FAUST - XV. A disc wind mapped by CH3OH and SiO in the inner 300 au of the NGC 1333 IRAS 4A2 protostar

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Table 1.

CH₃OH and SiO spectral and physical properties.

Line	Transition		Frequency	E_u	log(A_ul/s⁻¹)	g_u	Beam
			[GHz]	[K]			″ × ″(°)
SiO	5–4		217.10498	31	−3.28	11	0.18 × 0.11(−13)
CH₃OH	5_1, 4 − 4_1, 3 A		243.91579	50	−4.22	44	0.14 × 0.096 (−21)

	Velocity-integrated intensity (∫IΔv) ^(a) and Column density (N_col) ^(b)

Position	CH₃OH red peak		SiO red peak		CH₃OH blue peak		SiO blue peak
Offset ^(c)	$(- 1 \overset{″}{.} 35, + 1 ″)$ $(-1{{\overset{\prime\prime}{.}}}35, +1\prime\prime)$		$(- 1 \overset{″}{.} 27, + 0 \overset{″}{.} 93)$ $(-1{{\overset{\prime\prime}{.}}}27, +0{{\overset{\prime\prime}{.}}}93)$		$(- 1 \overset{″}{.} 41, + 1 \overset{″}{.} 13)$ $(-1{{\overset{\prime\prime}{.}}}41, +1{{\overset{\prime\prime}{.}}}13)$		$(- 1 \overset{″}{.} 44, + 1 \overset{″}{.} 19)$ $(-1{{\overset{\prime\prime}{.}}}44, +1{{\overset{\prime\prime}{.}}}19)$

	∫IΔv	N_col	∫IΔv	N_col	∫IΔv	N_col	∫IΔv	N_col
	[K km s⁻¹]	[cm⁻²]	[K km s⁻¹]	[cm⁻²]	[K km s⁻¹]	[cm⁻²]	[K km s⁻¹]	[cm⁻²]

SiO	44(6)	8.7(1.1)×10¹³	54(8)	10(2)×10¹³	51(8)	10(2)×10¹³	43(6)	8.5(1.1)×10¹³
CH₃OH	118(17)	37(5)×10¹⁵	37(6)	12(2)×10¹⁵	67(10)	21(3)×10¹⁵	52(8)	16(2)×10¹⁵

	∫IΔv	N_col	∫IΔv	N_col	∫IΔv	N_col	∫IΔv	N_col

CH₃OH/SiO	2.7(0.8)	420(110)	0.7(0.2)	120(40)	1.3(0.4)	210(70)	1.2(0.3)	190(50)

Notes. Top: spectral properties of CH₃OH and SiO by Xu et al. (2008) and Müller et al. (2013), respectively, from the CDMS database (Müller et al. 2005). Bottom: integrated area in the blue (from 0.8 to 4.8 km s⁻¹) and red (from 8.8 to 12.8 km s⁻¹) velocity ranges from the spectra extracted at the blueshifted and redshifted peaks of CH₃OH and SiO (see Figs. 1 and 2) and corresponding column densities.

^(a)

Errors on the integrated intensity include 15% of calibration error and spectral baseline determination.

^(b)

N_col has been computed assuming a T_ex of 100 K. A difference in T_ex of 50 K approximately translates into a factor of 2 in N_col.

^(c)

With respect to the map phase centre.

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