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Table 1

Parameters of JVLA observations toward W51.

Transitiona νrest Eu/kb Date JVLA Beamwidthc RMSd
(J,K) (MHz) (K) (yyyy-mmm-dd) receiver θM(′′) × θm(′′); PA(°) (mJy/beam)
NH3
(6, 6) 25 055.96 408 2012-May-31 K 0.29 × 0.23; −17 1.5
(7, 7) 25 715.44 539 2012-May-31 K 0.28 × 0.23; −2 1.6
(9, 9) 27 477.94 853 2012-Jun-21 Ka 0.24 × 0.22; + 53 1.3
(10, 10) 28 604.75 1035 2012-Aug-07 Ka 0.23 × 0.21; + 61 2.9
(13, 13) 33 156.84 1691 2012-Jun-21 Ka 0.20 × 0.18; + 52 1.9
Other molecular transitions
CH3OHe 27 472.53 234 2012-Jun-21 Ka 0.24 × 0.22; + 53 1.3
CH3CNf 36 793.71 10 2012-Aug-07 Ka 0.18 × 0.16; + 67 3.7

Notes.

(a)

Transitions include ortho-NH3 (K = 3n) and para-NH3 (K ≠ 3n).

(b)

Energy above the ground reported from the JPL database.

(c)

Synthesized beams in images made with the CASA task CLEAN with a robust parameter set to 0.5.

(d)

RMS noise in a 0.4 km s-1 channel without primary beam correction. After primary beam correction, the noise level increases by up to 25%.

(e)

The JK= 132–131 line of CH3OH was detected in the same baseband as the NH3 (9, 9) line.

(f)

The CH3CN (2-1) line was observed in a separated baseband paired with the NH3 (10, 10) line, but was not detected.

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