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BUR14 - VLBI observations of H₂O maser annual parallax and proper motion in IRAS 20143+3634: Reflection on the Galactic constants

Interferometry data

Short title: Burns et al. (2014)
Authors: Burns, Ross A.Yamaguchi, YoshiyukiHanda, ToshihiroOmodaka, ToshihiroNagayama, TakumiNakagawa, AkiharuHayashi, MasahikoKamezaki, TatsuyaChibueze, James O.Shizugami, MakotoNakano, Makoto
Journal: Publications of the Astronomical Society of Japan, Volume 66, Issue 6, id.102 10 pp.
Bibcode:

Target type: High_mass_SFR

Abstract
We report the results of very long baseline interferometry (VLBI) observations of H2O masers in the IRAS 20143+3634 star-forming region (SFR) using VERA (VLBI Exploration of Radio Astrometry). By tracking masers for a period of over two years we measured a trigonometric parallax of π = 0.367 � 0.037 mas, corresponding to a source distance of D = 2.72 ^{+0.31}_{-0.25} kpc and placing it in the Local spiral arm. Our trigonometric distance is just 60% of the previous estimation based on radial velocity, significantly impacting the astrophysics of the source. We measured proper motions of -2.99 � 0.16 mas yr-1 and -4.37 � 0.43 mas yr-1 in RA and Dec, respectively, which were used to estimate the peculiar motion of the source as (Us, Vs, Ws) = (-0.9 � 2.9, -8.5 � 1.6, +8.0 � 4.3) km s-1 for R0 = 8 kpc and Θ0 = 221 km s-1, and (Us, Vs, Ws) = (-1.0 � 2.9, -9.3 � 1.5, +8.0 � 4.3) km s-1 for R0 = 8.5 kpc and Θ0 = 235 km s-1. IRAS 20143+3634 was found to be located near the tangent point in the Cygnus direction. Using our observations we derived the angular velocity of Galactic rotation of the local standard of rest (LSR), Ω0 = 27.3 � 1.6 km s-1 kpc-1, which is consistent with previous values derived using VLBI astrometry of SFRs at the tangent points and Solar circle. It is higher than the value recommended by the International Astronomical Union of Ω0 = 25.9 km s-1 kpc-1 which was calculated using the Galactocentric distance of the Sun and circular velocity of the LSR.

Abstract

We report the results of very long baseline interferometry (VLBI) observations of H2O masers in the IRAS 20143+3634 star-forming region (SFR) using VERA (VLBI Exploration of Radio Astrometry). By tracking masers for a period of over two years we measured a trigonometric parallax of π = 0.367 � 0.037 mas, corresponding to a source distance of D = 2.72 ^{+0.31}_{-0.25} kpc and placing it in the Local spiral arm. Our trigonometric distance is just 60% of the previous estimation based on radial velocity, significantly impacting the astrophysics of the source. We measured proper motions of -2.99 � 0.16 mas yr-1 and -4.37 � 0.43 mas yr-1 in RA and Dec, respectively, which were used to estimate the peculiar motion of the source as (Us, Vs, Ws) = (-0.9 � 2.9, -8.5 � 1.6, +8.0 � 4.3) km s-1 for R0 = 8 kpc and Θ0 = 221 km s-1, and (Us, Vs, Ws) = (-1.0 � 2.9, -9.3 � 1.5, +8.0 � 4.3) km s-1 for R0 = 8.5 kpc and Θ0 = 235 km s-1. IRAS 20143+3634 was found to be located near the tangent point in the Cygnus direction. Using our observations we derived the angular velocity of Galactic rotation of the local standard of rest (LSR), Ω0 = 27.3 � 1.6 km s-1 kpc-1, which is consistent with previous values derived using VLBI astrometry of SFRs at the tangent points and Solar circle. It is higher than the value recommended by the International Astronomical Union of Ω0 = 25.9 km s-1 kpc-1 which was calculated using the Galactocentric distance of the Sun and circular velocity of the LSR.

