Underestimation of fluxes in blue arm #130
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Hi @nataschasattler, I think we fixed this issue in the current version of the pipeline in master branch. Could you please reduce your exposures again with that version of the pipeline? You may also need to pull from lvmcore repository to be able to run the latest version of the DRP. |
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with the DRP version of 3rd of September, it seems to be a bit better I guess but the difference is not striking |
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I now think this is related to a problem with the GAIA XP spectra at < 4000 Angstrom. See, for example, https://arxiv.org/abs/2404.14626 Fig. 1 |
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In M20, we see an underestimation of the fluxes, especially in the blue arm (using DRP version 1.0.4.dev0 and the resulting SFrames). We compared the LVM fluxes with measured long-slit fluxes by Garcia-Rojas 2006 (GR, https://ui.adsabs.harvard.edu/abs/2006MNRAS.368..253G). Therefore we used the fluxes in the fiber that corresponds best to the region of the GR long-slit.
In the attached plot we compare each flux normalized to Hb from LVM (y-axis) and the GR paper (x-axis).
We used for M20 the following early science frames:
MJD 60214 (Frames 5584, 5585, 5588, 5589)
MJD 60216 (Frames 5735, 5736)
MJD 60217 (Frames 5833, 5834)
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