Deep low-frequency radio observations of the NOAO Boötes field - I. Data reduction and catalog construction

H. T. Intema; R. J. van Weeren; H. J. A. Röttgering; D. V. Lal

doi:10.1051/0004-6361/201014253

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Volume 535 (November 2011)

A&A, 535 (2011) A38

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Table 2

Overview of wide-field imaging parameters (upper panel) and SPAM parameters (lower panel).

Field diameter^a	6.8°
Pixel size	4″
Weighting^b	robust 0.5
Wide-field imaging^c^d	polyhedron (facet-based),
	multi-frequency synthesis
Number of facets	199
Facet diameter	0.57°
Facet separation	0.47°
Deconvolution^e	Cotton-Schwab CLEAN
CLEAN box threshold	5 σ
CLEAN depth	2 σ
Restoring beam	26″ × 22″ (PA 78°)


SPAM^f calibration cycles	2
Peeled sources^g	24
Layer heights (and weights)	100 km (0.25)
	200 km (0.50)
	400 km (0.25)
Parameter γ (^h)	5/3
Model parameters	20
Model fit phase rms^g	19.2° ± 3.0°
Peeling corrections applied	yes
Reference catalogⁱ	NVSS

Notes.

^(a)

We map more than twice the HPBW diameter to allow for deconvolution of nearby bright sources.

^(b)

Briggs (1995).

^(c)

Perley (1989); Cornwell & Perley (1992).

^(d)

Conway et al. (1990).

^(e)

Schwab (1984); Cotton (1999); Cornwell et al. (1999).

^(f)

Intema et al. (2009)

^(g)

Specified for the final (second) calibration cycle only.

^(h)

Power-law slope of the assumed phase structure function.

⁽ⁱ⁾

Condon et al. (1994, 1998).

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