CHANG-ES - XIV. Cosmic-ray propagation and magnetic field strengths in the radio halo of NGC 4631

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Volume 632 (December 2019)

A&A, 632 (2019) A10

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Table 2.

Details of VLA observations of NGC 4631.

Frequency band	C-band		L-band

Array configuration	C	D	B	C	D
Center frequency	5.99 GHz		1.57 GHz
Bandwidth ^(a)	2.0 GHz		0.5 GHz
Spectral resolution ^(b)	4.0 MHz		0.5 MHz
Observing date	06/04/2012	29/12/2011	03/06/2012	02/04/2012	30/12/2011
Pointings	2 ^(c)		1 ^(d)
Observing time ^(e)	6 h	75 min	2 h	77 min	18 min
Primary calibrator	3C 286		3C 286
Secondary calibrator	J1221+2813	J1310+3220	J1221+2813
Polarization leakage calibrator	OQ208	J1310+3220	OQ208
Restoring beam ^(f)
rms Stokes I [μJy beam⁻¹] ^(g)	2.75	7.7	16	26	31
rms Stokes Q & U [μJy beam⁻¹] ^(g)	2.84	6.9	–	21	28

Notes.

^(a)

Bandwidth before flagging. At C-band the data cover 16 spectral windows (spws), i.e., 1024 spectral channels. At L-band, the data cover 32 spws (2048 spectral channels).

^(b)

After Hanning smoothing.

^(c)

Pointing 1: , . Pointing 2: , .

^(d)

Pointing: , .

^(e)

On-source observing time before flagging. At C-band, values represent the total observing time for both pointings.

^(f)

Image results with Briggs weighting (robust = 0).

^(g)

All rms values were extracted from non-PB corrected images. At C-band, the rms was estimated from the mosaicked images by averaging the noise in areas observed with only one pointing and also in areas where both pointings overlap.

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