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MOT11B - New Distance and Revised Natures of High-Mass Star Formation in G5.89-0.39

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Short title: Motogi et al. (2011b)
Authors: Motogi, KazuhitoSorai, KazuoHabe, AsaoHonma, MarekiKobayashi, HideyukiSato, Katsuhisa
Journal: Publications of the Astronomical Society of Japan, Vol.63, No.1, pp.31--44
Bibcode:

Target type: High_mass_SFR

Abstract
We report on astrometric observations of the 22 GHz H₂O masers in the high-mass star-forming region G5.89-0.39 with VERA (VLBI Exploration of Radio Astrometry). A newly derived distance of 1.28^+0.09_-0.08 kpc is the most precise, and is significantly nearer than the previous values. We revised the physical parameters and reconsidered the nature of G5.89-0.39 based on the new distance as follows: (1) The ionizing star of the ultra compact (UC) HII region is a late O-type (O8-O8.5) zero age main sequence (ZAMS) star, consistent with previously established limits based on its infrared spectral line emission. (2) Crescent-like maser alignment at the position of the O-type ZAMS star may trace an accretion disk (or its remnant), which suggests that the star is still young, and before complete evaporation of circumstellar materials. (3) Although the revised mass for the east-west outflow has been reduced, it is still quite large (100 M_odot), which indicates that a significant fraction of the mass is entrained material, and that the dynamical age significantly underestimates the actual outflow age. Our newly-derived distance emphasizes that G5.89-0.39 is one of the nearest targets to investigate ongoing high-mass star formation and evolution in a compact cluster containing a young O-type star.

Abstract

We report on astrometric observations of the 22 GHz H₂O masers in the high-mass star-forming region G5.89-0.39 with VERA (VLBI Exploration of Radio Astrometry). A newly derived distance of 1.28^+0.09_-0.08 kpc is the most precise, and is significantly nearer than the previous values. We revised the physical parameters and reconsidered the nature of G5.89-0.39 based on the new distance as follows: (1) The ionizing star of the ultra compact (UC) HII region is a late O-type (O8-O8.5) zero age main sequence (ZAMS) star, consistent with previously established limits based on its infrared spectral line emission. (2) Crescent-like maser alignment at the position of the O-type ZAMS star may trace an accretion disk (or its remnant), which suggests that the star is still young, and before complete evaporation of circumstellar materials. (3) Although the revised mass for the east-west outflow has been reduced, it is still quite large (100 M_odot), which indicates that a significant fraction of the mass is entrained material, and that the dynamical age significantly underestimates the actual outflow age. Our newly-derived distance emphasizes that G5.89-0.39 is one of the nearest targets to investigate ongoing high-mass star formation and evolution in a compact cluster containing a young O-type star.

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Detection table from Motogi et al. (2011b)

