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SAT10 - Distance to G14.33-0.64 in the Sagittarius Spiral Arm: H₂O Maser Trigonometric Parallax with VERA

Interferometry data

Short title: Sato et al. (2010)
Authors: Sato, MayumiHirota, TomoyaReid, Mark J.Honma, MarekiKobayashi, HideyukiIwadate, KenzaburoMiyaji, TakeshiShibata, Katsunori M.
Journal: Publications of the Astronomical Society of Japan, Vol.62, No.2, pp.287--299
Bibcode:

Target type: High_mass_SFR

Abstract
We report on trigonometric parallax measurements for the Galactic star-forming region G14.33�0.64 toward the Sagittarius spiral arm. We conducted multi-epoch phase-referencing observations of an H2O maser source in G14.33�0.64 with the Japanese VLBI array VERA. We successfully detected a parallax of n = 0.893 � 0.101 mas, corresponding to a source distance of d = 1.12 � 0.13 kpc, which is less than half of the kinematic distance for G14.33-0.64. Our new distance measurement demonstrates that the Sagittarius arm lies at a closer distance of ~ 1 kpc, instead of the previously assumed ~ 2-3 kpc from the kinematic distances. The previously suggested deviation of the Sagittarius arm toward the Galactic center from the symmetrically fitted model (Taylor & Cordes 1993, ApJ, 411,674) is likely due to large errors of the kinematic distances at low galactic longitudes. G14.33-0.64 most likely traces the near side of the Sagittarius arm. We attempted to fit the pitch angle of the arm with other parallax measurements along the arm, which yielded two possible pitch angles of i = 34 .�7 � 2 .�7 and i = 11.�2 � 10 75. Our proper-motion measurements suggest that G14.33�0.64 has no significant peculiar motion relative to the differential rotation of the Galaxy (assumed to be in a circular orbit), indicating that the source motion is in good agreement with the Galactic rotation.

Abstract

We report on trigonometric parallax measurements for the Galactic star-forming region G14.33�0.64 toward the Sagittarius spiral arm. We conducted multi-epoch phase-referencing observations of an H2O maser source in G14.33�0.64 with the Japanese VLBI array VERA. We successfully detected a parallax of n = 0.893 � 0.101 mas, corresponding to a source distance of d = 1.12 � 0.13 kpc, which is less than half of the kinematic distance for G14.33-0.64. Our new distance measurement demonstrates that the Sagittarius arm lies at a closer distance of ~ 1 kpc, instead of the previously assumed ~ 2-3 kpc from the kinematic distances. The previously suggested deviation of the Sagittarius arm toward the Galactic center from the symmetrically fitted model (Taylor & Cordes 1993, ApJ, 411,674) is likely due to large errors of the kinematic distances at low galactic longitudes. G14.33-0.64 most likely traces the near side of the Sagittarius arm. We attempted to fit the pitch angle of the arm with other parallax measurements along the arm, which yielded two possible pitch angles of i = 34 .�7 � 2 .�7 and i = 11.�2 � 10 75. Our proper-motion measurements suggest that G14.33�0.64 has no significant peculiar motion relative to the differential rotation of the Galaxy (assumed to be in a circular orbit), indicating that the source motion is in good agreement with the Galactic rotation.

