J1744-3116 HCO+ (spw29) absorption calibration problem

[ashleythomasbarnes]

Splitting from #178 to help tracking of this specific issue

[ashleythomasbarnes]

Testing effect with and without the absorption feature flagged in #266

[ashleythomasbarnes]

Comparison of pipeline properties from weblogs

Property	With absorption feature	Without absorption feature
Phase calibrator calibration (spw 29)	———————————	———————————
Renormalization (X2d13, x822c)	1.030005, 1.029418	1.030005, 1.029418
Gfluxscale (mJy)	613.723	656.982

Property	With absorption feature	Without absorption feature
Phase calibrator imaging (spw 29)	———————————	———————————
Final theoretical sensitivity (mJy/beam)	0.24	0.26
Clean residual peak	4.56	4.08
Non-pbcor image RMS (mJy/beam)	0.26	0.3
Pbcor image max / min (mJy/beam)	611 / -1.02	653 / -0.953

Property	With absorption feature	Without absorption feature
Target imaging (spw 29)	———————————	———————————
Final theoretical sensitivity (mJy/beam)	10	10
Clean residual peak	-8.70	-8.69
Non-pbcor image RMS (mJy/beam)	10	10
Pbcor image max / min (mJy/beam)	882 / -223	883 / -223

[ashleythomasbarnes]

CONTINUUM

Summary -- differences in the continuum image - very minor but this is not surprising given that spw29 makes up only a small part of the continuum bandwidth

Cont emission map

Cont emission map difference

Cont emission map difference scatter plot

Cont emission map difference scatter plot - ratio of fractional difference on y-axis

Same as above but zoomed-in on y-axis

[ashleythomasbarnes]

LINE - SPW29 MOM0

Integrated intensity moment map - flagged absorption feature

Integrated intensity moment map - flagged absorption feature difference

Integrated intensity moment map - flagged absorption feature difference

[ashleythomasbarnes]

LINE - SPW29 MAX

Maximum moment map - flagged absorption feature

Maximum moment map - flagged absorption feature difference

Maximum moment map - flagged absorption feature difference