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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	F_peak	Epoch	Telescope	V_step	RMS	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)							H₂O	(km/s)	(mas/yr)	(mas/yr)	(mas)	(Jy/beam)	#		(km/s)	(Jy/beam)	(arcsec)	Yes/No		(kpc)
1	+18 00 30.3066	-24 04 4.48649			5.8842648	-0.3924371	G5.885-0.392			G5.89-0.39	Image	Descr	22 GHz;							VERA	0.21	0.820	2.62	+H₂O +CH₃OH I +CH₃OH II +OH	GALAXY	1.28 (+0.09 -0.08)	2007 Nov - 2009 May
	+18 00 30.3066	-24 04 4.48644	0 mas	0 mas	5.884265	-0.392437		1	O1	G5.89-0.39				74	-0.43 (0.09)	-1.43 (0.29)	0.79 (0.05)	74	Combined
	+18 00 30.4400573	-24 04 0.79703	2001.86 mas	3689.41 mas	5.885406	-0.392369		2	C6	G5.89-0.39				75.6	0.77 (0.14)	-0.47 (0.30)	0.77 (0.09)	75.6	Combined
	+18 00 30.3066	-24 04 4.48644	0 mas	0 mas	5.884265	-0.392437		3	O1	G5.89-0.39				80.3				80.3	1
	+18 00 30.3065867	-24 04 4.48647	-0.2 mas	-0.03 mas	5.884265	-0.392437		4		G5.89-0.39				72.1				72.1	2
	+18 00 30.3065747	-24 04 4.4865	-0.38 mas	-0.06 mas	5.884265	-0.392437		5		G5.89-0.39				63.6				63.6	3
	+18 00 30.306564	-24 04 4.48652	-0.54 mas	-0.08 mas	5.884265	-0.392437		6		G5.89-0.39				32				32	4
	+18 00 30.3065527	-24 04 4.48655	-0.71 mas	-0.11 mas	5.884265	-0.392437		7		G5.89-0.39				19.6				19.6	5
	+18 00 30.3065253	-24 04 4.48661	-1.12 mas	-0.17 mas	5.884265	-0.392437		8		G5.89-0.39				21.7				21.7	6
	+18 00 30.3065093	-24 04 4.48665	-1.36 mas	-0.21 mas	5.884265	-0.392437		9		G5.89-0.39				14.2				14.2	7
	+18 00 30.30649	-24 04 4.48669	-1.65 mas	-0.25 mas	5.884264	-0.392437		10		G5.89-0.39				10.1				10.1	8
	+18 00 30.306466	-24 04 4.48675	-2.01 mas	-0.31 mas	5.884264	-0.392437		11		G5.89-0.39				5.5				5.5	9
	+18 00 30.30554	-24 04 4.48411	-15.9 mas	2.33 mas	5.884263	-0.392433		12	O2	G5.89-0.39				7				7	1
	+18 00 30.3055173	-24 04 4.48414	-16.24 mas	2.3 mas	5.884263	-0.392433		13		G5.89-0.39				5.9				5.9	2
	+18 00 30.3054993	-24 04 4.48419	-16.51 mas	2.25 mas	5.884263	-0.392433		14		G5.89-0.39				5.1				5.1	3
	+18 00 30.3054913	-24 04 4.48432	-16.63 mas	2.12 mas	5.884263	-0.392433		15		G5.89-0.39				3.4				3.4	4
	+18 00 30.3054767	-24 04 4.48436	-16.85 mas	2.08 mas	5.884263	-0.392433		16		G5.89-0.39				3.2				3.2	5
	+18 00 30.305456	-24 04 4.48457	-17.16 mas	1.87 mas	5.884263	-0.392433		17		G5.89-0.39				2.7				2.7	6
	+18 00 30.3054533	-24 04 4.48468	-17.2 mas	1.76 mas	5.884263	-0.392433		18		G5.89-0.39				5.1				5.1	7
	+18 00 30.3054207	-24 04 4.48466	-17.69 mas	1.78 mas	5.884263	-0.392433		19		G5.89-0.39				4.2				4.2	8
	+18 00 30.4368687	-24 04 0.63365	1954.03 mas	3852.79 mas	5.885440	-0.392336		20	C1	G5.89-0.39				3.3				3.3	8
	+18 00 30.438876	-24 04 0.74126	1984.14 mas	3745.18 mas	5.885418	-0.392358		21	C2	G5.89-0.39				1.3				1.3	2
	+18 00 30.43625	-24 04 0.75388	1944.75 mas	3732.56 mas	5.885410	-0.392351		22	C3	G5.89-0.39				2.8				2.8	7
	+18 00 30.436342	-24 04 0.75008	1946.13 mas	3736.36 mas	5.885411	-0.392350		23	C4	G5.89-0.39				27.9				27.9	7
	+18 00 30.43984	-24 04 0.82133	1998.6 mas	3665.11 mas	5.885400	-0.392372		24	C5	G5.89-0.39				19.8				19.8	3
