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I looked for an answer to this question but I can't figure it out. I am wondering what are the units of the physical coordinated when displaying an image in ds9. The only thing I found about this is:physical
Physical coordinates are pixel coordinates invariant with respect to linear transformations of the physical image data. For example, if the current image was created by extracting a section of another image, the physical coordinates of an object in the current image will be equal to the physical coordinates of the same object in the parent image, although the logical coordinates will be different. But what are the units? Do they have similar units as the RA and Dec or are they in degrees, or some other units?Thanks!

I got it! It is in degrees