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FIS10 - Global Very Long Baseline Interferometry Observations of the 6.0 GHz Hydroxyl Masers in Onsala 1

Interferometry data

Short title: Fish & Sjouwerman (2010)
Authors: Fish, Vincent L.Sjouwerman, Loránt O.
Journal: The Astrophysical Journal, Volume 716, Issue 1, pp. 106-113 (2010).
Bibcode:
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Target type: High_mass_SFR
Observations category: SF.general
Facility type: interferometer
Transitions: OH_6030,OH_6035

Abstract
We present global very long baseline interferometry observations of the first excited-state hydroxyl (OH) masers in the massive star-forming region Onsala 1 (ON 1). The 29 masers detected are nearly all from the 6035 MHz transition and nearly all are identifiable as Zeeman pair components. The 6030 and 6035 MHz masers are coincident with previously published positions of ground-state masers to within a few milliarcseconds, and the magnetic fields deduced from Zeeman splitting are comparable. The 6.0 GHz masers in ON 1 are always found in close spatial association with 1665 MHz OH masers, in contrast to the situation in the massive star-forming region W3(OH), suggesting that extreme high density OH maser sites (excited-state masers with no accompanying ground-state maser, as seen in W3(OH)) are absent from ON 1. The large magnetic field strength among the northern, blueshifted masers is confirmed. The northern masers may trace an outflow or be associated with an exciting source separate from the other masers, or the relative velocities of the northern and southern masers may be indicative of expansion and rotation. High angular resolution observations of nonmasing material will be required in order to understand the complex maser distribution in ON 1.

Abstract

We present global very long baseline interferometry observations of the first excited-state hydroxyl (OH) masers in the massive star-forming region Onsala 1 (ON 1). The 29 masers detected are nearly all from the 6035 MHz transition and nearly all are identifiable as Zeeman pair components. The 6030 and 6035 MHz masers are coincident with previously published positions of ground-state masers to within a few milliarcseconds, and the magnetic fields deduced from Zeeman splitting are comparable. The 6.0 GHz masers in ON 1 are always found in close spatial association with 1665 MHz OH masers, in contrast to the situation in the massive star-forming region W3(OH), suggesting that extreme high density OH maser sites (excited-state masers with no accompanying ground-state maser, as seen in W3(OH)) are absent from ON 1. The large magnetic field strength among the northern, blueshifted masers is confirmed. The northern masers may trace an outflow or be associated with an exciting source separate from the other masers, or the relative velocities of the northern and southern masers may be indicative of expansion and rotation. High angular resolution observations of nonmasing material will be required in order to understand the complex maser distribution in ON 1.

