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musevlt / mpdaf

MUSE Python Data Analysis Framework
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Variance array units. #19

Closed Vital-Fernandez closed 3 years ago

Vital-Fernandez commented 3 years ago

My appologies if I missed this information on the documentation. I am working with a MUSE data cube which includes the variance layer from reduction pipeline.

A spectrum object from this cube has the units specified as '1e-20 erg / (Angstrom cm2 s)'. This is the expected value.

However, I wonder if the variance array provided by the spectrum_object.var has also also these units or what we actually have is the squared of the flux units.

Thank you very much for your work.

RolandBacon commented 3 years ago

The array unit are of variance type, i.e. the squared of the flux unit (1.e-20 erg.s-1.cm-2.A-1)**2

Roland Bacon CRAL - Observatoire de Lyon 9, avenue Charles André 69230 Saint-Genis-Laval tel: +33 478 86 85 59 mobile: +33 608 09 14 27

On 27 Apr 2021, at 23:22, Vital Fernández @.***> wrote:

My appologies if I missed this information on the documentation. I am working with a MUSE data cube which includes the variance layer from reduction pipeline.

A spectrum object from this cube has the units specified as '1e-20 erg / (Angstrom cm2 s)'. This is the expected value.

However, I wonder if the variance array provided by the spectrum_object.var has also also these units or what we actually have is the squared of the flux units.

Thank you very much for your work.

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Vital-Fernandez commented 3 years ago

Thank you very much.