- #1
BOAS
- 552
- 19
Hello,
I am reading a review on weak gravitational lensing (https://arxiv.org/pdf/astro-ph/0509252.pdf) and they define the center of an image as follows:
$$\vec \theta_c = \frac{\int d^2 \theta I(\vec \theta) q_I [I(\vec \theta)] \vec \theta}{\int d^2 \theta I(\theta) q_I[I(\vec \theta)]}$$
where ##I(\vec \theta)## is the brightness distribution of an image isolated in the sky and ##q_I(I)## is some weight function.
I am having some trouble seeing that this does indeed define the center of an image and was hoping someone could help me see it.
I am reading a review on weak gravitational lensing (https://arxiv.org/pdf/astro-ph/0509252.pdf) and they define the center of an image as follows:
$$\vec \theta_c = \frac{\int d^2 \theta I(\vec \theta) q_I [I(\vec \theta)] \vec \theta}{\int d^2 \theta I(\theta) q_I[I(\vec \theta)]}$$
where ##I(\vec \theta)## is the brightness distribution of an image isolated in the sky and ##q_I(I)## is some weight function.
I am having some trouble seeing that this does indeed define the center of an image and was hoping someone could help me see it.