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Table 1

Parameters of JVLA observations toward NGC 7538 IRS1.

Transitiona νrest El/kb Date JVLA Synthesized beam RMSc
(J, K) (MHz) (K) (yyyy-mmm-dd) Receiver θM(′′) × θm(′′); PA(°) (mJy/beam)
(6, 6) 25 055.96 408 2012-May-31 K 0.26 × 0.23; + 45 1.3
(7, 7) 25 715.14 538 2012-May-31 K 0.25 × 0.22; + 45 1.5
(9, 9) 27 477.94 852 2012-Jun.-21 Ka 0.23 × 0.21; + 30 2.3
(10, 10) 28 604.75 1035 2012-Aug.-07 Ka 0.22 × 0.20; + 40 3.3
(12, 12) 31 424.94 1455 2013-Dec.-21 Ka 0.33 × 0.21; − 76 5.5d
(13, 13) 33 156.84 1691 2012-Jun.-21 Ka 0.19 × 0.17; +35 2.3
(14, 14) 35 134.28 1945 2013-Dec.-21 Ka 0.30 × 0.19; −76 6.0d
Other molecular transitions
CH3OHe 27 472.53 234 2012-Jun.-21 Ka 0.22 × 0.20; +30 2.4
CH3CNf 36 793.71 10 2012-Aug.-07 Ka 0.18 × 0.15; +3 4.0

Notes.

(a)

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

(b)

Energy above the ground from the JPL database.

(c)

RMS noise in a ~0.4 km s-1 channel.

(d)

The rms noise in the maps of transitions (12, 12) and (14, 14) is higher than other lines, because only 7 min on-source were spent in December 2013 (53 min were typically spent in the 2012 tracks). In order to boost sensitivity, in imaging the (12, 12) and (14, 14) lines we used natural weighting (as opposed to Briggs weighting), which resulted in slightly larger beams.

(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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