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Table 2.

VLA observations of NGC 891: 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 2012/06/24 2012/02/11 2011/12/16 N/A 2012/02/06–07 2011/12/09 N/A
2012/04/01 2013/03/17 2011/12/18
Obs. time (b) 121 min 47 min 30 min N/A 368 min 79 min N/A
Primary calibrator 3C 48 3C 48 3C 48 N/A 3C 48 3C 48 N/A
Secondary calibrator J0230+4032 J0314+4314 J0314+4314 N/A J0251+4315 J0230+4032 N/A
bmaj [″] (c) 3.16 10.64/12.00 36.42 4.09/12.00 2.77 9.00/12.00 3.88
bmin [″] (c) 2.90 9.66/12.00 32.48 3.73/12.00 2.61 8.81/12.00 3.50
Beam position angle [°] 54.22 88.06 −74.29 50.65 85.93 −79.46 80.49
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, 40 0, 20, 100, 200 0, 6, 15, 0, 6, 14 0, 10, 20, 40 0, 6, 15
50, 100, 200
Self-calibration 1x phase No No N/A (d) 1x amp+phase 1x amp+phase N/A (d)
Outer uv-taper [kλ] − − − 30 − − 34
Noise rms [μJy beam−1] 16 28 60 14.5/24 (e) 3.1 6.5/5.9 (e) 2.7

Notes.

(a)

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.

(b)

On-source time (before flagging).

(c)

Major- and minor-axis FWHM of the synthesised beam (the intermediate-resolution maps were smoothed to 12″ FWHM after deconvolution).

(d)

N/A in this case means that the specified self-calibrations were already applied to the single-array data sets before producing the combined-array images.

(e)

Noise rms before and after smoothing the map to 12″ FWHM.

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