8315( 12) - 11/06/00 13:04 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 8315 Version: 12 Check-in Date: 06-Nov-2000 13:04:00 1.Proposal Title: The Location of the Active Nucleus in the Radio Galaxy 3C 294 ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 8 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Alan Stockton University of Hawaii CoI: Dr Susan Ridgway The Johns Hopkins University N ------------------------------------------------------------------------------------ 5. Abstract We have obtained AO K'-band imaging of the z=1.779 radio galaxy 3C 294 showing detailed and intriguing structure within a region a little larger than an arcsecond across. Our bandpass corresponds to restframe 6800--8300 Angstrom, a region devoid of strong emission lines, so it is likely that the structure is dominated by continuum radiation. It is not obvious which (if any) of the numerous knots corresponds to the nucleus, and the correct interpretation of the structure depends critically on its location. The center of 3C 294 lies about 9" from a V=12 star, and we know the registration of our image with respect to this star to an accuracy of ~10 mas. Furthermore, the position of the compact flat-spectrum radio core is known from VLA observations to a similar or better precision. However, the position of the bright star is uncertain by at least 0.8" (2 Sigma). We need to improve this uncertainty by at least a factor of 6 in order to locate the nucleus with sufficient precision in our image. We propose to use FGS1R to measure the position of the star and three nearby V~15 stars with respect to a bright Hipparcos star, which can be placed simultaneously in the FGS1R pickle. We will use groundbased observations to determine more accurately the HST rotation angle so that we can obtain both coordinates to the required accuracy from the single astrometric standard. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will make two POS measurements of HIP68851 (=BD+35D2523) and one POS measurement of each of the 15th mag stars near 3C294. We will also make a TRANS measurement of the (double) AO guide star. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 8315( 12) - 11/06/00 13:04 - [ 2] Data Distribution Paper Products: NO Media: ELECTRONIC Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 8315( 12) - 11/06/00 13:04 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 STAR- CALIBRATION, RA=14H 6M 43.35S +/- 0.1S, J2000 V=0 V = 12.02+/-0.1 140643+34112 ASTROMETRIC, STAR, K DEC=34D 11' 23.2" +/- 1", PLATE- B-V = 0.86+/-0.1 3 III-I ID=01PW 2 STAR- STAR, K III-I, RA=14H 6M 43.35S +/- 0.1S, J2000 V=0 V = 15.02+/-0.1 140643+34112 CALIBRATION, DEC=34D 11' 23.2" +/- 1", PLATE- B-V = 0.86+/-0.1 3-P ASTROMETRIC ID=01PW Coordinate Source: GUIDE_STAR_CATALOG Comments: This is same object as 140643+341123 except that this faint magnitude is specified to assure a successful POS-mode acquisition of this binary system. 3 BD+35D2523 CALIBRATION, RA=14H 5M 56.03S +/- 0.1S, J2000 V=0 V = 8.38+/-0.05 ASTROMETRIC, STAR DEC=34D 22' 57.7" +/- 1" B-V = 1.1+/-0.1 Coordinate Source: GUIDE_STAR_CATALOG 4 STAR-REF1 CALIBRATION, RA=14H 6M 34.80S +/- 0.1S, J2000 V=0 V = 16.2+/-0.5 ASTROMETRIC, STAR DEC=34D 12' 47.2" +/- 1" Coordinate Source: OTHER_SOURCE 5 STAR-REF2 CALIBRATION, RA=14H 6M 43.85S +/- 0.1S, J2000 V=0 V = 15.5+/-0.5 ASTROMETRIC, STAR DEC=34D 14' 16.3" +/- 1" Coordinate Source: OTHER_SOURCE 6 STAR-REF3 CALIBRATION, RA=14H 6M 48.18S +/- 0.1S, J2000 V=0 V = 14.7+/-0.5 ASTROMETRIC, STAR DEC=34D 13' 1.0" +/- 1" Coordinate Source: OTHER_SOURCE 8315( 12) - 11/06/00 13:04 - [ 4] Visit: 01 Visit Priority: Visit Requirements: ORIENT 314.9D TO 314.9D SCHED 50% On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 STAR-140643 FGS TRANS 1 F583W SCANS=12,STEP-SIZE=1.0 1 380 S SAME POS AS 40 SEQ 10-130 +341123 NON-INT GS ACQ SCENARIO SINGLE ------------------------------------------------------------------------------------------------------------------------------------ 20 STAR-140643 FGS POS 1 F583W FES-TIME=0.1 1 10 S SAME POS AS 40 +341123-P ------------------------------------------------------------------------------------------------------------------------------------ 30 STAR-REF3 FGS POS 1 F583W 1 20 S SAME POS AS 40 ------------------------------------------------------------------------------------------------------------------------------------ 40 BD+35D2523 FGS POS 1 F583W 1 20 S POS TARG -459.0,-118.9 ------------------------------------------------------------------------------------------------------------------------------------ 50 STAR-140643 FGS POS 1 F583W FES-TIME=0.1 1 10 S SAME POS AS 40 +341123-P ------------------------------------------------------------------------------------------------------------------------------------ 60 STAR-REF3 FGS POS 1 F583W 1 20 S SAME POS AS 40 ------------------------------------------------------------------------------------------------------------------------------------ 70 STAR-REF2 FGS POS 1 F583W 1 20 S SAME POS AS 40 ------------------------------------------------------------------------------------------------------------------------------------ 80 STAR-REF1 FGS POS 1 F583W 1 20 S SAME POS AS 40 ------------------------------------------------------------------------------------------------------------------------------------ 90 STAR-140643 FGS POS 1 F583W FES-TIME=0.1 1 10 S SAME POS AS 40 +341123-P ------------------------------------------------------------------------------------------------------------------------------------ 100 STAR-REF3 FGS POS 1 F583W 1 20 S SAME POS AS 40 ------------------------------------------------------------------------------------------------------------------------------------ 110 BD+35D2523 FGS POS 1 F583W 1 20 S SAME POS AS 40 ------------------------------------------------------------------------------------------------------------------------------------ 120 STAR-140643 FGS POS 1 F583W FES-TIME=0.1 1 10 S SAME POS AS 40 +341123-P ------------------------------------------------------------------------------------------------------------------------------------ 130 STAR-REF2 FGS POS 1 F583W 1 20 S SAME POS AS 40 ------------------------------------------------------------------------------------------------------------------------------------ 8315( 12) - 11/06/00 13:04 - [ 5] Summary Form for Proposal 8315 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations FGS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes TRANS POS ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SCANS=12 STEP-SIZE=1.0 FES-TIME=0.1 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 314.9D TO 314.9D SCHED 50% SAME POS AS 40 SEQ 10-130 NON-INT GS ACQ SCENARIO SINGLE SAME POS AS 40 POS TARG -459.0,-118.9 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F583W ------------------------------------------------------------------------------------------------------------------------------------ Target Names STAR-140643+341123 STAR-140643+341123-P STAR-REF3 BD+35D2523 STAR-REF2 STAR-REF1 ------------------------------------------------------------------------------------------------------------------------------------