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[gnuastro-commits] master 337e46d 18/32: The half-light radii

From: Mohammad Akhlaghi
Subject: [gnuastro-commits] master 337e46d 18/32: The half-light radii
Date: Wed, 24 Feb 2021 22:36:18 -0500 (EST)

branch: master
commit 337e46d2cca6c26a55e7e6db1f097a5c8525030f
Author: Zahra Sharbaf <>
Commit: Zahra Sharbaf <>

    The half-light radii
    With this commit, the half-light radius has been calculated. Half-light
    radius Re encloses half of the total light emitted by an object.
 bin/script/ | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/bin/script/ b/bin/script/
index 4d49c2f..1ab9210 100644
--- a/bin/script/
+++ b/bin/script/
@@ -448,6 +448,14 @@ asttable $bprofile \
 cat $aprofile | asttable -o$output
+# Calculate the Half-Light Radii
+# The half-light or 'effective' radius as the radius within which half of
+# the object's luminosity is contained.
+halfoflight=$(asttable $output | awk '{if(max<$2){max=$2}}END{print max/2}')
+radius=$(asttable $output \
+           | awk '{if('$(echo $halfoflight)'<=$2){line=$1;light=$2}}END{print 
+echo "Half-Light-Radii: $radius pixels from the center of the object"
 # Remove temporal files

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