Table 2
Model fits to IRC+10216’s 43.3 GHz brightness distribution.
| Restoring beam | Deconvolved source | |||||||
| M | θ B,maj | θ B,min | PA(B) | θ S,maj | θ S,min | PA(S) | S p | ∫SdΩ |
| (mas) | (mas) | (°, E of N) | (mas) | (mas) | (°, E of N) | (mJy beam-1) | (mJy) | |
|
|
||||||||
| Imaging with natural weighting – Gaussian model | ||||||||
| J | 61 | 49 | −6.3 | 60 ± 2 | 54 ± 2 | +34 ± 17 | 6.22 ± 0.07 | 13.1 ± 0.2 |
| 13.1 ± 0.2 | 2630 | |||||||
| Imaging with uniform weighting – Gaussian model | ||||||||
| J | 44 | 39 | −6.8 | 63 ± 2 | 57 ± 2 |
|
4.30 ± 0.09 | 13.2 ± 0.4 |
| 13.3 ± 0.3 | 2450 | |||||||
| Visibility versus uv-distance – Gaussian modeling | ||||||||
| O | – | – | – | 61 ± 1 | 55 ± 3 | +31 ± 13 | – | 12.8 ± 0.2 |
| L | – | – | – | 56 ± 2 | – | – | – | 12.6 ± 0.3 |
| Visibility versus uv-distance – uniform disk modeling | ||||||||
| O | – | – | – | 87 ± 2 | 80 ± 1 | +22 ± 5 | – | 12.2 ± 0.1 |
| L | – | – | – | 83 ± 1 | – | – | – | 12.1 ± 0.2 |
Notes. The first four lines give results of Gaussian fitting, line 1 and 2 to a naturally weighted image and a uniformly weighted image, line 3 and 4 to visibility domain data. Lines 5 and 6 give the results for fits with a uniform disk model. The first column denotes the method (M) used: J for JMFIT and O for OMFIT (AIPS tasks). L stand for our independent least-squares program. For the first two lines, the second to forth columns give the FWHM major and minor axes and the position angle of the restoring beam determined by IMAGR, while the fifth to seventh columns list the same quantities for IRC+10216’s brightness distribution and the eighth column gives fitted peak brightness. For all fits, the ninth gives the integrated flux density (the “zero spacing” flux). JMFIT and OMFIT fitted elliptical brightness models, whereas our least squares program used a circular model.
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