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Detection table from Sato et al. (2010)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	#	Source name	Image	Descr.	Line	V_peak	μ_X	μ_Y	F_peak	Telescope	V_step	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						H₂O	(km/s)	(mas/yr)	(mas/yr)	(Jy)		(km/s)	(arcsec)	Yes/No		(kpc)
1	+18 18 53.8	-16 47 50			14.3302238	-0.6418839	G14.332-0.642		G14.33-0.64	Image	Descr	22 GHz;	26			70	VERA	0.21	0.00224 x 0.00092	+H₂O +CH₃OH I +CH₃OH II	SFR	1.12 (0.13)	2006 Oct - 2008 Jul
	+18 18 53.820188	-16 47 50.19912	302.7 mas	-199.2 mas	14.330213	-0.641981		1	G14.33-0.64				12.5	7.05 (0.16)	-3.69 (0.39)
	+18 18 53.8201947	-16 47 50.19922	302.8 mas	-199.3 mas	14.330213	-0.641981		2	G14.33-0.64				12.7	7.08 (0.19)	-3.59 (0.11)
	+18 18 53.8202013	-16 47 50.19902	302.9 mas	-199.1 mas	14.330213	-0.641981		3	G14.33-0.64				12.9	6.63 (0.10)	-3.70 (0.38)
	+18 18 53.8201947	-16 47 50.19892	302.8 mas	-199 mas	14.330213	-0.641981		4	G14.33-0.64				13.2	7.04 (0.23)	-4.15 (0.14)
	+18 18 53.820208	-16 47 50.19892	303 mas	-199 mas	14.330213	-0.641981		5	G14.33-0.64				13.4	6.53 (0.02)	-3.86 (0.03)
	+18 18 53.8202213	-16 47 50.19802	303.2 mas	-198.1 mas	14.330214	-0.641981		6	G14.33-0.64				14.2	6.31 (0.41)	-6.46(1.93)
	+18 18 53.8202213	-16 47 50.19802	303.2 mas	-198.1 mas	14.330214	-0.641981		7	G14.33-0.64				14.4	6.22 (0.29)	-6.65 (1.83)
	+18 18 53.820208	-16 47 50.19872	303 mas	-198.8 mas	14.330213	-0.641981		8	G14.33-0.64				14.6	6.70 (0.53)	-5.11 (2.01)
	+18 18 53.8202147	-16 47 50.19872	303.1 mas	-198.8 mas	14.330213	-0.641981		9	G14.33-0.64				14.8	6.66 (0.23)	-4.22 (0.85)
	+18 18 53.8202013	-16 47 50.19922	302.9 mas	-199.3 mas	14.330213	-0.641981		10	G14.33-0.64				15	7.33 (0.06)	-2.14 (0.13)
	+18 18 53.8124947	-16 47 50.13402	187.3 mas	-134.1 mas	14.330215	-0.641945		11	G14.33-0.64				17.6	2.23 (0.23)	-3.69 (0.19)
	+18 18 53.8124947	-16 47 50.13412	187.3 mas	-134.2 mas	14.330215	-0.641945		12	G14.33-0.64				17.8	2.12 (0.09)	-3.64 (0.10)
	+18 18 53.8125013	-16 47 50.13412	187.4 mas	-134.2 mas	14.330215	-0.641945		13	G14.33-0.64				18	2.05 (0.19)	-4.06 (0.26)
	+18 18 53.8125013	-16 47 50.13412	187.4 mas	-134.2 mas	14.330215	-0.641945		14	G14.33-0.64				18.2	1.41 (0.46)	-3.43 (0.28)
	+18 18 53.8122547	-16 47 50.12932	183.7 mas	-129.4 mas	14.330215	-0.641944		15	G14.33-0.64				18	-0.14(0.39)	-1.57 (0.45)
	+18 18 53.8122547	-16 47 50.12942	183.7 mas	-129.5 mas	14.330215	-0.641944		16	G14.33-0.64				18.2	-0.35 (0.23)	-0.75 (0.18)
	+18 18 53.8122613	-16 47 50.12952	183.8 mas	-129.6 mas	14.330215	-0.641944		17	G14.33-0.64				18.4	-0.57 (0.47)	-0.42 (0.69)
	+18 18 53.812268	-16 47 50.12972	183.9 mas	-129.8 mas	14.330215	-0.641944		18	G14.33-0.64				18.6	-0.90 (0.28)	0.18 (0.80)
