Changes between Version 5 and Version 6 of PS-photometry-test01

Timestamp:

Nov 23, 2016, 3:47:31 PM (10 years ago)

Author:

ehsan

Comment:

--

PS-photometry-test01

@@ -13 +13 @@
 
 [[Image(http://www.ifa.hawaii.edu/~ehsan/test/PS_pgc5284_panstarrs_images.jpg, 700px)]] 
- - This is the case that Pan_STARRS and SDSS are completely consistent. Even though the center of the galaxy is saturated in the PS image, it still gives a reasonable result. (Left/Top: without sky subtraction - Right/Bottom: with sky subtarction)
+ - This is the case that Pan_STARRS and SDSS are completely consistent. Even though the center of the galaxy is saturated in the PS image, it still gives a reasonable result. 
+ - On the left plot, it is clear that around 1.5 arcmin, the average surface brightness becomes negative, that's why there is no point on the plot, and on the right side, the same plot, the residual sky subtracted brightness might be meaningless. That's the reason sky brightness errors are huge/unreasonableness. 
+ - (Left/Top: without sky subtraction - Right/Bottom: with sky subtarction)
 [[Image(pgc5284.jpg, 700px)]]  [[Image(pgc5284_skySubtracted.jpg, 700px)]]
 ---- 
@@ -19 +21 @@
 
 [[Image(http://www.ifa.hawaii.edu/~ehsan/test/PS_pgc40516_panstarrs_images.jpg, 700px)]] 
- - This case appears fainter in all PS images. (Left/Top: without sky subtraction - Right/Bottom: with sky subtarction)
+ - This case appears fainter in all PS images. 
+ - On the left plot, it is clear that around 2 arcmin, the average surface brightness becomes negative, that's why there is no point on the plot.
+ - (Left/Top: without sky subtraction - Right/Bottom: with sky subtarction)
 [[Image(pgc40516.jpg, 700px)]]  [[Image(pgc40516_skySubtracted.jpg, 700px)]]
 
@@ -25 +29 @@
 
 [[Image(http://www.ifa.hawaii.edu/~ehsan/test/PS_pgc93031_panstarrs_images.jpg, 700px)]] 
- - This case appears brighter in g-band PS image. (Left/Top: without sky subtraction - Right/Bottom: with sky subtarction)
+ - This case appears brighter in g-band PS image. 
+ - In this case not subtracting the sky does not help. Push the point towards brighter magnitudes.
+ - (Left/Top: without sky subtraction - Right/Bottom: with sky subtarction)
 [[Image(pgc93031.jpg, 700px)]] [[Image(pgc93031_skySubtracted.jpg, 700px)]]
 ----