ngc1365 about phangs HOT 1 OPEN

HCN

• TP: Very strong emission with spatial structure. No important stripes. Baseline shapes are mostly OK, but their zero level is offsets at some locations. This might improve. Flux ~ 115 Jy*km/s.
• 7m image: Very strong emission, a resolved disk. The cube looks OK. Some reasonable negative sidelobes at spots near the emission region. Flux ~ 114 Jy*km/s (nominally comparable to the TP one). Beam ~ 19.7" x 10.9" (quite elongated!).
• 7m mask: Reasonable. It follows the emission, including some extended/peripheral features not detected in HCN. On the other hand, it's a bit tight near some edges of the emission, but not worrying.
• 7m residuals: Nothing to report. Noise spectra + usual low-level truncation. No signs of emission left over. Nominal flux ~ 0.18 units*km/s.
• 7m+TP image (round): Looks mostly fine. There are still some narrow, negative sidelobes in channels with strong emission (see below). Flux ~ 118 Jy*km/s.

HCO+

• TP: Flux ~ 85 Jy*km/s. The baseline are somewhat worser than the HCN ones, in particular close to the edges (offset + slight bowling).
• 7m image: A bit weaker than HCN, but very similar. Some baseline offsets found, but doesn't seem to be a general issue. Flux ~ 93 Jy*km/s (nominally higher than the TP one!). Beam ~ 18.9" x 10.7".
• 7m mask: Similar to HCN.
• 7m residuals: Similar to HCN.
• 7m+TP (round): Similar to HCN; bowling seems attenuated wrt 7m alone. Flux ~ 98. Jy*km/s. This is gormally higher than TP or 7m alone, bur this required a more detailed inspection; in practice, 7m and 7m+TP have virtually the same flux and spectra if estimated on matched apertures.

CS

• TP: Nothing terrible, but not very convincing. Baselines have some offsets and bowlings, resulting in the positively-skewed mom0 map below. It's possible that things look worse than in HCN and HCO+ simply b/c CS is fainter. Flux ~ 41 Jy*km/s.

Integrated over 1400-1850 km/s; real emission expected within the larger polygon; scale saturated to appreciate noise.

• 7m image: Fainter than the two above, but very solid detection. Some sidelobes near the emission region again. Flux ~ 37 Jy*km/s.
• 7m mask: nothing to report. It looks less tight b/c of the emission being fainter.
• 7m residuals: OK.
• 7m+TP (round): Overall fine, although some artifacts near emission are not corrected by feathering (see offset baseline below). Flux ~ 35 Jy*km/s (on matched aperture, there's little change wrt 7m alone).

from phangs.