	+18 00 30.4400573	-24 04 0.79703	2001.86 mas	3689.41 mas	5.885406	-0.392369		25	C6	G5.89-0.39				43				43	1
	+18 00 30.4400513	-24 04 0.79667	2001.77 mas	3689.77 mas	5.885407	-0.392369		26		G5.89-0.39				56				56	2
	+18 00 30.440042	-24 04 0.7963	2001.63 mas	3690.14 mas	5.885407	-0.392369		27		G5.89-0.39				46.9				46.9	3
	+18 00 30.44004	-24 04 0.79594	2001.6 mas	3690.5 mas	5.885407	-0.392369		28		G5.89-0.39				39.8				39.8	4
	+18 00 30.440036	-24 04 0.79569	2001.54 mas	3690.75 mas	5.885407	-0.392369		29		G5.89-0.39				28.3				28.3	5
	+18 00 30.4400247	-24 04 0.79546	2001.37 mas	3690.98 mas	5.885407	-0.392369		30		G5.89-0.39				13.7				13.7	6
	+18 00 30.4400327	-24 04 0.79521	2001.49 mas	3691.23 mas	5.885407	-0.392369		31		G5.89-0.39				4.7				4.7	7
	+18 00 30.440032	-24 04 0.79465	2001.48 mas	3691.79 mas	5.885407	-0.392369		32		G5.89-0.39				1.9				1.9	8
	+18 00 30.440032	-24 04 0.79435	2001.48 mas	3692.09 mas	5.885407	-0.392369		33		G5.89-0.39				5.1				5.1	9
	+18 00 30.436244	-24 04 0.75355	1944.66 mas	3732.89 mas	5.885410	-0.392351		34	C7	G5.89-0.39				22.1				22.1	7
	+18 00 30.4393	-24 04 0.82351	1990.5 mas	3662.93 mas	5.885399	-0.392370		35	C8	G5.89-0.39				9.9				9.9	3
	+18 00 30.438516	-24 04 0.81834	1978.74 mas	3668.1 mas	5.885398	-0.392367		36		G5.89-0.39				8.2				8.2	1
	+18 00 30.4384987	-24 04 0.81829	1978.48 mas	3668.15 mas	5.885398	-0.392367		37		G5.89-0.39				3.9				3.9	2
	+18 00 30.43848	-24 04 0.8181	1978.2 mas	3668.34 mas	5.885398	-0.392367		38		G5.89-0.39				6.7				6.7	3
	+18 00 30.43845	-24 04 0.81784	1977.75 mas	3668.6 mas	5.885398	-0.392367		39		G5.89-0.39				18				18	5
	+18 00 30.5687693	-24 04 0.30049	3932.54 mas	4185.95 mas	5.885769	-0.392726		40	N	G5.89-0.39				2.9				2.9	2
	+18 00 30.5687427	-24 04 0.2999	3932.14 mas	4186.54 mas	5.885769	-0.392726		41		G5.89-0.39				8				8	3
	+18 00 30.568536	-24 04 0.30189	3929.04 mas	4184.55 mas	5.885769	-0.392725		42		G5.89-0.39				13.7				13.7	7
	+18 00 30.6331747	-24 04 5.55721	4898.62 mas	-1070.77 mas	5.884623	-0.393663		43	S1	G5.89-0.39				12.6				12.6	4
	+18 00 30.6331653	-24 04 5.5571	4898.48 mas	-1070.66 mas	5.884623	-0.393663		44		G5.89-0.39				11.3				11.3	5
	+18 00 30.6331513	-24 04 5.55803	4898.27 mas	-1071.59 mas	5.884623	-0.393663		45		G5.89-0.39				4.7				4.7	6
	+18 00 30.6331567	-24 04 5.55812	4898.35 mas	-1071.68 mas	5.884623	-0.393663		46		G5.89-0.39				2.4				2.4	7
	+18 00 30.6331667	-24 04 5.55758	4898.5 mas	-1071.14 mas	5.884623	-0.393663		47		G5.89-0.39				8.13					8
	+18 00 30.6330853	-24 04 5.56146	4897.28 mas	-1075.02 mas	5.884622	-0.393664		48	S2	G5.89-0.39				8.13					8

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 'MOT11B' 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 'MOT11B' AND detected=true AND hide=false ORDER BY detected DESC,id

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MOT11B - New Distance and Revised Natures of High-Mass Star Formation in G5.89-0.39

Interferometry data

View as list of objects

Detection table from Motogi et al. (2011b)