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OH10 - VERA Observations of H₂O Maser Sources in Three Massive Star-Forming Regions and Galactic Rotation Measurements

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Short title: Oh et al. (2010)
Authors: Oh, Chung SikKobayashi, HideyukiHonma, MarekiHirota, TomoyaSato, KatsuhisaUeno, Yuji
Journal: Publications of the Astronomical Society of Japan, Vol.62, No.1, pp.101--114
Bibcode:

Target type: High_mass_SFR

Abstract
We present the results of VLBI observations of three H₂O maser sources in massive star-forming regions: IRAS 06058+2138, IRAS 19213+1723, and AFGL 2789. We determined the annual parallaxes and proper motions for these sources by a phase-referencing method. The estimated distances to IRAS 06058+2138 and AFGL 2789 are 1.76Â�0.11kpc and 3.07Â�0.30kpc, which are located in the Perseus spiral arm. The distance to IRAS 19213+1723 is 3.98Â�0.57 kpc, placing it in the Carina-Sagittarius arm. With estimated 3-dimensional velocity components, we have shown that the galactic rotation curve is flat in the range of 6.4 kpc â�� R â�� 13 kpc as combining with S 269, which was observed with VERA. We have also found that the overall rotation curve of the Galaxy do not depend on Î˜₀. The maser sources also show deviations from flat rotation curves by a few kilometers per second. We discuss possible reasons for these peculiar motions.

Abstract

We present the results of VLBI observations of three H₂O maser sources in massive star-forming regions: IRAS 06058+2138, IRAS 19213+1723, and AFGL 2789. We determined the annual parallaxes and proper motions for these sources by a phase-referencing method. The estimated distances to IRAS 06058+2138 and AFGL 2789 are 1.76Â�0.11kpc and 3.07Â�0.30kpc, which are located in the Perseus spiral arm. The distance to IRAS 19213+1723 is 3.98Â�0.57 kpc, placing it in the Carina-Sagittarius arm. With estimated 3-dimensional velocity components, we have shown that the galactic rotation curve is flat in the range of 6.4 kpc â�� R â�� 13 kpc as combining with S 269, which was observed with VERA. We have also found that the overall rotation curve of the Galaxy do not depend on Î˜₀. The maser sources also show deviations from flat rotation curves by a few kilometers per second. We discuss possible reasons for these peculiar motions.

