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CHI14B - Astrometry and Spatio-kinematics of H₂O Masers in the Massive Star-forming Region NGC 6334I(North) with VERA

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Short title: Chibueze et al. (2014b)
Authors: Chibueze, James O.Omodaka, ToshihiroHanda, ToshihiroImai, HiroshiKurayama, TomoharuNagayama, TakumiSunada, KazuyoshiNakano, MakotoHirota, TomoyaHonma, Mareki
Journal: The Astrophysical Journal, Volume 784, Issue 2, article id. 114, 8 pp. (2014).
Bibcode:

Target type: High_mass_SFR

Abstract
We measured the trigonometric parallax of an H2O maser source associated with the massive star-forming region NGC 6334I(North), hereafter as NGC 6334I(N), with the VLBI Exploration of Radio Astrometry. The derived annual parallax is 0.789 � 0.161 mas, corresponding to a distance of 1.26^{+0.33}_{-0.21} kpc. Using the new distance, we recalculated the physical parameters (masses and luminosities) of the dust continuum cores in the region, and the revised parameters are only ~50% of their originally reported values. We also traced 23 relative proper motions of the H2O masers associated with SMA1 (central millimeter source in the region) between epochs, which exhibit an average amplitude of maser proper motion of ~2.03 mas yr-1 (~12.22 km s-1), tracing a bipolar outflow. The bipolar outflow structure extends through ~600 mas (~720 AU), with a dynamical timescale of ~295 yr. Using an expanding flow model, we derived the most plausible dynamical center of the outflow, pointing to SMA1b (1.3 cm and 7 mm continuum source) as the outflow driving source. Based on our results and other existing parallax results, we derive the pitch angles of the Sagittarius arm as 6.�2 � 5.�4 along the Galactic longitude range of ~0.�7 - ~40.�1 assuming a perfect logarithmic spiral. We derived the peculiar motion of NGC 6334I(N) to be -4 � 1 km s-1 toward the Galactic center, 8 � 2 km s-1 in the direction of the Galactic rotation, and 25 � 2 km s-1 toward the Galactic north pole.

Abstract

We measured the trigonometric parallax of an H2O maser source associated with the massive star-forming region NGC 6334I(North), hereafter as NGC 6334I(N), with the VLBI Exploration of Radio Astrometry. The derived annual parallax is 0.789 � 0.161 mas, corresponding to a distance of 1.26^{+0.33}_{-0.21} kpc. Using the new distance, we recalculated the physical parameters (masses and luminosities) of the dust continuum cores in the region, and the revised parameters are only ~50% of their originally reported values. We also traced 23 relative proper motions of the H2O masers associated with SMA1 (central millimeter source in the region) between epochs, which exhibit an average amplitude of maser proper motion of ~2.03 mas yr-1 (~12.22 km s-1), tracing a bipolar outflow. The bipolar outflow structure extends through ~600 mas (~720 AU), with a dynamical timescale of ~295 yr. Using an expanding flow model, we derived the most plausible dynamical center of the outflow, pointing to SMA1b (1.3 cm and 7 mm continuum source) as the outflow driving source. Based on our results and other existing parallax results, we derive the pitch angles of the Sagittarius arm as 6.�2 � 5.�4 along the Galactic longitude range of ~0.�7 - ~40.�1 assuming a perfect logarithmic spiral. We derived the peculiar motion of NGC 6334I(N) to be -4 � 1 km s-1 toward the Galactic center, 8 � 2 km s-1 in the direction of the Galactic rotation, and 25 � 2 km s-1 toward the Galactic north pole.