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Detection table from Fish & Sjouwerman (2010)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	grpv	#	Source name	Line	Frequency	V_peak	F_peak	Telescope	V_step	Beam	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)					OH	(MHz)	(km/s)	(Jy)		(km/s)	(arcsec)	Yes/No		(kpc)
1	+20 10 9.0768	+31 31 34.923			69.539928	-0.975751	G69.540-0.976	G69.5399-0.9757		ON1	6030;	6030	13.79 .. 14.12	1.297 .. 3.244	VLBA	0.049	0.006	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		2008 June 15
	+20 10 9.01975	+31 31 35.6203	-855.753 mas	699.107 mas	69.539980	-0.975476			1	ON1		6030	13.79	3.244
	+20 10 9.01973	+31 31 35.6202	-856.052 mas	698.982 mas	69.539980	-0.975476			2	ON1		6030	14.12	1.297
	+20 10 9.01975	+31 31 35.6203	-855.762 mas	699.078 mas	69.539980	-0.975476			3	ON1		6030	13.81	2.323
2	+20 10 9.0768	+31 31 34.923			69.539928	-0.975751	G69.540-0.976	G69.5399-0.9757		ON1	6035 MHz;	6035	-0.63 .. 15.45	0.195 .. 10.274	VLBA	0.049	0.006	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		2008 June 15
	+20 10 9.01788	+31 31 35.629	-883.778 mas	707.787 mas	69.539979	-0.975469			1	ON1		6035	12.36	0.201
	+20 10 9.01792	+31 31 35.6286	-883.134 mas	707.356 mas	69.539979	-0.975469			2	ON1		6035	12.61	0.262
	+20 10 9.01974	+31 31 35.6202	-855.931 mas	698.986 mas	69.539980	-0.975476			3	ON1		6035	13.82	2.499
	+20 10 9.01974	+31 31 35.6201	-855.852 mas	698.853 mas	69.539980	-0.975476			4	ON1		6035	14.06	1.374
	+20 10 9.0203	+31 31 35.6125	-847.432 mas	691.329 mas	69.539980	-0.975479			5	ON1		6035	13.92	0.405
	+20 10 9.05962	+31 31 35.0214	-257.68 mas	100.194 mas	69.539918	-0.975685			6	ON1		6035	15.16	0.622
	+20 10 9.05958	+31 31 35.0208	-258.373 mas	99.586 mas	69.539918	-0.975685			7	ON1		6035	15.42	0.475
	+20 10 9.06013	+31 31 35.0241	-250.056 mas	102.927 mas	69.539920	-0.975686			8	ON1		6035	15.18	1.276
	+20 10 9.06013	+31 31 35.0243	-250.018 mas	103.112 mas	69.539920	-0.975686			9	ON1		6035	15.45	0.824
	+20 10 9.06161	+31 31 35.0237	-227.783 mas	102.493 mas	69.539922	-0.975691			10	ON1		6035	13.98	0.195
	+20 10 9.06165	+31 31 35.023	-227.264 mas	101.794 mas	69.539922	-0.975691			11	ON1		6035	14.28	0.241
	+20 10 9.06328	+31 31 35.0092	-202.76 mas	87.994 mas	69.539922	-0.975698			12	ON1		6035	14.78	0.229
	+20 10 9.06327	+31 31 35.0091	-203 mas	87.858 mas	69.539922	-0.975698			13	ON1		6035	15.07	0.218
	+20 10 9.06824	+31 31 35.9158	-128.465 mas	994.596 mas	69.540143	-0.975575			14	ON1		6035	5.51	2.229
	+20 10 9.06823	+31 31 35.9167	-128.492 mas	995.516 mas	69.540143	-0.975575			15	ON1		6035	5.5	0.227
	+20 10 9.07348	+31 31 35.935	-49.76 mas	1013.78 mas	69.540158	-0.975588			16	ON1		6035	-0.2	2.241
	+20 10 9.07347	+31 31 35.9349	-49.883 mas	1013.68 mas	69.540158	-0.975588			17	ON1		6035	0.48	1.702
	+20 10 9.07361	+31 31 35.9327	-47.799 mas	1011.48 mas	69.540157	-0.975589			18	ON1		6035	-0.63	0.668
	+20 10 9.0768	+31 31 34.9212	0 mas	0 mas	69.539928	-0.975752			19	ON1		6035	14.5	10.274
	+20 10 9.07681	+31 31 34.9207	0.148 mas	-0.515 mas	69.539928	-0.975752			20	ON1		6035	14.79	0.32
	+20 10 9.07902	+31 31 35.4543	33.361 mas	533.13 mas	69.540057	-0.975677			21	ON1		6035	13.67	1.981
	+20 10 9.07904	+31 31 35.4545	33.598 mas	533.325 mas	69.540057	-0.975677			22	ON1		6035	13.76	0.919
