Complex organics in IRAS 4A revisited with ALMA and PdBI: Striking contrast between two neighbouring protostellar cores

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Volume 606 (October 2017)

A&A, 606 (2017) A121

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Table 1

Dust continuum parameters of IRAS 4 A1 and A2.

ALMA 1.2 mm

	A1	A2

RA (J2000)	03^h29^m10.539^s	03^d29^m10.434^s
Dec (J2000)	+31°13′30.92′′	+31°13′32.15′′
Size (′′)^a	1.0 × 0.8	1.4 × 0.8
PA (°)^a	36	137
S_ν (Jy)^a	1.99 ± 0.20	1.15 ± 0.12
S_ν,peak (mJy beam^-1)	542 ± 55	279 ± 28
M_gas (M_⊙)	0.09–0.51	0.06–0.29
N_H₂,peak (10²⁴ cm^-2)^b	5.7–31	2.9–16

PdBI 2.7 mm

	A1	A2

RA (J2000)	03^h29^m10.536^s	03^d29^m10.428^s
Dec (J2000)	+31°13′31.07′′	+31°13′32.27′′
Size (′′)^a	1.3 × 0.9	1.8 × 1.3
PA (°)^a	29	137
S_ν (Jy)^a	0.345 ± 0.20	0.162 ± 0.12
S_ν,peak (mJy beam^-1)	167 ± 17	46 ± 5
M_gas (M_⊙)	0.37–1.9	0.17–0.88
N_H₂,peak (10²⁴ cm^-2)^b	7.7–40	2.1–11

Notes.Masses and H₂ column densities derived for a dust temperature range of 50–200 K.

^(a)

Deconvolved source sizes, coordinates, and fluxes from 2D Gaussian fits.

^(b)

Beam-averaged H₂ column densities at each peak position.

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