le (BBH) merger density distribution between BBH from Population I/II (Pop I/II) stars, BBH from Pop III stars, and primordial black holes (PBHs):</p>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>BBH type</p></th>
<th class="head"><p>Merger rate density distribution</p></th>
<th class="head"><p>Peak value</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>Pop I/II stars</p></td>
<td><p>Peaks at redshift <span class="math notranslate nohighlight">\(z \sim 1-