	+20 10 9.08671	+31 31 34.9208	148.685 mas	-0.352 mas	69.539947	-0.975781			23	ON1		6035	14.4	0.583
	+20 10 9.08662	+31 31 34.9219	147.241 mas	0.679 mas	69.539947	-0.975781			24	ON1		6035	14.47	0.446
	+20 10 9.0875	+31 31 34.9148	160.529 mas	-6.392 mas	69.539947	-0.975784			25	ON1		6035	14.43	1.147
	+20 10 9.08752	+31 31 34.9144	160.754 mas	-6.787 mas	69.539947	-0.975785			26	ON1		6035	14.5	0.976
	+20 10 9.0768	+31 31 34.923			69.539928	-0.975751	G69.540-0.976	G69.5399-0.9757		ON1	6035 MHz;	6035	-0.63 .. 15.45	0.195 .. 10.274	VLBA	0.049	0.006	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		2008 June 15
	+20 10 9.01788	+31 31 35.629	-883.778 mas	707.787 mas	69.539979	-0.975469			1	ON1		6035	12.36	0.201
	+20 10 9.01792	+31 31 35.6286	-883.134 mas	707.356 mas	69.539979	-0.975469			2	ON1		6035	12.61	0.262
	+20 10 9.01974	+31 31 35.6202	-855.931 mas	698.986 mas	69.539980	-0.975476			3	ON1		6035	13.82	2.499
	+20 10 9.01974	+31 31 35.6201	-855.852 mas	698.853 mas	69.539980	-0.975476			4	ON1		6035	14.06	1.374
	+20 10 9.0203	+31 31 35.6125	-847.432 mas	691.329 mas	69.539980	-0.975479			5	ON1		6035	13.92	0.405
	+20 10 9.05962	+31 31 35.0214	-257.68 mas	100.194 mas	69.539918	-0.975685			6	ON1		6035	15.16	0.622
	+20 10 9.05958	+31 31 35.0208	-258.373 mas	99.586 mas	69.539918	-0.975685			7	ON1		6035	15.42	0.475
	+20 10 9.06013	+31 31 35.0241	-250.056 mas	102.927 mas	69.539920	-0.975686			8	ON1		6035	15.18	1.276
	+20 10 9.06013	+31 31 35.0243	-250.018 mas	103.112 mas	69.539920	-0.975686			9	ON1		6035	15.45	0.824
	+20 10 9.06161	+31 31 35.0237	-227.783 mas	102.493 mas	69.539922	-0.975691			10	ON1		6035	13.98	0.195
	+20 10 9.06165	+31 31 35.023	-227.264 mas	101.794 mas	69.539922	-0.975691			11	ON1		6035	14.28	0.241
	+20 10 9.06328	+31 31 35.0092	-202.76 mas	87.994 mas	69.539922	-0.975698			12	ON1		6035	14.78	0.229
	+20 10 9.06327	+31 31 35.0091	-203 mas	87.858 mas	69.539922	-0.975698			13	ON1		6035	15.07	0.218
	+20 10 9.06824	+31 31 35.9158	-128.465 mas	994.596 mas	69.540143	-0.975575			14	ON1		6035	5.51	2.229
	+20 10 9.06823	+31 31 35.9167	-128.492 mas	995.516 mas	69.540143	-0.975575			15	ON1		6035	5.5	0.227
	+20 10 9.07348	+31 31 35.935	-49.76 mas	1013.78 mas	69.540158	-0.975588			16	ON1		6035	-0.2	2.241
	+20 10 9.07347	+31 31 35.9349	-49.883 mas	1013.68 mas	69.540158	-0.975588			17	ON1		6035	0.48	1.702
	+20 10 9.07361	+31 31 35.9327	-47.799 mas	1011.48 mas	69.540157	-0.975589			18	ON1		6035	-0.63	0.668
	+20 10 9.0768	+31 31 34.9212	0 mas	0 mas	69.539928	-0.975752			19	ON1		6035	14.5	10.274
	+20 10 9.07681	+31 31 34.9207	0.148 mas	-0.515 mas	69.539928	-0.975752			20	ON1		6035	14.79	0.32
	+20 10 9.07902	+31 31 35.4543	33.361 mas	533.13 mas	69.540057	-0.975677			21	ON1		6035	13.67	1.981
	+20 10 9.07904	+31 31 35.4545	33.598 mas	533.325 mas	69.540057	-0.975677			22	ON1		6035	13.76	0.919
	+20 10 9.08671	+31 31 34.9208	148.685 mas	-0.352 mas	69.539947	-0.975781			23	ON1		6035	14.4	0.583
	+20 10 9.08662	+31 31 34.9219	147.241 mas	0.679 mas	69.539947	-0.975781			24	ON1		6035	14.47	0.446
	+20 10 9.0875	+31 31 34.9148	160.529 mas	-6.392 mas	69.539947	-0.975784			25	ON1		6035	14.43	1.147
	+20 10 9.08752	+31 31 34.9144	160.754 mas	-6.787 mas	69.539947	-0.975785			26	ON1		6035	14.5	0.976

