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CAS09B - Maser maps and magnetic field of OH 300.969+1.147

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Short title: Caswell et al. (2009)
Authors: Caswell, J. L.Kramer, B. HutawarakornReynolds, J. E.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 398, Issue 2, pp. 528-534.
Bibcode:
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Target type: High_mass_SFR
Observations category: SF.general
Facility type: interferometer
Transitions: OH_1665,OH_1667

Abstract
The southern maser site OH 300.969+1.147 has been studied using the Long Baseline Array of the Australia Telescope National Facility. The 1665- and 1667-MHz hydroxyl ground-state transitions were observed simultaneously. A series of maps with 0.1-arcsec spatial resolution, at velocity spacing 0.09kms^-1, and in both senses of circular polarization reveals 59 small diameter maser spots. The spots are scattered over 2 arcsec, coincident with a strong ultracompact HII region, at a distance of 4.3 kpc. 17 Zeeman pairs of oppositely polarized spots were found, all yielding magnetic field estimates towards us (negative), ranging from -1.1 to -4.7 mG, with a median value of -3.5 mG. Excited state masers of OH at 6035 and 6030 MHz at this site also display Zeeman pairs revealing a magnetic field of -5.0 mG. Weak methanol maser emission is intermingled with the OH masers, but there is no detectable closely related water maser. The consistent magnetic field direction found within this site is a striking feature of several other maser sites associated with strong HII regions studied in comparable detail. We interpret the site as a mature region nearing the end of the brief evolutionary stage that can support maser emission.

Abstract

The southern maser site OH 300.969+1.147 has been studied using the Long Baseline Array of the Australia Telescope National Facility. The 1665- and 1667-MHz hydroxyl ground-state transitions were observed simultaneously. A series of maps with 0.1-arcsec spatial resolution, at velocity spacing 0.09kms^-1, and in both senses of circular polarization reveals 59 small diameter maser spots. The spots are scattered over 2 arcsec, coincident with a strong ultracompact HII region, at a distance of 4.3 kpc. 17 Zeeman pairs of oppositely polarized spots were found, all yielding magnetic field estimates towards us (negative), ranging from -1.1 to -4.7 mG, with a median value of -3.5 mG. Excited state masers of OH at 6035 and 6030 MHz at this site also display Zeeman pairs revealing a magnetic field of -5.0 mG. Weak methanol maser emission is intermingled with the OH masers, but there is no detectable closely related water maser. The consistent magnetic field direction found within this site is a striking feature of several other maser sites associated with strong HII regions studied in comparable detail. We interpret the site as a mature region nearing the end of the brief evolutionary stage that can support maser emission.

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Detection table from Caswell et al. (2009)