	+18 18 53.8000147	-16 47 50.00002	0.1 mas	-0.1 mas	14.330224	-0.641884		19	G14.33-0.64				20.9	-0.07 (0.05)	-0.17 (0.16)
	+18 18 53.800008	-16 47 50.00002	0 mas	-0.1 mas	14.330224	-0.641884		20	G14.33-0.64				21.2	-0.03 (0.02)	-0.14 (0.07)
	+18 18 53.800008	-16 47 49.99992	0 mas	0 mas	14.330224	-0.641884		21	G14.33-0.64				21.4	0.07 (0.03)	0.02 (0.05)
	+18 18 53.800008	-16 47 49.99992	0 mas	0 mas	14.330224	-0.641884		22	G14.33-0.64				21.8	-0.01 (0.01)	0.03 (0.07)
	+18 18 53.8000013	-16 47 49.99992	-0.1 mas	0 mas	14.330224	-0.641884		23	G14.33-0.64				22	0.09(0.07)	0.04 (0.07)
	+18 18 53.8000013	-16 47 49.99982	-0.1 mas	0.1 mas	14.330224	-0.641884		24	G14.33-0.64				22.2	0.33 (0.19)	-0.27 (0.27)
	+18 18 53.799988	-16 47 49.99682	-0.3 mas	3.1 mas	14.330225	-0.641883		25	G14.33-0.64				21.6	0.50(0.16)	0.61 (0.25)
	+18 18 53.7999947	-16 47 49.99692	-0.2 mas	3 mas	14.330225	-0.641883		26	G14.33-0.64				21.8	0.22 (0.03)	0.75 (0.08)
	+18 18 53.799988	-16 47 49.99682	-0.3 mas	3.1 mas	14.330225	-0.641883		27	G14.33-0.64				22	0.32 (0.10)	0.63 (0.08)
	+18 18 53.8000013	-16 47 49.99672	-0.1 mas	3.2 mas	14.330225	-0.641883		28	G14.33-0.64				22.2	-0.11 (0.19)	0.61 (0.14)
	+18 18 53.800008	-16 47 49.99652	0 mas	3.4 mas	14.330225	-0.641883		29	G14.33-0.64				22.4	0.11 (0.12)	-0.13 (0.64)
	+18 18 53.800008	-16 47 50.01592	0 mas	-16 mas	14.330220	-0.641886		30	G14.33-0.64				22.6	0.73 (0.14)	-1.33 (0.01)
	+18 18 53.8000147	-16 47 50.01592	0.1 mas	-16 mas	14.330220	-0.641886		31	G14.33-0.64				22.8	0.10(0.09)	-1.44(0.08)
	+18 18 53.800008	-16 47 50.01592	0 mas	-16 mas	14.330220	-0.641886		32	G14.33-0.64				23.1	0.19(0.02)	-1.26(0.05)
	+18 18 53.800008	-16 47 50.01582	0 mas	-15.9 mas	14.330220	-0.641886		33	G14.33-0.64				23.3	0.25 (0.01)	-1.43 (0.12)
	+18 18 53.800008	-16 47 50.01582	0 mas	-15.9 mas	14.330220	-0.641886		34	G14.33-0.64				23.5	0.17 (0.05)	-1.24(0.07)
	+18 18 53.800008	-16 47 50.01572	0 mas	-15.8 mas	14.330220	-0.641886		35	G14.33-0.64				23.7	0.30(0.12)	-1.45 (0.10)
	+18 18 53.4793413	-16 47 49.68092	-4810 mas	319 mas	14.329697	-0.640715		36	G14.33-0.64				26			70

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 'SAT10' 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 'SAT10' AND detected=true AND hide=false ORDER BY detected DESC,id

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SAT10 - Distance to G14.33-0.64 in the Sagittarius Spiral Arm: H2O Maser Trigonometric Parallax with VERA

Interferometry data

View as list of objects

Detection table from Sato et al. (2010)

SAT10 - Distance to G14.33-0.64 in the Sagittarius Spiral Arm: H₂O Maser Trigonometric Parallax with VERA