Table 1.
Summary of the JVLA observations.
| Transition | ν | Elow/k | Baseband | Synthesized beam | Linear resolution | PA | rms | |
|---|---|---|---|---|---|---|---|---|
| (J, K) | (GHz) | (K) | (arcsec) | (au) | (deg) | (K mJy−1) | (mJy beam−1) | |
| (5,1) | 19.838346 | 422 | A0/C0 | 0.198 × 0.085 | 1624 × 697 | −9.807 | 184 | 3.32 |
| (6,3) | 19.757538 | 551 | A0/C0 | 0.203 × 0.087 | 1665 × 713 | −9.806 | 177 | 4.30 |
| (7,4) | 19.218465 | 713 | A0/C0 | 0.209 × 0.089 | 1714 × 730 | −9.661 | 178 | 3.85 |
| (8,5) | 18.808507 | 892 | B0/D0 | 0.214 × 0.091 | 1755 × 746 | −9.527 | 177 | 3.54 |
| (9,6) | 18.499390 | 1089 | B0/D0 | 0.215 × 0.097 | 1763 × 795 | −7.385 | 171 | 3.79 |
| (10,7) | 18.285434 | 1303 | B0/D0 | 0.220 × 0.094 | 1804 × 771 | −9.874 | 177 | 2.95 |
Notes. Columns (1) and (2): observed lines and corresponding rest frequencies, taken from Henkel et al. (2013). Column (3): Elow/k: energy above the ground state of the lower level of a given inversion doublet; k is the Boltzmann constant; (Eup − Elow)/k ∼ 1.0–1.5 K. Column (4): baseline board pairs’ setup, see details in VLA resources page. Column (5): synthesized beam. Column (6): linear resolution at a distance of 8.2 kpc. Column (7): position angle of the synthesized beam. Column (8): conversion factor from mJy to Kelvin for each transition was calculated with 1.222 × 103/(ν2θmajθmin), where ν is the frequency in units of GHz; θmaj and θmin are the major and minor axis of the synthesized beam in units of arcseconds (https://science.nrao.edu/facilities/vla/proposing/TBconv). Column (9): rms noise in a channel image.
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