Discovery of non-metastable ammonia masers in Sagittarius B2

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Volume 666 (October 2022)

A&A, 666 (2022) L15

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Table B.6.

NH₃ maser positions in Sgr B2, derived from the JVLA observations.

Transition		RA	Dec	S_ν	T_MB	V_LSR	ΔV_1/2
		(h m s)	(° ′ ″)	(Jy beam⁻¹)	(10⁴ K)	(km s⁻¹)
(6,3)	63A⁺	17 47 20.005 ± 0.003	−28 22 17.285 ± 0.009	0.058	1.026	62.09 ± 0.02	0.60 ± 0.04
	63B⁺	17 47 19.918 ± 0.002	−28 22 17.037 ± 0.008	0.085	1.503	68.94 ± 0.01	0.40 ± 0.02
	63C^x	17 47 20.036 ± 0.001	−28 22 41.135 ± 0.004	0.114	2.028	57.26 ± 0.01	0.49 ± 0.01
	63D^*	17 47 20.200 ± 0.002	−28 23 06.500 ± 0.008	0.019	0.345	69.02 ± 0.12	1.14 ± 0.12
				0.048	0.850	70.22 ± 0.12	0.62 ± 0.12
				0.027	0.470	71.00 ± 0.12	0.48 ± 0.12
				0.098	1.720	71.80 ± 0.12	0.44 ± 0.12
				0.102	1.774	72.68 ± 0.12	0.75 ± 0.12
(7,4)	74A⁺	17 47 20.005 ± 0.001	−28 22 17.255 ± 0.002	0.381	6.771	62.58 ± 0.002	0.37 ± 0.005
	74B^*	17 47 20.200 ± 0.001	−28 23 06.512 ± 0.005	0.125	2.219	72.55 ± 0.006	0.72 ± 0.02
	74C^**	17 47 20.471 ± 0.001	−28 23 45.783 ± 0.005	0.177	3.144	77.41 ± 0.004	0.54 ± 0.01
(8,5)	85A⁺	17 47 19.862 ± 0.003	−28 22 18.254 ± 0.011	0.019	0.340	54.32 ± 0.06	0.88 ± 0.17
				0.019	0.350	55.14 ± 0.04	0.34 ± 0.07
				0.041	0.742	56.52 ± 0.04	2.12 ± 0.14
	85B^*	17 47 20.118 ± 0.005	−28 23 06.230 ± 0.015	0.024	0.444	70.95 ± 0.04	0.95 ± 0.08
(9,6)	96A⁺	17 47 19.876 ± 0.002	−28 22 17.903 ± 0.009	0.070	1.207	77.92 ± 0.02	0.94 ± 0.05
	96B⁺	17 47 19.855 ± 0.003	−28 22 17.977 ± 0.010	0.083	1.416	63.78 ± 0.01	0.82 ± 0.03
	96C^*	17 47 20.200 ± 0.001	−28 23 06.511 ± 0.005	0.217	3.712	71.24 ± 0.13	0.73 ± 0.13
				3.211	55.15	72.48 ± 0.13	0.56 ± 0.13
				1.208	20.59	73.24 ± 0.13	0.59 ± 0.13
	96D^**	17 47 20.471 ± 0.002	−28 23 45.763 ± 0.008	0.172	3.214	77.38 ± 0.01	0.66 ± 0.03
				0.066	1.097	78.20 ± 0.09	1.27 ± 0.14
				0.079	1.378	82.60 ± 0.01	0.81 ± 0.03
				0.064	1.086	83.52 ± 0.01	0.90 ± 0.06
(10,7)	107A⁺	17 47 19.859 ± 0.002	−28 22 12.925 ± 0.010	0.069	1.257	65.55 ± 0.02	0.57 ± 0.04
	107B⁺	17 47 19.259 ± 0.001	−28 22 14.724 ± 0.003	3.710	67.17	81.98 ± 0.001	0.96 ± 0.002
				0.263	4.770	86.35 ± 0.01	0.60 ± 0.02
	107C⁺	17 47 19.862 ± 0.003	−28 22 18.257 ± 0.011	0.041	0.751	55.08 ± 0.03	1.39 ± 0.10
				0.029	0.520	56.36 ± 0.03	0.46 ± 0.07
				0.053	0.961	57.24 ± 0.03	1.21 ± 0.09
	107D^*	17 47 20.117 ± 0.002	−28 23 06.216 ± 0.006	0.165	2.967	69.48 ± 0.13	0.72 ± 0.13
				0.139	2.706	70.23 ± 0.13	0.61 ± 0.13
				0.137	2.446	70.89 ± 0.13	0.69 ± 0.13
	107E^**	17 47 20.471 ± 0.002	−28 23 45.779 ± 0.007	0.123	2.224	78.42 ± 0.01	1.25 ± 0.02

Notes.

⁺

These nine maser spots originate in Sgr B2(N).

63C arises in Sgr B2(NS).

These five maser sources belong to Sgr B2(M).

^**

These three maser spots originate in Sgr B2(S). The flux density scale calibration accuracy is estimated to be within 15%.

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