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CHO12 - Water and Methanol Maser Activities in the NGC 2024 FIR 6 Region

Short title: Choi et al. (2012)
Authors: Choi, Minho Kang, Miju Byun, Do-Young Lee, Jeong-Eun
Journal: The Astrophysical Journal, Volume 759, Issue 2, article id. 136, 7 pp. (2012).
Bibcode:

Target type: High_mass_SFR
Transitions: CH3OH_36(I),CH3OH_44(I),CH3OH_95(I),CH3OH_132(I)

Abstract
The NGC 2024 FIR 6 region was observed in the water maser line at 22 GHz and the methanol class I maser lines at 44, 95, and 133 GHz. The water maser spectra displayed several velocity components and month-scale time variabilities. Most of the velocity components may be associated with FIR 6n, while one component was associated with FIR 4. A typical lifetime of the water maser velocity components is about eight months. The components showed velocity fluctuations with a typical drift rate of about 0.01 km s^-1 day^-1. The methanol class I masers were detected toward FIR 6. The methanol emission is confined within a narrow range around the systemic velocity of the FIR 6 cloud core. The methanol masers suggest the existence of shocks driven by either the expanding H II region of FIR 6c or the outflow of FIR 6n. eprintid: arXiv:1209.5487	Target sources: 6.9mm continuum source FIR 6c (Choi et al. 2012) Comments: Methanol observations of NGC 2024 FIR 6 region

Abstract

The NGC 2024 FIR 6 region was observed in the water maser line at 22 GHz and the methanol class I maser lines at 44, 95, and 133 GHz. The water maser spectra displayed several velocity components and month-scale time variabilities. Most of the velocity components may be associated with FIR 6n, while one component was associated with FIR 4. A typical lifetime of the water maser velocity components is about eight months. The components showed velocity fluctuations with a typical drift rate of about 0.01 km s^-1 day^-1. The methanol class I masers were detected toward FIR 6. The methanol emission is confined within a narrow range around the systemic velocity of the FIR 6 cloud core. The methanol masers suggest the existence of shocks driven by either the expanding H II region of FIR 6c or the outflow of FIR 6n. eprintid:

Target sources:
6.9mm continuum source FIR 6c (Choi et al. 2012)

Comments:
Methanol observations of NGC 2024 FIR 6 region

Input tables: Table 4, 5
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Detection table from Choi et al. (2012)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	V_range	V_peak	F_peak	∫F dv	RMS	List	Detection	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			(km/s)	(km/s)	(Jy)	(Jy*km/s)	(Jy)		Yes/No
1	17 34 10.8	-15 33 02	10.0403	9.2851	G10.040+9.285	IRAS 17313-1531		-55.6	1.501	35.98	0.231	ENG_H2O	+H₂O +OH +SiO	CHO12
2	06 02 32.3	+74 30 27.1	139.3942	22.8971	G139.394+22.897	V Cam		6.4	1.328	57.474	0.221	ENG_H2O	+H₂O -OH +SiO	CHO12
3	06 42 15.3	-09 39 44.3	220.5285	-6.4120	G220.528-6.412	GS Mon		29.3	4.649	85.39	0.221	ENG_H2O	+H₂O -OH +SiO	CHO12
4	07 04 29.9	-08 57 09	222.3819	-1.1967	G222.385-1.193	HN Mon		71.5	3.432	39.411	0.221	ENG_H2O	+H₂O -OH +SiO	CHO12
5	07 17 5.8	-34 49 39.7	246.9261	-10.2997	G246.926-10.300	V578 Pup		-23.8	5.646	36.127	0.221	ENG_H2O	+H₂O +OH +SiO	CHO12
6	07 17 27.8	-24 17 12	237.4545	-5.4873	G237.455-5.487	IRAS 07153-2411		50.1	5.092	68.148	0.221	ENG_H2O	+H₂O -CH₃OH II -OH +SiO	CHO12
7	07 35 04	-23 59 14.9	239.0907	-1.8061	G239.093-1.805	DU Pup		58.1	5.867	143.686	0.221	ENG_H2O	+H₂O +OH +SiO	CHO12
8	08 09 39.8	-38 10 28.4	255.0620	-2.7300	G255.062-2.730	AS Pup		-31.9	10.184	86.211	0.221	ENG_H2O	+H₂O +SiO	CHO12
9	16 33 43.5	-16 07 54.3	0.9419	20.8957	G0.942+20.895	T Oph		-31.0	9.41	87.033	0.221	ENG_H2O	+H₂O +OH +SiO	CHO12
10	16 46 39.1	-11 38 53.1	6.7995	21.0655	G6.800+21.064	V446 Oph		10.0	4.428	114.128	0.221	ENG_H2O	+H₂O -OH +SiO	CHO12
11	18 29 28.7	-12 37 56	19.2086	-0.9532	G19.209-0.953	V435 Sct		62.0	1.218	13.958	0.221	ENG_H2O	+H₂O +OH +SiO	CHO12
12	18 47 50	-09 19 22	24.2166	-3.4430	G24.217-3.443	IRAS 18450-0922		-38.7	1.328	32.021	0.221	ENG_H2O	+H₂O -CH₃OH II +OH +SiO	CHO12
13	18 50 4.8	+05 59 32	38.1156	3.0293	G38.116+3.029	IRAS 18476+0555		41.2	4.871	124.801	0.221	ENG_H2O	+H₂O +OH +SiO	CHO12
14	18 53 9.1	-21 28 31.6	13.8088	-9.9700	G13.809-9.971	V2059 Sgr		59.1	1.328	15.6	0.221	ENG_H2O	+H₂O +OH +SiO	CHO12
15	18 54 47.4	+00 25 26.6	33.6915	-0.5525	G33.691-0.553	IRC+00392	17.2	107.6	11.734	154.36	0.221	ENG_H2O	+H₂O -OH +SiO	CHO12

Non-detection table from Choi et al. (2012)