sucking in particles

So, you could let your wind zone apply the forces and then, inside of the loop here, check to see if it is inside the black hole. If so, kill the particle (some how) or zero its velocity. Somethin' like that. OR, you could skip the wind zone and have more control over the motion of the particles with the script here. Either way I think will work. Here is the documentation of Unity's particle so you can see what you can modify on them: ParticleSystem.Particle

A local variable named vecToTarget' cannot be declared in this scope because it would give a different meaning to vecToTarget', which is already used in a `parent or current' scope to denote something else

I'm getting this error

The example code in your answer goes in the right direction, however you have inconsistent naming of your variables. Specifically "modifiedParticles" and "particles" which look like they should be the same.

btw: To erase a particle, just remove it from the array. To do this you would just replace the particle you want to get rid of with the last particle (length-1) and then reduce "length" by 1. So when setting the particles back you only set the particles you want to keep:

 // length = 10
 // index:     0   1   2   3   4   5   6   7   8   9  10  11
 // particle:  P0  P1  P2  P3  P4  P5  P6  P7  P8  P9  X   X ....

To remove particle 2 you would just move P9(the last one) to index 2 and decrease length by 1

 // length = 9
 // index:     0   1   2   3   4   5   6   7   8   9  10  11
 // particle:  P0  P1  P9  P3  P4  P5  P6  P7  P8  X   X   X ....

if you also want to remove particle 5 do the same again:

 // length = 8
 // index:     0   1   2   3   4   5   6   7   8   9  10  11
 // particle:  P0  P1  P9  P3  P4  P8  P6  P7  X   X   X   X ....

It doesn't matter where in the array a certain particle is located. Note the "X" just indicates an "unused" array element. So a generic "remove" method would be something like this:

 public static void RemoveParticle(ParticleSystem.Particle[] aParticles, ref int aLength, int aIndex)
 {
     if (aLength <= 0 || aIndex < 0 || aIndex >=aLength)
         return;
     aLength--;
     if (aIndex < aLength)
         aParticles[aIndex] = aParticles[aLength];
 }