ACR X TCASII TA RA WITH LTT IN ATA AFTER TKOF AT 700 FT.

Narrative

WE ENCOUNTERED ABOUT A 35-40 MIN TAXI DELAY DUE TO DEN DEP CTL RADAR BEING OTS AND DEP SEPARATION WAS PER DEN CTR RADAR REQUIREMENTS. WE WERE CLRED FOR TKOF SHORTLY AFTER THE ACFT IN FRONT OF US WAS AIRBORNE. IF DEP CTL RADAR WAS UP AND RUNNING; WE WERE NEVER TOLD ABOUT IT. DUE TO TAIL WIND; TKOF WAS MADE WITH FLAPS 15; MAX EPR. AT ABOUT 500 FT AFE; WE RECEIVED A 'TA' AND ABOUT 700 FT AFE WE RECEIVED A 'RA' TO CLB. THE SCOPE SHOWED AN ACFT AT OUR 10 O'CLOCK POS ABOUT 1 MI DISTANCE. WE COULD ALSO SEE LNDG LIGHTS POINTED IN OUR DIRECTION AND AT OUR ALT. CAPT WAS FLYING AND ACFT WAS PERFORMING AT V2 PLUS 10. I COULD NOT CLB ANY FASTER WITHOUT POSSIBLY GETTING A STICK SHAKER AND I DARED NOT DSND AT THAT ALT AT NIGHT. I POSSIBLY COULD HAVE TURNED EBOUND BUT I WAS NOT SURE IF AN ACFT WAS AIRBORNE OFF RWY 35R. THE TCASII CONTINUED TO GET UPSET BECAUSE I WAS NOT CLBING PER REQUIREMENTS NEEDED TO MISS THE ACFT. THIS LASTED FOR ABOUT 15-20 SECONDS AND VISUALLY WE COULD SEE THE ACFT WAS TURNING S AND WOULD MISS US. WE HAD BEEN SWITCHED TO DEP CTLR FREQ ABOUT THE SAME TIME AS THE TA AND RA WERE ENCOUNTERED. I QUIZZED THE CTLR ABOUT THE ACFT AND WAS TOLD THAT HE KNEW NOTHING ABOUT IT. I QUIZZED HIM AGAIN AND THEN WAS TOLD THAT AN LTT HAD LANDED ON RWY 18 AND WAS NOT PROBLEM TO OUR ACFT. I HAD NOT BEEN TOLD ABOUT THIS VFR TFC LNDG IN THE OPPOSITE DIRECTION. WITH ALL THE CITY LIGHTS OUT THE L SIDE OF THE ACFT IT WAS DIFFICULT TO SPOT THE ACFT.