This is the Vindicator Cruiser. Manufactured by Sienar Fleet Systems, the 600m Vindicator was the basis of the Immobilizer 418 Cruiser and the later Enforcer Picket Cruiser.
About this creation
It was designed for use when an Imperial or Victory Star Destroyer were unavailable and a Strike Cruiser or Nebulon B Frigate would not be enough.
It is armed with 20 light quad turbolasers, 25 light turbolasers, 10 point defense laser cannons, 20 light point defense ion cannons, and 3 tractor beam projectors. This pic shows the Vindicator with larger Star Destroyers.
Vindicator Cruisers housed 2 to 6 squadrons of TIE Fighters, with most holding 6.