the Extensive Database of Astrophysical Maser Sources

Data:

PIH11 - Expanded Very Large Array Detection of 44.1 GHz Class I Methanol Masers in Sagittarius A

Interferometry data

Short title: Pihlstrom et al. (2011)
Authors: Pihlstrom, Y. M. Sjouwerman, L. O. Fish, V. L.
Journal: The Astrophysical Journal Letters, Volume 739, Issue 1, article id. L21, 6 pp. (2011).
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Abstract
We report on the detection of 44 GHz Class I methanol (CH₃OH) maser emission in the Sagittarius A (Sgr A) complex with the Expanded Very Large Array (EVLA). These EVLA observations show that the Sgr A complex harbors at least four different tracers of shocked regions in the radio regime. The 44 GHz masers correlate with the positions and velocities of previously detected 36 GHz CH₃OH masers, but less with 1720 MHz OH masers. Our detections agree with theoretical predictions that the densities and temperatures conducive for 1720 MHz OH masers may also produce 36 and 44 GHz CH₃OH maser emission. However, many 44 GHz masers do not overlap with 36 GHz methanol masers, suggesting that 44 GHz masers also arise in regions too hot and too dense for 36 GHz masers to form. This agrees with the non-detection of 1720 MHz OH masers in the same area, which are thought to be excited under even cooler and less dense conditions. We speculate that the geometry of the 36 GHz masers outlines the current location of a shock front. eprintid: arXiv:1105.4377

ID	Obs. RA	Obs. Dec	RA offset	Dec offset	l	b	#	Location	Source name	Image	Line	V_peak	F_peak	∫F dv	Telescope	Beam
	(J2000)	(J2000)	(arcsec)	(arcsec)	(deg.)	(deg.)					CH₃OH (class I)	(km/s)	(Jy/beam)	(Jy/beam*km/s)		(arcsec)
1	+17 45 38.92	-29 00 21			359.943809	-0.041648			Sgr A	Image	44 GHz (I)		0.13 .. 2.42	..	NRAOVLA	1.3 x 0.5
	+17 45 38.92	-29 00 21	0 mas	0 mas	359.943809	-0.041648	1	Calibrator	Sgr A			44	0.13
	+17 45 43.94	-29 00 19.5	75.2988	1.4988	359.953693	-0.057047	2	C	Sgr A			Calibrator	2.1
	+17 45 49.36	-28 58 53.3	156.599	87.6988	359.984421	-0.061441	3	E	Sgr A			45.2	0.93
	+17 45 49.56	-28 59 0.6	159.599	80.3988	359.983070	-0.063119	4	E	Sgr A			46.5	1.43
	+17 45 49.67	-28 58 55.2	161.249	85.7988	359.984559	-0.062681	5	E	Sgr A			42.7	2.42
	+17 45 49.89	-28 59 4.5	164.549	76.4988	359.982771	-0.064710	6	E	Sgr A			36.9	1.47
	+17 45 50.48	-29 00 05	173.399	15.9988	359.969542	-0.075296	7	D	Sgr A			49.9	0.55
	+17 45 50.48	-28 58 48.7	173.399	92.2988	359.987638	-0.064261	8	E	Sgr A			59.5	0.5
	+17 45 50.49	-28 59 7.6	173.549	73.3988	359.983174	-0.067026	9	E	Sgr A			42.8	0.45
	+17 45 50.65	-28 59 8.8	175.949	72.1988	359.983193	-0.067697	10	E	Sgr A			28	0.74
	+17 45 51.41	-28 59 10.2	187.349	70.7988	359.984303	-0.070264	11	E	Sgr A			44.2	0.45
	+17 45 51.55	-28 58 53.7	189.449	87.2988	359.988482	-0.068314	12	E	Sgr A			46.7	0.51
	+17 45 51.62	-28 58 26.5	190.499	114.499	359.995066	-0.064599	13	E	Sgr A			52.7	0.56
	+17 45 51.88	-28 58 52.9	194.399	88.0988	359.989298	-0.069225	14	E	Sgr A			47.1	2.39
	+17 45 52.12	-28 58 55.4	197.999	85.5988	359.989161	-0.070334	15	E	Sgr A			45.9	0.64
	+17 45 52.16	-28 58 22.3	198.599	118.699	359.997087	-0.065672	16	E	Sgr A			55.4	1.11
	+17 45 52.43	-28 58 58.2	202.649	82.7988	359.989085	-0.071703	17	E	Sgr A			43.7	0.58
	+17 45 52.55	-28 58 56.8	204.449	84.1988	359.989644	-0.071874	18	E	Sgr A			45.7	0.6

IRAS source	IRAS coordinates (RA, Dec)	IRAS flux density (F12,F25,F60,F100)
2MASS source	2MASS coordinates (RA, Dec)	2MASS magnituted (J,H,K)

Variable star	Variable star parameters	Star Formation Region name	Star Formation Region parameters
WISE source	WISE coordinates (RA, Dec)	WISE magnitudes (w1, w2, w3, w4)
Akari IRC source	Akari IRC coordinates (RA, Dec)	Akari IRC fluxes (S09, S18)
Akari FIS source	Akari FIS coordinates (RA, Dec)	Akari FIS fluxes (S65, S90, S140, S160)

DSS (optical)	2MASS (JHK)	WISE (4-22 um)	IRAC (3-8 um)	GLIMPSE 360 (3.6-4.5 um)	PACS color (70-160 um)	SPIRE color (250-500 um)
AKARI color (60-160 um)	NVSS (1.4 GHz)	SDSS (optical+NIR)	Image size: arcsec (default is 120 arcsec)
			Image size: arcsec (default is 120 arcsec)

Display data from paper

PIH11 - Expanded Very Large Array Detection of 44.1 GHz Class I Methanol Masers in Sagittarius A

Interferometry data

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Detection table from Pihlstrom et al. (2011)