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ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	Group id	grpv	#	Source name	Image	Line	Frequency	V_peak	F_peak	Telescope	V_step	RMS	Beam	PA	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						OH	(MHz)	(km/s)	(Jy/beam)		(km/s)	(mJy)	(arcsec)	(deg.)	Yes/No		(kpc)
1	+12 34 53.27	-61 39 39.6			300.968817	1.14765	G300.969+1.148	G300.9688+1.1476		OH 300.969+1.147	Image	1665 MHz;	1665	-42.78 .. -34.69	0.06 .. 15.44	ATCA	0.105	50.000	0.072 x 0.13	94	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		2000 Aug 17
	+12 34 53.2585	-61 39 39.645	-171 mas	-45 mas	300.968795	1.147636			1	OH 300.969+1.147			1665	-34.69	0.11
	+12 34 53.271	-61 39 39.604	16 mas	-4 mas	300.968819	1.147649			2	OH 300.969+1.147			1665	-34.97	2.73
	+12 34 53.2496	-61 39 40.174	-305 mas	-574 mas	300.968787	1.147488			3	OH 300.969+1.147			1665	-35.71	1.16
	+12 34 53.262	-61 39 39.549	-119 mas	51 mas	300.968800	1.147663			4	OH 300.969+1.147			1665	-35.86	0.14
	+12 34 53.2587	-61 39 40.057	-169 mas	-457 mas	300.968803	1.147521			5	OH 300.969+1.147			1665	-36.19	0.16
	+12 34 53.2569	-61 39 40.253	-195 mas	-653 mas	300.968803	1.147467			6	OH 300.969+1.147			1665	-36.53	0.36
	+12 34 53.2519	-61 39 40.149	-271 mas	-549 mas	300.968791	1.147495			7	OH 300.969+1.147			1665	-36.78	0.67
	+12 34 53.2511	-61 39 40.154	-283 mas	-554 mas	300.968789	1.147494			8	OH 300.969+1.147			1665	-37.16	0.25
	+12 34 53.2555	-61 39 40.264	-216 mas	-664 mas	300.968800	1.147464			9	OH 300.969+1.147			1665	-37.21	0.27
	+12 34 53.2583	-61 39 40.254	-175 mas	-654 mas	300.968805	1.147467			10	OH 300.969+1.147			1665	-37.92	2.8
	+12 34 53.2509	-61 39 40.162	-285 mas	-562 mas	300.968789	1.147491			11	OH 300.969+1.147			1665	-38.15	0.1
	+12 34 53.2587	-61 39 40.057	-168 mas	-457 mas	300.968803	1.147522			12	OH 300.969+1.147			1665	-38.9	0.2
	+12 34 53.2569	-61 39 40.252	-196 mas	-652 mas	300.968803	1.147467			13	OH 300.969+1.147			1665	-39.2	0.13
	+12 34 53.3039	-61 39 40.16	510 mas	-560 mas	300.968894	1.147499			14	OH 300.969+1.147			1665	-39.32	0.3
	+12 34 53.2587	-61 39 40.252	-168 mas	-652 mas	300.968806	1.147467			15	OH 300.969+1.147			1665	-40.05	0.14
	+12 34 53.2968	-61 39 41.065	403 mas	-1465 mas	300.968896	1.147247			16	OH 300.969+1.147			1665	-40.17	1.71
	+12 34 53.2741	-61 39 39.905	62 mas	-305 mas	300.968830	1.147566			17	OH 300.969+1.147			1665	-40.28	0.27
	+12 34 53.2994	-61 39 40.129	442 mas	-529 mas	300.968884	1.147507			18	OH 300.969+1.147			1665	-40.86	0.16
	+12 34 53.2865	-61 39 41.102	249 mas	-1502 mas	300.968876	1.147235			19	OH 300.969+1.147			1665	-41.01	0.21
	+12 34 53.2885	-61 39 41.098	279 mas	-1498 mas	300.968880	1.147237			20	OH 300.969+1.147			1665	-41.98	0.06
	+12 34 53.2616	-61 39 39.644	-125 mas	-44 mas	300.968801	1.147636			21	OH 300.969+1.147			1665	-34.71	0.1
	+12 34 53.259	-61 39 39.643	-164 mas	-43 mas	300.968796	1.147636			22	OH 300.969+1.147			1665	-35.31	0.14
	+12 34 53.2704	-61 39 39.601	7 mas	-1 mas	300.968818	1.147649			23	OH 300.969+1.147			1665	-35.73	1.64
	+12 34 53.2611	-61 39 39.551	-132 mas	49 mas	300.968799	1.147662			24	OH 300.969+1.147			1665	-37.3	0.27
	+12 34 53.2617	-61 39 39.554	-123 mas	46 mas	300.968800	1.147661			25	OH 300.969+1.147			1665	-37.98	0.15
	+12 34 53.2516	-61 39 40.158	-275 mas	-558 mas	300.968791	1.147493			26	OH 300.969+1.147			1665	-38.16	0.4
	+12 34 53.2615	-61 39 39.535	-127 mas	65 mas	300.968799	1.147667			27	OH 300.969+1.147			1665	-38.3	0.09
	+12 34 53.2626	-61 39 39.544	-110 mas	56 mas	300.968801	1.147664			28	OH 300.969+1.147			1665	-38.66	0.13
	+12 34 53.2527	-61 39 40.152	-259 mas	-552 mas	300.968793	1.147494			29	OH 300.969+1.147			1665	-38.65	0.39
	+12 34 53.2589	-61 39 40.052	-165 mas	-452 mas	300.968803	1.147523			30	OH 300.969+1.147			1665	-38.93	0.78
