Comments (1)
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.
Related Issues (20)
- ngc4303 HOT 5
- ngc4569 HOT 4
- ngc4826 HOT 3
- ngc5128 HOT 2
- ngc5248 HOT 3
- tp - check for artefacts in single-dish image
- tp - check baseline of single-dish image
- tp - check baseline of single-dish image
- 7m - check for negative bowls in 7m image
- 7m - check for negative bowls in 7m image
- 7m - check for negative bowls in 7m image
- 7m+tp - check baseline of 7m image (i.e. in continuum subtraction okay?)
- 7m+tp - check for negative bowls in 7m image
- 7m+tp - check for negative bowls in 7m image
- 7m+tp - compare to the single dish image (fluxes okay?)
- Reverse velocity axis for CS cubes HOT 2
- Masking issues
- Negative bowls HOT 1
- Single dish issues
- Issues with non-standard fits information HOT 1
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