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Detection table from Oh 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	F_peak	Telescope	V_step	RMS	Beam	Detection	Class	Distance	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						H₂O	(km/s)	(Jy)		(km/s)	(mJy/beam)	(arcsec)	Yes/No		(kpc)	(kpc)
1	+06 08 53.4938	+21 38 30.7408			188.946018	0.88672	G188.946+0.887		IRAS 06058+2138	Image	Descr	22 GHz;	-8.6 .. 6.1	1.2 .. 24.2	VERA	0.21	90.000	0.0015 x 0.0009	+H₂O +CH₃OH I +CH₃OH II +OH	SFR_MIXED	1.760		2006 - 2008
	+06 08 53.4986	+21 38 30.6838	70.67 mas	-55.44 mas	188.946041	0.886728		1	IRAS 06058+2138				6.1	8
	+06 08 53.4938	+21 38 30.7333	-0.45 mas	-5.91 mas	188.946020	0.886718		2	IRAS 06058+2138				3.79	4.7
	+06 08 53.4936	+21 38 30.7476	-3.33 mas	8.4 mas	188.946016	0.886720		3	IRAS 06058+2138				2.74	2.3
	+06 08 53.4941	+21 38 30.7453	4.52 mas	6.11 mas	188.946018	0.886721		4	IRAS 06058+2138				2.32	5.7
	+06 08 53.4929	+21 38 30.7356	-13.56 mas	-3.63 mas	188.946018	0.886716		5	IRAS 06058+2138				2.11	5.1
	+06 08 53.4939	+21 38 30.7307	0.6 mas	-8.52 mas	188.946021	0.886718		6	IRAS 06058+2138				1.9	20.6
	+06 08 53.494	+21 38 30.7387	2.61 mas	-0.5 mas	188.946019	0.886720		7	IRAS 06058+2138				1.27	8.6
	+06 08 53.4928	+21 38 30.7303	-15.13 mas	-8.89 mas	188.946019	0.886715		8	IRAS 06058+2138				1.06	18.9
	+06 08 53.494	+21 38 30.7318	2.11 mas	-7.42 mas	188.946021	0.886719		9	IRAS 06058+2138				0.64	14
	+06 08 53.4929	+21 38 30.6535	-13.78 mas	-85.67 mas	188.946038	0.886705		10	IRAS 06058+2138				-4.82	1.2
	+06 08 53.4929	+21 38 30.6505	-13.64 mas	-88.72 mas	188.946038	0.886704		11	IRAS 06058+2138				-5.45	5.4
	+06 08 53.4938	+21 38 30.7392	0 mas	0 mas	188.946019	0.886719		12	IRAS 06058+2138				-8.6	2.3
	+06 08 53.353	+21 38 11.6047	-2112.61 mas	-19134.5 mas	188.950405	0.883667		13	IRAS 06058+2138				0.43	10.9
	+06 08 53.2628	+21 38 10.7963	-3466.04 mas	-19942.9 mas	188.950432	0.883253		14	IRAS 06058+2138				-3.77	24.2
2	+19 23 37.3229	+17 29 10.4794			52.100531	1.042764	G52.097+1.042		IRAS 19213+1723	Image	Descr	22 GHz;	-33.8 .. -27.5	51.6 .. 169.2	VERA	0.21	90.000	0.0015 x 0.0009	+H₂O -CH₃OH I -CH₃OH II	SFR	3.980		2006 - 2008
	+19 23 37.3229	+17 29 10.479	0.19 mas	0.56 mas	52.100531	1.042764		1	IRAS 19213+1723				-27.5	51.6
	+19 23 37.3229	+17 29 10.4785	-0.06 mas	0.08 mas	52.100531	1.042764		2	IRAS 19213+1723				-29.2	169.2
	+19 23 37.3229	+17 29 10.4784	0 mas	0 mas	52.100530	1.042764		3	IRAS 19213+1723				-31.3	107
	+19 23 37.3229	+17 29 10.4784	0.0699999 mas	0.03 mas	52.100531	1.042764		4	IRAS 19213+1723				-33.8	60.9
3	+21 39 58.2717	+50 14 21.014			94.602526	-1.796121	G94.603-1.796		AFGL 2789	Image	Descr	22 GHz;	-56.7 .. -44.1	1.2 .. 19.8	VERA	0.42	90.000	0.0015 x 0.0009	+H₂O -CH₃OH I +CH₃OH II -OH -SiO	SFR_MIXED	3.070		2006 - 2008
	+21 39 58.2718	+50 14 21.0156	0 mas	0 mas	94.602526	-1.796121		1	AFGL 2789				-44.1	18.7
	+21 39 58.2713	+50 14 21.0607	-7.52 mas	45.13 mas	94.602533	-1.796110		2	AFGL 2789				-45.8	2.2
	+21 39 58.2718	+50 14 21.0141	1.23 mas	-1.49 mas	94.602526	-1.796121		3	AFGL 2789				-45.8	5.8
	+21 39 58.2711	+50 14 21.0035	-10.02 mas	-12.09 mas	94.602522	-1.796122		4	AFGL 2789				-48.7	1.6
	+21 39 58.2725	+50 14 21.0146	10.91 mas	-1.04 mas	94.602527	-1.796122		5	AFGL 2789				-49.2	1.2
	+21 39 58.2716	+50 14 21.0173	-1.71 mas	1.67 mas	94.602526	-1.796120		6	AFGL 2789				-53.7	19.8
	+21 39 58.2717	+50 14 21.0164	-1.33 mas	0.78 mas	94.602526	-1.796120		7	AFGL 2789				-55	7.2
	+21 39 58.2716	+50 14 21.0123	-1.69 mas	-3.3 mas	94.602525	-1.796121		8	AFGL 2789				-56.7	5.2

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 'OH10' 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 'OH10' AND detected=true AND hide=false ORDER BY detected DESC,id

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OH10 - VERA Observations of H2O Maser Sources in Three Massive Star-Forming Regions and Galactic Rotation Measurements

Interferometry data

View as list of objects

Detection table from Oh et al. (2010)

OH10 - VERA Observations of H₂O Maser Sources in Three Massive Star-Forming Regions and Galactic Rotation Measurements