	+12 34 53.2568	-61 39 40.253	-197 mas	-653 mas	300.968803	1.147467			31	OH 300.969+1.147			1665	-39.18	5.4
	+12 34 53.2553	-61 39 40.271	-220 mas	-671 mas	300.968800	1.147462			32	OH 300.969+1.147			1665	-39.59	15.44
	+12 34 53.2581	-61 39 40.252	-177 mas	-652 mas	300.968805	1.147467			33	OH 300.969+1.147			1665	-40.11	5.52
	+12 34 53.2969	-61 39 41.061	405 mas	-1461 mas	300.968896	1.147248			34	OH 300.969+1.147			1665	-40.16	0.7
	+12 34 53.2361	-61 39 39.456	-508 mas	144 mas	300.968747	1.147685			35	OH 300.969+1.147			1665	-40.16	0.5
	+12 34 53.2735	-61 39 39.9	53 mas	-300 mas	300.968829	1.147567			36	OH 300.969+1.147			1665	-40.42	0.48
	+12 34 53.2644	-61 39 40.015	-83 mas	-415 mas	300.968813	1.147534			37	OH 300.969+1.147			1665	-40.4	0.17
	+12 34 53.3002	-61 39 40.134	454 mas	-534 mas	300.968886	1.147505			38	OH 300.969+1.147			1665	-40.9	0.2
	+12 34 53.3038	-61 39 40.157	508 mas	-557 mas	300.968894	1.147500			39	OH 300.969+1.147			1665	-41.19	0.43
	+12 34 53.2894	-61 39 41.097	292 mas	-1497 mas	300.968882	1.147237			40	OH 300.969+1.147			1665	-41.89	0.4
	+12 34 53.2591	-61 39 40.978	-163 mas	-1378 mas	300.968820	1.147266			41	OH 300.969+1.147			1665	-42.59	0.16
	+12 34 53.2992	-61 39 41.104	439 mas	-1504 mas	300.968901	1.147236			42	OH 300.969+1.147			1665	-42.78	0.57
2	+12 34 53.27	-61 39 39.6			300.968817	1.14765	G300.969+1.148	G300.9688+1.1476		OH 300.969+1.147		1667 MHz;	1667	-41.25 .. -35.22	0.06 .. 4.34	ATCA	0.105	50.000	0.072 x 0.13	94	+H₂O +CH₃OH I +CH₃OH II +OH	SFR		2000 Aug 17
	+12 34 53.2708	-61 39 39.603	13 mas	-3 mas	300.968819	1.147649			1	OH 300.969+1.147			1667	-35.22	2.96
	+12 34 53.263	-61 39 39.618	-104 mas	-18 mas	300.968803	1.147644			2	OH 300.969+1.147			1667	-35.63	0.18
	+12 34 53.2675	-61 39 39.569	-36 mas	31 mas	300.968811	1.147658			3	OH 300.969+1.147			1667	-36.12	0.08
	+12 34 53.2516	-61 39 40.34	-275 mas	-740 mas	300.968794	1.147442			4	OH 300.969+1.147			1667	-36.24	0.12
	+12 34 53.2443	-61 39 40.202	-384 mas	-602 mas	300.968777	1.147479			5	OH 300.969+1.147			1667	-37.09	0.06
	+12 34 53.2547	-61 39 40.27	-229 mas	-670 mas	300.968799	1.147462			6	OH 300.969+1.147			1667	-37.73	0.57
	+12 34 53.2582	-61 39 40.254	-176 mas	-654 mas	300.968805	1.147467			7	OH 300.969+1.147			1667	-38.48	1.38
	+12 34 53.2577	-61 39 40.248	-184 mas	-648 mas	300.968804	1.147468			8	OH 300.969+1.147			1667	-39.86	0.1
	+12 34 53.2734	-61 39 39.9	52 mas	-300 mas	300.968829	1.147567			9	OH 300.969+1.147			1667	-40.25	0.28
	+12 34 53.2869	-61 39 41.091	254 mas	-1491 mas	300.968877	1.147238			10	OH 300.969+1.147			1667	-40.54	1.04
	+12 34 53.3005	-61 39 41.113	458 mas	-1513 mas	300.968904	1.147234			11	OH 300.969+1.147			1667	-41.04	0.35
	+12 34 53.2699	-61 39 39.6	0 mas	0 mas	300.968817	1.147650			12	OH 300.969+1.147			1667	-35.64	4.02
	+12 34 53.2685	-61 39 39.557	-21 mas	43 mas	300.968813	1.147661			13	OH 300.969+1.147			1667	-36.59	0.13
	+12 34 53.255	-61 39 40.272	-224 mas	-672 mas	300.968799	1.147461			14	OH 300.969+1.147			1667	-38.97	4.34
	+12 34 53.2581	-61 39 40.251	-178 mas	-651 mas	300.968805	1.147468			15	OH 300.969+1.147			1667	-39.74	0.37
	+12 34 53.2734	-61 39 39.899	52 mas	-299 mas	300.968829	1.147567			16	OH 300.969+1.147			1667	-40.38	0.35
	+12 34 53.2873	-61 39 41.09	260 mas	-1490 mas	300.968878	1.147239			17	OH 300.969+1.147			1667	-41.25	0.35

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 'CAS09B' 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 'CAS09B' AND detected=true AND hide=false ORDER BY detected DESC,id

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CAS09B - Maser maps and magnetic field of OH 300.969+1.147

Interferometry data

View as list of objects

Detection table from Caswell et al. (2009)