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YAM16 - The far distance to G7.47+0.06 from proper motion measurement of H₂O masers

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Short title: Yamauchi et al. (2016)
Authors: Yamauchi, AyaYamashita, KazuyoshiHonma, MarekiSunada, KazuyoshiNakagawa, AkiharuUeno, Yuji
Journal: Publications of the Astronomical Society of Japan, Volume 68, Issue 4, id.60 12 pp.
Bibcode:

Target type: High_mass_SFR

Abstract
We report on a distance measurement of 22 GHz H2O maser features associated with an ultra-compact H II region G7.47+0.06 using VERA (VLBI Exploration of Radio Astrometry). Since the source is located farther away than 10 kpc, it turned out to be difficult to derive the distance from annual parallax measurement. Meanwhile, we clearly detected the source's proper motion parallel to the Galactic plane. The proper motion is μ = -5.03 � 0.07 mas yr-1 and is approaching the Galactic center. We applied a new method to determine the source distance based on absolute proper motions. Considering uncertainties of the Galactic rotation curve and the solar peculiar motion, the detected proper motion leads to a source distance of D = 20 � 2 kpc, demonstrating that astrometric observation can provide an accurate distance measurement at a 10% level even for sources too distant to measure the annual parallax. Lastly, we scale the physical parameters of the H II region estimated in a previous paper to be 20 kpc, and show that the H2O maser features are associated with a massive star-forming region corresponding to the spectral type of O5.5.

Abstract

We report on a distance measurement of 22 GHz H2O maser features associated with an ultra-compact H II region G7.47+0.06 using VERA (VLBI Exploration of Radio Astrometry). Since the source is located farther away than 10 kpc, it turned out to be difficult to derive the distance from annual parallax measurement. Meanwhile, we clearly detected the source's proper motion parallel to the Galactic plane. The proper motion is μ = -5.03 � 0.07 mas yr-1 and is approaching the Galactic center. We applied a new method to determine the source distance based on absolute proper motions. Considering uncertainties of the Galactic rotation curve and the solar peculiar motion, the detected proper motion leads to a source distance of D = 20 � 2 kpc, demonstrating that astrometric observation can provide an accurate distance measurement at a 10% level even for sources too distant to measure the annual parallax. Lastly, we scale the physical parameters of the H II region estimated in a previous paper to be 20 kpc, and show that the H2O maser features are associated with a massive star-forming region corresponding to the spectral type of O5.5.

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Detection table from Yamauchi et al. (2016)

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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	F_peak	Epoch	Telescope	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)							H₂O	(km/s)	(Jy/beam)	#		Yes/No		(kpc)
1	+18 02 13.179	-22 27 58.96			7.470694	0.0583785	G7.470+0.060			G7.47+0.06	Image	Descr	22 GHz;	-16.79	6.29		VERA	+H₂O -CH₃OH I -CH₃OH II	SFR	20 (2)	2009 Mar - 2011 Dec
	+18 02 13.1823	-22 27 58.95736	49.5 mas	2.72 mas	7.470701	0.058368		1	1	G7.47+0.06				-17.04	3.78	2009/062
	+18 02 13.1820413	-22 27 58.96195	45.62 mas	-1.87 mas	7.470699	0.058368		2	2	G7.47+0.06				-16.32	1.69
	+18 02 13.1826173	-22 27 58.95569	54.26 mas	4.39 mas	7.470702	0.058367		3	3	G7.47+0.06				-15.90	2.73
	+18 02 13.182242	-22 27 58.95816	48.63 mas	1.92 mas	7.470701	0.058368		4	1	G7.47+0.06				-16.79	6.29	2009/136
	+18 02 13.1819653	-22 27 58.96258	44.48 mas	-2.5 mas	7.470699	0.058368		5	2	G7.47+0.06				-16.03	3.72
	+18 02 13.1825573	-22 27 58.95643	53.36 mas	3.65 mas	7.470702	0.058367		6	3	G7.47+0.06				-15.66	4.13
	+18 02 13.1822347	-22 27 58.95967	48.52 mas	0.41 mas	7.470700	0.058368		7	1	G7.47+0.06				-16.63	4.02	2009/239
	+18 02 13.18215	-22 27 58.96153	47.25 mas	-1.45 mas	7.470700	0.058368		8	1	G7.47+0.06				-16.83	3.89	2010/009
	+18 02 13.1818813	-22 27 58.9661	43.22 mas	-6.02 mas	7.470698	0.058368		9	2	G7.47+0.06				-16.11	3.61
	+18 02 13.1824707	-22 27 58.95982	52.06 mas	0.26 mas	7.470701	0.058367		10	3	G7.47+0.06				-15.61	4.00
	+18 02 13.1857387	-22 27 59.01059	101.08 mas	-50.51 mas	7.470695	0.058349		11	4	G7.47+0.06				-13.69	2.22
	+18 02 13.18211	-22 27 58.9627	46.65 mas	-2.62 mas	7.470699	0.058368		12	1	G7.47+0.06				-16.97	2.84	2010/151
	+18 02 13.1818307	-22 27 58.96754	42.46 mas	-7.46 mas	7.470698	0.058368		13	2	G7.47+0.06				-16.32	5.21
	+18 02 13.1824293	-22 27 58.96086	51.44 mas	-0.78 mas	7.470700	0.058367		14	3	G7.47+0.06				-15.82	4.39
	+18 02 13.185692	-22 27 59.0119	100.38 mas	-51.82 mas	7.470694	0.058349		15	4	G7.47+0.06				-14.09	1.78
	+18 02 13.1819467	-22 27 58.96711	44.2 mas	-7.03 mas	7.470698	0.058368		16	1	G7.47+0.06				-17.16	3.10	2011/128
	+18 02 13.181666	-22 27 58.97178	39.99 mas	-11.7 mas	7.470696	0.058368		17	2	G7.47+0.06				-16.16	4.97
	+18 02 13.1822693	-22 27 58.96539	49.04 mas	-5.31 mas	7.470699	0.058367		18	3	G7.47+0.06				-15.87	4.11
	+18 02 13.1815753	-22 27 58.97313	38.63 mas	-13.05 mas	7.470696	0.058368		19	2	G7.47+0.06				-16.37	4.75	2011/255
	+18 02 13.182166	-22 27 58.96613	47.49 mas	-6.05 mas	7.470699	0.058367		20	3	G7.47+0.06				-15.48	1.81

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 'YAM16' 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 'YAM16' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

YAM16 - The far distance to G7.47+0.06 from proper motion measurement of H2O masers

Interferometry data

View as list of objects

Detection table from Yamauchi et al. (2016)

YAM16 - The far distance to G7.47+0.06 from proper motion measurement of H₂O masers