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Table 1

IRAS 4A: envelope continuum emission at 880 μm and derived parametersa.

α(J2000)b 3h29m10.520s
Tdustc 50 K

rmsI 20 mJy beam-1
rmsQ 2.5 mJy beam-1
rmsU 2.5 mJy beam-1

4.1 ± 0.4 Jy
1.03 ± 0.02 Jy beam-1
FWHMd 1156 AU ()

160 ± 16 mJy
38.2 ± 2.5 mJy beam-1
Ωpole 14 arcsec2

τ 0.07
NH2f 1.2 × 1024 cm-2
nH2f 1.1 × 108 cm-3
Massf 0.8 M



See Appendix A of Frau et al. (2010) for details.


From a 2D Gaussian fit to the source.


Diameter of the circle with the same area as the region of the source with intensity above half of the peak.


Solid angle of the region with polarized intensity above 3σ.


Assuming κ250   GHz = 1.5 cm2 g-1 and a gas-to-dust ratio of 100 (Girart et al. 2006).

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