[PIPE2D-1004] Calibrations questions Created: 15/Mar/22  Updated: 13/Jan/23

Status: Open
Project: DRP 2-D Pipeline
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Normal
Reporter: vlebrun Assignee: Unassigned
Resolution: Unresolved Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified


 Description   

When examining the new features to be included in the future release, some questions came up about two lambda and flux calibration parts, namely at which stage (1D or 2D) shall be done the following (if needed) :

  • The Milky Way ISM absorption. If not taken into account in the 2D calibration, we have to apply it in the 1D to get a better estimation of the continuum shape
  • The referential in which the redshift is to be calculated. If solar or galactocentric, the transformation from the Earth value has to be treated either in 2D or 1D

 Comments   
Comment by rhl [ 15/Mar/22 ]

2-D will not be correcting for Milky Way absorption, we will attempt to estimate the spectrum at the top of the atmosphere. 2-D only handles things that it knows better than 1-D (e.g. fibre extractions, PSFs, sky, standard stars), and the ISM absorption for a given object is not one of them.

Comment by price [ 16/Mar/22 ]

Making RHL's statement more explicit with regards to the second question: I understand that 2D has responsibility for the barycentric correction, but that is not yet implemented.

Comment by vlebrun [ 16/Mar/22 ]

That was indeed quite implicit, then we'll take care of ISM and will leave you with velocities.

Comment by rhl [ 16/Mar/22 ]

Not just implicit, I read your words about "solar or galactocentric" and stopped paying attention.

Paul is correct: 2-D should reduce wavelengths to barycentric. It's up to 1-D to choose a coordinate system and calculate velocities.

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