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JOH14 - Detection of Water Masers toward Young Stellar Objects in the Large Magellanic Cloud

Interferometry data

Short title: Johanson et al. (2014)
Authors: Johanson, A. K.Migenes, V.Breen, S. L.
Journal: The Astrophysical Journal, Volume 781, Issue 2, article id. 78, 6 pp. (2014).
Bibcode:

Target type: YSO,Extragalactic
Transitions: H2O_22

Abstract
We present results from a search for water maser emission toward N4A, N190, and N206, three regions of massive star formation in the Large Magellanic Cloud (LMC). Four water masers were detected two toward N4A, and two toward N190. In the latter region, no previously known maser emission has been reported. Future studies of maser proper motion to determine the galactic dynamics of the LMC will benefit from the independent data points the new masers in N190 provide. Two of these masers are associated with previously identified massive young stellar objects (YSOs), which strongly supports the authenticity of the classification. We argue that the other two masers identify previously unknown YSOs. No masers were detected toward N206, but it does host a newly discovered 22 GHz continuum source, also associated with a massive YSO. We suggest that future surveys for water maser emission in the LMC be targeted toward the more luminous, massive YSOs.

Abstract

We present results from a search for water maser emission toward N4A, N190, and N206, three regions of massive star formation in the Large Magellanic Cloud (LMC). Four water masers were detected two toward N4A, and two toward N190. In the latter region, no previously known maser emission has been reported. Future studies of maser proper motion to determine the galactic dynamics of the LMC will benefit from the independent data points the new masers in N190 provide. Two of these masers are associated with previously identified massive young stellar objects (YSOs), which strongly supports the authenticity of the classification. We argue that the other two masers identify previously unknown YSOs. No masers were detected toward N206, but it does host a newly discovered 22 GHz continuum source, also associated with a massive YSO. We suggest that future surveys for water maser emission in the LMC be targeted toward the more luminous, massive YSOs.

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Detection table from Johanson et al. (2014)

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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	Configuration	V_step	RMS	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(mas)	(mas)	(deg.)	(deg.)						H₂O	(km/s)	(mJy/beam)			(km/s)	(mJy/beam)	Yes/No		(kpc)
1	+04 52 9.1	-66 55 14.8			277.947922	-36.369191	G277.949-36.371		N4A	Image	Descr	22 GHz;	258.4 .. 272.5	230 .. 431	ATCA	1.5D	0.224	7.000	+H₂O -OH	MIXED		2008 Mar
	+04 52 5.24	-66 55 13.9	-57901.2 mas	900.8 mas	277.949847	-36.375307		1	N4A				262.5	230 (15)
	+04 52 9.05	-66 55 22.5	-751.2 mas	-7699.2 mas	277.950498	-36.368662		2	N4A				259.9	261 (10)
	+04 52 9.07	-66 55 22.6	-451.2 mas	-7799.2 mas	277.950520	-36.368623		3	N4A				258.4	431 (30)
	+04 52 9.21	-66 55 22.2	1648.8 mas	-7399.2 mas	277.950307	-36.368435		4	N4A				272.5	275 (24)
2	+05 04 25.4	-70 43 49.2			282.048707	-34.239427	G282.046-34.240		N190	Image	Descr	22 GHz;	231.5	1271 .. 1615	ATCA	1.5D	0.224	7.000	+H₂O	MIXED		2008 Mar
	+05 04 24.98	-70 43 42.9	-6298.8 mas	6298.8 mas	282.046864	-34.240464		1	N190				231.5	1271 (132)
	+05 04 25.44	-70 43 41.6	601.2 mas	7598.8 mas	282.046234	-34.239956		2	N190				231.5	1615 (159)

Non-detection table from Johanson et al. (2014)