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

Free Access

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).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.