia Telescope Compact Array. The positions have been compared with those of 1.6-GHz continuum emission and other LMC masers (of OH and CH₃ OH). The H₂ O maser positions range from within 1arcsec (270mpc) of the centre of a compact Hii component to beyond the boundary of significant continuum emission. Three of the four masers located near continuum peaks are close to OH masers. In two cases the positional agreement is better than 0.2arcsec (53mpc) in the third case the agreement is worse (0.9arcsec) but the positions of the individual H₂ O features appear to be spread over more than 1arcsec. The velocities of the OH masers are within the spread of the H₂ O velocities. The three H₂ O masers offset from continuum centres are located 3-7arcsec from optical or infrared phenomena probably associated with very early stages of star formation no other molecular masers are known in these directions.

Abstract

Positions with subarcsecond accuracy have been measured for seven 22-GHz H₂ O masers associated with Hii regions in the Large Magellanic Cloud (LMC) two of the masers are new detections. Initial position measurements were obtained with the 70-m antenna of the Canberra NASA Deep Space Network during a period of more than two years in which the antenna was used to monitor the maser emission. The positions were further improved using 22-GHz observations involving three antennas of the Australia Telescope Compact Array. The positions have been compared with those of 1.6-GHz continuum emission and other LMC masers (of OH and CH₃ OH). The H₂ O maser positions range from within 1arcsec (270mpc) of the centre of a compact Hii component to beyond the boundary of significant continuum emission. Three of the four masers located near continuum peaks are close to OH masers. In two cases the positional agreement is better than 0.2arcsec (53mpc) in the third case the agreement is worse (0.9arcsec) but the positions of the individual H₂ O features appear to be spread over more than 1arcsec. The velocities of the OH masers are within the spread of the H₂ O velocities. The three H₂ O masers offset from continuum centres are located 3-7arcsec from optical or infrared phenomena probably associated with very early stages of star formation no other molecular masers are known in these directions.

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Detection table from Lazendic et al. (2002)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Source name	Image	Descr.	Line	V_range	V_peak	V_X	V_Y	Telescope	V_step	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						H₂O	(km/s)	(km/s)	(km/s)	(km/s)		(km/s)	Yes/No		(kpc)
1	+05 09 52.16	-68 53 28.6			279.752626	-34.251668	G279.753-34.252		MRC 0510 - 689	Image		22 GHz;	247;273	247;273			ATCA	0.13	+H₂O -CH₃OH I	SFR_MIXED		1996-1998
	+05 09 52.16	-68 53 28.6	1.2 mas	0.8 mas	279.752626	-34.251668		1	MRC 0510 - 689				247;273	247;273	A	A
2	+05 13 25.21	-69 22 45.9			280.239544	-33.832814	G280.236-33.837		(MC23; N105A) MRC 0513 - 694B	Image		22 GHz;	248;258	248;258			ATCA	0.13	+H₂O -CH₃OH II	SFR_MIXED		1996-1998
	+05 13 25.21	-69 22 45.9	-1.2 mas	1.2 mas	280.239544	-33.832814		1	(MC23; N105A) MRC 0513 - 694B				248;258	248;258	B	B
3	+05 13 17.67	-69 22 21.4			280.234525	-33.845118	G280.236-33.837		(MC24; N113)	Image	Descr	22 GHz;	249;252	249;252			ATCA	0.13	+H₂O -CH₃OH II	SFR_MIXED		1996-1998
	+05 13 17.67	-69 22 21.4	0 mas	-0.4 mas	280.234525	-33.845118		1	(MC24; N113)				249;252	249;252	C	C
4	+05 38 46.65	-69 04 45.5			279.439067	-31.668058	G279.439-31.668		MRC 0539 - 691	Image		22 GHz;	267;272	267;272			ATCA	0.13	+H₂O	SFR_MIXED		1996-1998
	+05 38 46.65	-69 04 45.5	0 mas	1.6 mas	279.439067	-31.668058		1	MRC 0539 - 691				267;272	267;272	D	D
5	+05 39 29.41	-69 47 18.9			280.257729	-31.523982	G280.258-31.524		(MC74; N157A) MRC 0540 - 697A	Image	Descr	22 GHz;	245;251	245;251			ATCA	0.13	+H₂O	SFR_MIXED		1996-1998
	+05 39 29.41	-69 47 18.9	-1.2 mas	-1.2 mas	280.257729	-31.523982		1	(MC74; N157A) MRC 0540 - 697A				245;251	245;251	E	E
6	+05 39 43.92	-69 38 33.6			280.084855	-31.52016	G280.098-31.526		(MC77; N159) MRC 0540 - 696B	Image	Descr	22 GHz;	245;261	245;261			ATCA	0.13	+H₂O	SFR_MIXED		1996-1998
	+05 39 43.92	-69 38 33.6	0 mas	1.2 mas	280.084855	-31.520160		1	(MC77; N159) MRC 0540 - 696B				245;261	245;261	F	F
7	+05 39 39.05	-69 39 10.8			280.097852	-31.525977	G280.098-31.526		(MC76; N160A)	Image	Descr	22 GHz;	251;255	251;255			ATCA	0.13	+H₂O	SFR_MIXED		1996-1998
	+05 39 39.05	-69 39 10.8	1.2 mas	0 mas	280.097852	-31.525977		1	(MC76; N160A)				251;255	251;255	G	G

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 'LAZ02' 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 'LAZ02' AND detected=true AND hide=false ORDER BY detected DESC,id

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LAZ02 - Accurate positions of H2 O masers in the Large Magellanic Cloud

Interferometry data

View as list of objects

Detection table from Lazendic et al. (2002)

LAZ02 - Accurate positions of H₂ O masers in the Large Magellanic Cloud