Add ability to make NIRSpec MSA observations

[stephenmwilkins]

NIRSpec MOS uses a micro-shutter array (MSA). The open area of each MSA shutter is 0.20" × 0.46" (width in the dispersion direction × spatial direction).

We should be able to make synthetic MSA observations assuming the galaxy is in the centre of the shutter. This should also yield a comparison with the total spectrum.

I think this an additional class beyond SpectralCube, Image, and Sed but the result would look something like an integrated Sed.

[WillJRoper]

Probably need an in-depth discussion about this. Seems to me like a simple addition to the spectral cube class.

Like a “apply_shutter” method or similar.

[stephenmwilkins]

Possibly... it requires spatial information but the result is a 1D spectra (like Sed).

[WillJRoper]

It's derived from the IFU though, right? It's an integration inside a shutter ("aperture")

[stephenmwilkins]

It could be, but it seems overkill to generate the SpectralCube first. In reality you just need a condition on the particles based on their coordinates.

s = (np.fabs(x_arcsec)<0.1) & (np.fabs(y_arcsec)<0.23)

assuming x and y are measured from the centre.

Now, obviously this is sensitive to the position angle but in reality you don't have much control over that.

[stephenmwilkins]

Although... now I think about it you need to worry about the PSF as well. So maybe you should make the IFU at super-resolution and cut out the rectangle.