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

select MAX(oh_data_all.ra_hms) as ra_hms,MAX(oh_data_all.dec_dms) as dec_dms,MAX(oh_data_all.source_name) as source_name,MAX(oh_data_all.ra) as ra,MAX(oh_data_all.dec) as dec,MAX(oh_data_all.l) as l,MAX(oh_data_all.b) as b,MAX(oh_data_all.grp) as grp,MAX(oh_data_all.grpv) as grpv,MAX(oh_data_all.other_name) as other_name,MAX(oh_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(oh_data_all.line) as line,MAX(oh_data_all.freq) as freq,MAX(oh_data_all.pol) as pol,MAX(oh_data_all.vrange) as vrange,MAX(oh_data_all.vpeak) as vpeak,MAX(oh_data_all.peak) as peak,MAX(oh_data_all.fwhm) as fwhm,MAX(oh_data_all.int) as int,MAX(oh_data_all.rms) as rms,MAX(oh_data_all.units) as units,MAX(oh_data_all.units_rms) as units_rms,MAX(oh_data_all.date_txt) as date_txt,MAX(oh_data_all.telescope_ref) as telescope_ref,MAX(oh_data_all.telescope_conf) as telescope_conf,MAX(oh_data_all.v_step) as v_step,MAX(oh_data_all.beam) as beam,MAX(oh_data_all.beam_maj) as beam_maj,MAX(oh_data_all.beam_min) as beam_min,MAX(oh_data_all.beam_pa) as beam_pa,MAX(oh_data_all.ref) as ref,MAX(oh_data_all.list_ref) as list_ref,MAX(oh_data_all.ascii) as ascii,MAX(oh_data_all.url) as url,MAX(oh_data_all.image) as image,MAX(oh_data_all.image2) as image2,MAX(oh_data_all.image3) as image3,MAX(oh_data_all.descr) as descr,MAX(oh_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(oh_data_all.dist) as dist,1 as dist_parallax,MAX(oh_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 oh_data_all  LEFT JOIN all_objects_withmet ON oh_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 oh_data_all.line=transitions."Line"  WHERE ref ilike 'FIS10' AND detected=true AND hide=false GROUP BY ref

select oh_data_all.ra_hms,oh_data_all.dec_dms,oh_data_all.source_name,oh_data_all.ra,oh_data_all.dec,oh_data_all.l,oh_data_all.b,oh_data_all.grp,oh_data_all.grpv,oh_data_all.other_name,oh_data_all.other_desc,oh_data_all.thermal,oh_data_all.line,oh_data_all.freq,oh_data_all.pol,oh_data_all.vrange,oh_data_all.vpeak,oh_data_all.peak,oh_data_all.fwhm,oh_data_all.int,oh_data_all.rms,oh_data_all.units,oh_data_all.units_rms,oh_data_all.date_txt,oh_data_all.telescope_ref,oh_data_all.telescope_conf,oh_data_all.v_step,oh_data_all.beam,oh_data_all.beam_maj,oh_data_all.beam_min,oh_data_all.beam_pa,oh_data_all.ref,oh_data_all.list_ref,oh_data_all.ascii,oh_data_all.url,oh_data_all.image,oh_data_all.image2,oh_data_all.image3,oh_data_all.descr,oh_data_all.id,oh_data_all.mjy_flag,oh_data_all.rms_mjy_flag,oh_data_all.dist,oh_data_all.dist_parallax,oh_data_all.date_txt,line_det,type,simbad_types_cat FROM oh_data_all   LEFT JOIN all_objects_withmet ON oh_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 oh_data_all.line=transitions."Line"  WHERE ref ilike 'FIS10' AND detected=true AND hide=false ORDER BY detected DESC,id

Display data from paper

FIS10 - Global Very Long Baseline Interferometry Observations of the 6.0 GHz Hydroxyl Masers in Onsala 1

Interferometry data

View as list of objects

Detection table from Fish & Sjouwerman (2010)