hst, general relativity and einstein ring
Post on 03-Mar-2016
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How to talk about relativity ?With a smile !
galaxies SDSSCGB 8842.3 and SDSSCGB 8842.4, strong gravitational lensing and Einstein ring. Reprocessed data from the Hubble Space Telescope
Mehdi Bozzo-Rey, mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
idea 1Gravity can be seen as a property of the space time geometry instead of a force
Mehdi Bozzo-Rey: mehdi@exploresciences.com
2 particles, no acceleration / force, parallel / straight trajectories.
2 particles + force (like gravitation) : massive structure at convergence point. Curved instead of straight trajectory
2 particles start in parallel but converge even if they are following the straightest path because the space is curved
http://www.einstein-online.info/elementary/generalRT/GeomGravity
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
idea 2If a structure is massive and compact enough it can curve the space time so the light emitted from a source can reach the observer using 2 different paths
Mehdi Bozzo-Rey: mehdi@exploresciences.com
http://www.einstein-online.info/spotlights/light_deflection
If the source, the lens and the observer are all aligned then what is called an Einstein ring can be observed.
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
where to get the data
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
loading the original fits data
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
something is not right ...
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
comparing with the fits preview from the HLA
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
How to fix it ?download the single exposures files: no luck
download the datasets from MAST: no luck
download individual files from MAST: no luck ...
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
Fits liberator will save us
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
opening the file with fits liberator
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
using fits liberator to export fits files as tiff files
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
And fits liberator saved the day !
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
loading all the datasets
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
IR data are not really usable
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
Who used the IR detector for shotgun target practice ?Nobody, but we have a death star and blobs !
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
WFC3 IR channel - death star
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
WFC3 IR channel - blobs
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
processing strategy use the WFPC2 images only Align the WFPC2 images combine the 3 images as RGB image:
Red: F814W Green: F606W Blue: F450W
standard processing
Option 2: use the WFC3 sub with F360W filter as luminance to create a LRGB picture
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
First step: crop
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
crop(2)
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
crop(3)
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
STF autostretch on the cropped images
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
dynamic alignment - Image registration section
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
dynamic alignment: F450W as reference
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
dynamic alignment: select the second image
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
dynamic alignment: control points - auto search
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
dynamic alignment - execution
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
dynamic alignment - registered image
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
last image to register / align
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
ready for channel combination !
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
channel combination
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
channel combination
Mehdi Bozzo-Rey: mehdi@exploresciences.com
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
channel combination - RGB image
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
image flip
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
STF - autostretch
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
Dynamic Background Extraction
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
Dynamic crop
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
background neutralization
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
color calibration
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
sample format conversion
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
STF process reinjected in Histogram Transformation
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
channel extraction- masks creation
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
channel extraction - masks creation
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
working the masks with histogram transformation
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
finalizing masks creation
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
Wavelet transformHDR multiscale transform does not improve a lot the overall image, we will use wavelet transform instead (with luminance mask)
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
histogram transformation - background
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
curves transformation - background
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
starting point
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
final imageoriginal image :https://www.spacetelescope.org/images/potw1506a/
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
bonus 1: one ring to rule them all !http://www.spacetelescope.org/images/potw1151a/
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
how to get the dataDo the search with RA and DEC
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Mehdi Bozzo-Rey: mehdi@exploresciences.com
LRG-3-757
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