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Detection table from Chibueze et al. (2014b)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Maser spot	Source name	Image	Descr.	Line	V_peak	μ_X	μ_Y	Telescope	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)							H₂O	(km/s)	(mas/yr)	(mas/yr)		Yes/No		(kpc)
1	+17 20 55.1909	-35 45 3.7987			351.44718	0.6587871	G351.446+0.660			NGC 6334I	Image	Descr	22 GHz;				JVN	+H₂O +CH₃OH I +CH₃OH II +OH	SFR	1.26 (-0.21 +0.33)	2010 February 6 - 2012 April 6
	+17 20 55.1920487	-35 45 3.76846	17.17 mas	30.26 mas	351.447189	0.658789		1	1	NGC 6334I				-28.96	-1.41 (3.48)	0.26 (4.25)
	+17 20 55.19205	-35 45 3.76731	17.19 mas	31.41 mas	351.447189	0.658789		2	2	NGC 6334I				-25.67	3.82 (1.87)	1.00 (4.20)
	+17 20 55.194472	-35 45 3.99004	53.52 mas	-191.32 mas	351.447143	0.658747		3	3	NGC 6334I				-23.47	3.85 (0.28)	-0.53 (0.99)
	+17 20 55.1921253	-35 45 3.76487	18.32 mas	33.85 mas	351.447190	0.658789		4	4	NGC 6334I				-21.08	2.93 (1.95)	8.57 (4.83)
	+17 20 55.1922453	-35 45 3.76579	20.12 mas	32.93 mas	351.447190	0.658789		5	5	NGC 6334I				-19.68	4.98 (2.97)	10.81 (5.19)
	+17 20 55.1946373	-35 45 3.98503	56 mas	-186.31 mas	351.447145	0.658747		6	6	NGC 6334I				-18.29	0.54 (1.38)	-7.13 (3.17)
	+17 20 55.19569	-35 45 3.73387	71.79 mas	64.85 mas	351.447204	0.658784		7	7	NGC 6334I				-12.81	1.48 (1.62)	6.67 (3.19)
	+17 20 55.19127	-35 45 3.78946	5.49 mas	9.26 mas	351.447183	0.658788		8	8	NGC 6334I				-12.32	0.85 (0.39)	2.81 (0.67)
	+17 20 55.1887487	-35 45 3.56522	-32.33 mas	233.5 mas	351.447229	0.658830		9	9	NGC 6334I				-12.05	0.53 (1.48)	8.45 (3.45)
	+17 20 55.190892	-35 45 3.7961	-0.18 mas	2.62 mas	351.447181	0.658788		10	10	NGC 6334I				-11.76	1.11 (0.05)	-1.14 (0.07)
	+17 20 55.190904	-35 45 3.79872	0 mas	0 mas	351.447180	0.658787		11	11	NGC 6334I				-11.32	0.00 (0.47)	0.00 (0.53)
	+17 20 55.190904	-35 45 3.79871	0 mas	0.01 mas	351.447180	0.658787		12	12	NGC 6334I				-10.18	-0.73 (0.05)	-3.39 (0.28)
	+17 20 55.1892427	-35 45 3.83829	-24.92 mas	-39.57 mas	351.447168	0.658785		13	13	NGC 6334I				-9.86	-1.35 (1.66)	-1.77 (0.74)
	+17 20 55.192976	-35 45 4.12294	31.08 mas	-324.22 mas	351.447110	0.658730		14	14	NGC 6334I				-8.81	9.37 (0.22)	-3.04 (1.41)
	+17 20 55.1867707	-35 45 3.89618	-62 mas	-97.46 mas	351.447150	0.658783		15	15	NGC 6334I				-8.32	-2.69 (1.53)	-14.65 (4.35)
	+17 20 55.1891147	-35 45 3.83297	-26.84 mas	-34.25 mas	351.447169	0.658787		16	16	NGC 6334I				-6.91	7.40 (0.19)	4.22 (0.60)
	+17 20 55.1906033	-35 45 3.90467	-4.51 mas	-105.95 mas	351.447155	0.658771		17	17	NGC 6334I				-4.82	1.58 (2.84)	-12.15 (5.53)
	+17 20 55.1906267	-35 45 3.9106	-4.16 mas	-111.88 mas	351.447154	0.658770		18	18	NGC 6334I				-1.37	-5.59 (2.94)	-2.28 (8.39)
	+17 20 55.1905527	-35 45 3.90765	-5.27 mas	-108.93 mas	351.447154	0.658771		19	19	NGC 6334I				-0.58	-0.81 (2.82)	-3.51 (6.80)
	+17 20 55.1857513	-35 45 3.88688	-77.29 mas	-88.16 mas	351.447150	0.658787		20	20	NGC 6334I				1.16	-5.71 (1.52)	-2.91 (4.04)
	+17 20 55.190362	-35 45 3.91174	-8.13 mas	-113.02 mas	351.447153	0.658771		21	21	NGC 6334I				7.28	-1.51 (3.67)	-11.40 (6.17)
	+17 20 55.1904673	-35 45 3.91042	-6.55 mas	-111.7 mas	351.447154	0.658771		22	22	NGC 6334I				9.77	-3.19 (2.01)	-11.48 (4.40)
	+17 20 55.1892173	-35 45 3.90703	-25.3 mas	-108.31 mas	351.447152	0.658775		23	23	NGC 6334I				14.66	-2.09 (2.86)	-12.22 (4.95)

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(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 'CHI14B' 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 'CHI14B' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

CHI14B - Astrometry and Spatio-kinematics of H2O Masers in the Massive Star-forming Region NGC 6334I(North) with VERA

Interferometry data

View as list of objects

Detection table from Chibueze et al. (2014b)

CHI14B - Astrometry and Spatio-kinematics of H₂O Masers in the Massive Star-forming Region NGC 6334I(North) with VERA