Table 3.
VLA observations of NGC 4565: observation, calibration, and imaging parameters.
| Frequency (a) | 1.5 GHz (L-band) | 6 GHz (C-band) | |||||
|---|---|---|---|---|---|---|---|
| Configuration | B | C | D | B+C+D | C | D | C+D |
| Obs. date | 2012/06/02–03 | 2012/04/02 | 2011/12/30 | N/A | 2012/04/16 | 2011/12/29 | N/A |
| Obs. time (b) | 125 min | 43 min | 19 min | N/A | 356 min | 76 min | N/A |
| Primary calibrator | 3C 286 | 3C 286 | 3C 286 | N/A | 3C 286 | 3C 286 | N/A |
| Secondary calibrator | J1221+2813 | J1221+2813 | J1221+2813 | N/A | J1221+2813 | J1221+2813 | N/A |
| bmaj [″] (c) | 3.31 | 10.49/12.00 | 34.50 | 10.16/12.00 | 2.63 | 9.02/12.00 | 3.57 |
| bmin [″] (c) | 3.01 | 10.01/12.00 | 32.32 | 9.40/12.00 | 2.59 | 8.82/12.00 | 3.52 |
| Beam position angle [°] | 45.50 | 64.64 | −89.06 | 47.75 | −61.72 | 85.48 | −83.98 |
| Pixel size [″] | 0.5 | 2.5 | 5 | 0.5 | 0.5 | 2.5 | 0.5 |
| Scales for MS-CLEAN [″] | 0, 6, 15 | 0, 10, 20 | 0, 35, 80 | 0, 6, 15, | 0, 5, 13 | 0, 10, 40 | 0, 5, 13 |
| 35, 70, 105 | |||||||
| Self-calibration | No | 1x amp+phase | 1x phase | N/A (d) | 1x phase | No | N/A (d) |
| Outer uv-taper [kλ] | − | − | − | 50 | − | − | 34 |
| Noise rms [μJy beam−1] | 14 | 20.5 | 34 | 20 | 3.2 | 7.4/7.0 (e) | 2.5 |
Notes.
The central frequency of the respective band is given. The total bandwidth is 512 MHz for L-band and 2.048 GHz for C-band.
Major- and minor-axis FWHM of the synthesised beam (the intermediate-resolution maps were smoothed to 12″ FWHM after deconvolution).
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