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IMA07 - Astrometry of H₂O Masers in Nearby Star-Forming Regions with VERA I. IRAS 16293-2422 in Ï Oph East

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Short title: Imai et al. (2007)
Authors: Imai, HiroshiNakashima, KohichiroBushimata, TakeshiChoi, Yoon KyungHirota, TomoyaHonma, MarekiHoriai, KojiInomata, NoritomoIwadate, KenzaburoJike, TakaakiKameya, OsamuKamohara, RyuichiKan-Ya, YukitoshiKawaguchi, NoriyukiKijima, MasachikaKobayashi, HideyukiKuji, SeisukeKurayama, TomoharuManabe, SeijiMiyaji, TakeshiNagayama, TakumiNakagawa, AkiharuOh, Chung SikOmodaka, ToshihiroOyama, TomoakiSakai, SatoshiSakakibara, SeiichiroSato, KatsuhisaSasao, TetsuoShibata, Katsunori M.Shimizu, RieShintani, MotonobuSofue, YoshiakiSora, KasumiSuda, HiroshiTamura, YoshiakiTsushima, MiyukiUeno, YujiYamashita, Kazuyoshi
Journal: Publications of the Astronomical Society of Japan, Vol.59, No.6, pp.1107--1113
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Target type: Low_mass_SFR

Abstract
We report on results of multi-epoch VLBI observations of H2O masers associated with a low-mass young stellar object, IRAS 16293-2422 in ρ Oph East, and a fringe-phase and position reference source, ICRF J162546.8-252738, using the VLBI Exploration of Radio Astrometry (VERA) for high-precision astrometry. We obtained an annual parallax of a maser feature to be π = 5.6+1.5-0.5 mas, corresponding to a distance of D = 178+18-37 pc. We also found 10 relative proper motions of maser features with respect to the maser feature mentioned above. The motion of the accompanying young stellar object (YSO) has already been found in thermal continuum emission previously observed with the Very Large Array. The intrinsic motions of masers have been estimated from the relative proper motions after the YSO's motion is subtracted from, and a systemic secular motion of the position reference feature is added to the proper motions originally measured. The intrinsic maser kinematical structure may trace a bipolar outflow.

Abstract

We report on results of multi-epoch VLBI observations of H2O masers associated with a low-mass young stellar object, IRAS 16293-2422 in ρ Oph East, and a fringe-phase and position reference source, ICRF J162546.8-252738, using the VLBI Exploration of Radio Astrometry (VERA) for high-precision astrometry. We obtained an annual parallax of a maser feature to be π = 5.6+1.5-0.5 mas, corresponding to a distance of D = 178+18-37 pc. We also found 10 relative proper motions of maser features with respect to the maser feature mentioned above. The motion of the accompanying young stellar object (YSO) has already been found in thermal continuum emission previously observed with the Very Large Array. The intrinsic motions of masers have been estimated from the relative proper motions after the YSO's motion is subtracted from, and a systemic secular motion of the position reference feature is added to the proper motions originally measured. The intrinsic maser kinematical structure may trace a bipolar outflow.

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Detection table from Imai et al. (2007)

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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	+16 32 22.85	-24 28 36.4			353.9354389	15.8393091	G353.936+15.839			IRAS 16293-2422	Image	Descr	22 GHz;				VERA	+H₂O -CH₃OH I -CH₃OH II	SFR	0.178 (-37 +18)	2003 Oct - 2004 November
	+16 32 22.890168	-24 28 36.07004	602.64 mas	330.04 mas	353.935614	15.839253		1	1	IRAS 16293-2422				0.65	19.91 (2.25)	16.28 (2.34)
	+16 32 22.8911007	-24 28 36.07888	616.63 mas	321.2 mas	353.935615	15.839249		2	2	IRAS 16293-2422				2.02	28.02 (1.77)	51.62 (3.39)
	+16 32 22.892486	-24 28 36.05816	637.41 mas	341.92 mas	353.935623	15.839248		3	3	IRAS 16293-2422				2.79	46.79 (1.6)	25.45 (2.5)
	+16 32 22.844612	-24 28 36.36336	-80.7 mas	36.72 mas	353.935433	15.839331		4	4	IRAS 16293-2422				4.19	1.98 (0.35)	-1.09 (0.5)
	+16 32 22.849992	-24 28 36.40008	0 mas	0 mas	353.935439	15.839309		5	5	IRAS 16293-2422				4.43	0 (0.04)	0 (0.08)
	+16 32 22.8499027	-24 28 36.39717	-1.34 mas	2.91 mas	353.935439	15.839310		6	6	IRAS 16293-2422				4.61	-4.43 (1.9)	10.98 (3.75)
	+16 32 22.849598	-24 28 36.39797	-5.91 mas	2.11 mas	353.935438	15.839311		7	7	IRAS 16293-2422				4.64	-4.26 (0.51)	1.26 (0.79)
	+16 32 22.850034	-24 28 36.4007	0.63 mas	-0.62 mas	353.935439	15.839309		8	8	IRAS 16293-2422				5.07	2.58 (0.37)	2.06 (0.33)
	+16 32 22.849888	-24 28 36.40004	-1.56 mas	0.04 mas	353.935439	15.839309		9	9	IRAS 16293-2422				5.07	-7.71 (1.26)	10.75 (2.11)
	+16 32 22.8500127	-24 28 36.39992	0.31 mas	0.16 mas	353.935439	15.839309		10	10	IRAS 16293-2422				5.07	1.71 (0.71)	2.29 (0.29)

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 'IMA07' 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 'IMA07' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

IMA07 - Astrometry of H2O Masers in Nearby Star-Forming Regions with VERA I. IRAS 16293-2422 in Ï Oph East

Interferometry data

View as list of objects

Detection table from Imai et al. (2007)

IMA07 - Astrometry of H₂O Masers in Nearby Star-Forming Regions with VERA I. IRAS 16293-2422 in Ï Oph East