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Detection table from Burns et al. (2014)

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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	π	Epoch	Telescope	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)							H₂O	(km/s)	(mas/yr)	(mas/yr)	(mas)	#		Yes/No		(kpc)
1	+20 16 13.3617	+36 43 33.92			74.5695885	0.8457681	G74.563+0.850			IRAS 20143+3634	Image	Descr	22 GHz;	0.5					VERA	+H₂O -CH₃OH II	EVOLVED	2.72 (-0.25 +0.31)	2008 Dec - 2010 Dec
	+20 16 13.3467033	+36 43 33.64537	-225.13 mas	-274.67 mas	74.569497	0.845767		1	1	IRAS 20143+3634				-9.47				****67
	+20 16 13.3503907	+36 43 33.66987	-169.82 mas	-250.17 mas	74.569510	0.845761		2	2	IRAS 20143+3634				6.53				3***
	+20 16 13.3503913	+36 43 33.66992	-169.81 mas	-250.12 mas	74.569510	0.845761		3	2	IRAS 20143+3634				5.68				23****
	+20 16 13.350396	+36 43 33.66985	-169.74 mas	-250.19 mas	74.569510	0.845761		4	2	IRAS 20143+3634				6.10				23****
	+20 16 13.359772	+36 43 33.93629	-29.1 mas	16.25 mas	74.569589	0.845776		5	3	IRAS 20143+3634				-1.47				*45*
	+20 16 13.3597847	+36 43 33.93677	-28.91 mas	16.73 mas	74.569589	0.845776		6	3	IRAS 20143+3634				-1.05	-3.50 (0.25)	-2.90 (0.57)		2345**
	+20 16 13.3597847	+36 43 33.93629	-28.91 mas	16.25 mas	74.569589	0.845776		7	3	IRAS 20143+3634				-0.63				*45*
	+20 16 13.359854	+36 43 33.93585	-27.87 mas	15.81 mas	74.569589	0.845776		8	3	IRAS 20143+3634				-0.63				23****
	+20 16 13.360072	+36 43 33.93116	-24.6 mas	11.12 mas	74.569588	0.845774		9	4	IRAS 20143+3634				-1.89	-3.03 (0.19)	-4.78 (0.46)	0.343 (0.094)	****5678
	+20 16 13.360244	+36 43 33.93662	-22.02 mas	16.58 mas	74.569590	0.845775		10	5	IRAS 20143+3634				-1.05	-2.35 (0.38)	-5.31 (0.87)		*****678
	+20 16 13.3602547	+36 43 33.93668	-21.86 mas	16.64 mas	74.569590	0.845775		11	5	IRAS 20143+3634				-1.47	-2.50 (0.38)	-5.32 (0.87)		*****678
	+20 16 13.3603027	+36 43 33.93598	-21.14 mas	15.94 mas	74.569590	0.845774		12	5	IRAS 20143+3634				-2.31	-3.26 (0.26)	-4.45 (0.61)		***567
	+20 16 13.361712	+36 43 33.92004	0 mas	0 mas	74.569589	0.845768		13	5 avg	IRAS 20143+3634				-1.61	-2.70 (0.23)	-5.03 (0.24)
	+20 16 13.3603287	+36 43 33.9354	-20.75 mas	15.36 mas	74.569590	0.845774		14	6	IRAS 20143+3634				-1.47				23****
	+20 16 13.3610967	+36 43 33.93007	-9.23 mas	10.03 mas	74.569590	0.845771		15	7	IRAS 20143+3634				-0.63				****67
	+20 16 13.36112	+36 43 33.93102	-8.88 mas	10.98 mas	74.569590	0.845771		16	7	IRAS 20143+3634				-0.21				****67
	+20 16 13.36171	+36 43 33.92074	-0.0300001 mas	0.7 mas	74.569589	0.845768		17	8	IRAS 20143+3634				1.05	-2.71 (0.14)	-5.16 (0.34)	0.399 (0.084)	***45678
	+20 16 13.3617067	+36 43 33.92074	-0.0799999 mas	0.7 mas	74.569589	0.845768		18	8	IRAS 20143+3634				0.63	-2.75 (0.09)	-4.49 (0.21)	0.379 (0.073)	*2345678
	+20 16 13.3617067	+36 43 33.9207	-0.0799999 mas	0.66 mas	74.569589	0.845768		19	8	IRAS 20143+3634				-0.21	-2.67 (0.11)	-4.88 (0.27)	0.252 (0.178)	*34578
	+20 16 13.361712	+36 43 33.92004	0 mas	0 mas	74.569589	0.845768		20	8	IRAS 20143+3634				0.21	-2.73 (0.08)	-4.49 (0.21)	0.430 (0.074)	12345678
	+20 16 13.361712	+36 43 33.92004	0 mas	0 mas	74.569589	0.845768		21	8 avg	IRAS 20143+3634				0.42	-2.72 (0.01)	-4.76 (0.14)

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 'BUR14' 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 'BUR14' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

BUR14 - VLBI observations of H2O maser annual parallax and proper motion in IRAS 20143+3634: Reflection on the Galactic constants

Interferometry data

View as list of objects

Detection table from Burns et al. (2014)

BUR14 - VLBI observations of H₂O maser annual parallax and proper motion in IRAS 20143+3634: Reflection on the Galactic constants