M87 - big image

Same procedure as before, except using larger image of M87, without the bottom left corner cropped.




Before:                                                                                                                           After: [this one is used now!]
    

In this, we call the new big image B.fits, for ease of repeated typing.


First, we prepare the total mask (BTM.pl) as before. It is composed of:
    final star mask
    hand mask
    obj mask
    UN mask to keep the center in the image


Smoothing and subtracting we get: [Br38s.fits]



OBJmask this: [Br38sP1.pl on B.fits]




Now, for completeness, here is the hand mask and the final star mask, together:



And here is the initial total mask (with the UNmask on the center, too): [BTM.pl]



This is what gets fed into ellipse ! Here are the results:
     
tdump B.dat cdfile = B.c.dat pfile = B.h.dat datafil = B.d.dat
[B.dat]


Compare this to previous results:    BLUE - New    GREEN - Old
[old is with small/incomplete M87 image, new is with full image]
     
                                                                                   ^^   oops, ignore this graph   ^^


When we generate that fit, and subtract it from the original image: [B.fits - Bm2.fits = Bm2s.fits]


and binning it 7x7: [Bms77.fits]



Taking closer looks at this, we overlay some ellipses on it. We are looking at the outermost limit for each fitting method.
These super big SMA ellipses were not good fits. The red/magenta ellipses are from the last 'good' fit generated by ellipse
   BLUE - New Limit    GREEN - Old Limit       log(r) = 3.5, 3, 2.5, 2
Good fits:   Red - Old Limit   Magenta - New Limit

...zoom in some...
   BLUE - New Limit    GREEN - Old Limit       log(r) = 3.5, 3, 2.5, 2
Good fits:   Red - Old Limit   Magenta - New Limit

...zoom in more.
   BLUE - New Limit    GREEN - Old Limit       log(r) = 3.5, 3, 2.5, 2
Good fits:   Red - Old Limit   Magenta - New Limit


Zooming in more, and adding an ellipse around the radius that the PA has that weird feature:


...keep zooming in




Or, looking at this central area on the masked (but unsubtracted) image:
e