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Table 2

SMA observational parameters

Parameter Value

Configurations 3 × compact and
1 × subcompact
Primary beam HPBW (arcsec) 55
Grid spacing (arcsec) 25
Synthesized beam HPBW (arcsec) 3.0
Equivalent frequency (GHz) 225
Total continuum bandwidth (GHz) 3.6
Projected base line range (kλ) 5.1–56.0
Maximum detectable structure (arcsec)a 32
Gain calibrators 0530+135, 0541-056
and 0607-085
Bandpass calibrator 3C 454.3 and 3C 273
Flux calibrators Uranus
rms noise level (mJy beam-1) ~11



Our observations were insensitive to more extended emission than this size-scale structure at the 10% level (Wilner & Welch 1994).

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