6684( 4) - 10/20/97 08:59 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6684 Version: 4 Check-in Date: 20-Oct-1997 08:58:39 1.Proposal Title: WFPC2 Imaging of 2 Jy radio galaxies ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 6 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: MALCOLM LONGAIR CAVENDISH LAB CoI: Philip Best Cavendish Laboratory, Cambridge University Y CoI: Steve Eales Cardiff University N CoI: Steve Rawlings Oxford University N CoI: Huub Roettgering Leiden Observatory N ------------------------------------------------------------------------------------ 5. Abstract Constraining the evolution models of elliptical galaxies back to their formation epoch relies upon observation of galaxy samples at cosmological redshifts. To date, the best sample available has been that of the powerful 3CR radio galaxies. Our recent HST images of the host galaxies of these sources reveal their optical morphologies to be strongly influenced by their radio activity and, in particular, there is clear evidence that the optical structures evolve as radio source size increases. This complicates their use as probes of galaxy evolution. To study unbiased stellar populations at high redshift, it is essential to observe distant galaxies which are not affected by extreme radio activity. For the first time, this is now possible using a complete sample of 6C galaxies, which are almost an order of magnitude lower in radio luminosity than the 3CR sources. The proposed observations of these galaxies will show the degree to which they display the same structures as those at higher radio luminosity; this will quantify the importance of the radio beam power, and is a crucial discriminant between models of the aligned structures of distant radio galaxies. If the 6C galaxies are not strongly influenced by the weaker radio jets then they will provide the first sample of `ordinary' giant elliptical galaxies at high redshifts, and can be used to constrain the evolution models at early epochs. Determining the ages of their stellar populations will place limits on the age of the Universe, and on the choice of cosmological model. ------------------------------------------------------------------------------------ 6684( 4) - 10/20/97 08:59 - [ 2] Observations Description ------------------------ The five 6C radio galaxies 0943+39, 1011+36, 1017+37, 1129+37 and 1256+36 from the sample of 6C galaxies defined by Eales in 1985, form a complete subsample of these galaxies within the redshift range 1.0 < z < 1.15. This is the redshift range in which the 3CR sources (already observed in cycles 4 and 5 and to which these galaxies form a lower radio luminosity comparison sample) are most spectacularly aligned along the radio axis. It is proposed to image these five 6C galaxies using the WFPC2, for two orbits each through the filter F702W. This will provide a good comparison to the 3CR data. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: Professor M.S.Longair,, Cavendish Laboratory,, Madingley Road,, Cambridge,, CB3 0HE., ENGLAND Ship Via: Email: ------------------------------------------------------------------------------------ 6684( 4) - 10/20/97 08:59 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 6C0943+39 GALAXY, RADIO GALAXY, RA=09H 46M 18.70S +/- 2000 Z = V = 23 HIGH Z GAL 0.1S,DEC=39D 44' 18.3" +/- 1.0" 1.039 B-V = 1 Comments: Faint Galaxy Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000 0.0 0.0 0.0 2 6C1011+36 GALAXY,RADIO RA=10H 14M 12.86S +/- 2000 Z = V = 23 GALAXY,HIGH REDSHIFT 0.1S,DEC=36D 17' 17.9" +/- 1.0" 1.040 B-V = 1 GALAXY Comments: Faint Galaxy 3 6C1017+37 GALAXY,RADIO RA=10H 20M 39.94S +/- 2000 Z = V = 22.5 GALAXY,HIGH REDSHIFT 0.1S,DEC=36D 57' 1.3" +/- 1.0" 1.050 B-V = 1 GALAXY Comments: Faint Galaxy 4 6C1129+37 GALAXY, RADIO GALAXY, RA=11H 32M 35.35S +/- 2000 Z = V = 23.5 HIGH Z GAL 0.1S,DEC=36D 54' 17.8" +/- 1.0" 1.060 B-V = 1 Comments: Faint Galaxy Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000 0.0 0.0 0.0 5 6C1256+36 GALAXY,RADIO RA=12H 59M 6.07S +/- 2000 Z = V = 23.5 GALAXY,HIGH REDSHIFT 0.1S,DEC=36D 31' 58.2" +/- 1.0" 1.127 B-V = 1 GALAXY Comments: Faint Galaxy 6684( 4) - 10/20/97 08:59 - [ 4] Visit: 01 Visit Priority: Visit Requirements: 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 6C0943+39 WFPC2 IMAGE WFALL F702W 2 2400 S LOW-SKY END ORBIT Comments: Each exposure has been set nominally to 2400 seconds. The intention is that each exposure should take one half-orbit and so a slightly longer integration time may be possible. ------------------------------------------------------------------------------------------------------------------------------------ 6684( 4) - 10/20/97 08:59 - [ 5] Visit: 02 Visit Priority: Visit Requirements: 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 ------------------------------------------------------------------------------------------------------------------------------------ 2 6C1011+36 WFPC2 IMAGE WFALL F702W 2 2400 S LOW-SKY END ORBIT ------------------------------------------------------------------------------------------------------------------------------------ 6684( 4) - 10/20/97 08:59 - [ 6] Visit: 03 Visit Priority: Visit Requirements: 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 ------------------------------------------------------------------------------------------------------------------------------------ 3 6C1017+37 WFPC2 IMAGE WFALL F702W 2 2400 S LOW-SKY END ORBIT ------------------------------------------------------------------------------------------------------------------------------------ 6684( 4) - 10/20/97 08:59 - [ 7] Visit: 04 Visit Priority: Visit Requirements: 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 ------------------------------------------------------------------------------------------------------------------------------------ 4 6C1129+37 WFPC2 IMAGE WFALL F702W 2 2400 S LOW-SKY END ORBIT ------------------------------------------------------------------------------------------------------------------------------------ 6684( 4) - 10/20/97 08:59 - [ 8] Visit: 05 Visit Priority: Visit Requirements: 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 ------------------------------------------------------------------------------------------------------------------------------------ 5 6C1256+36 WFPC2 IMAGE WFALL F702W 2 2400 S LOW-SKY END ORBIT ------------------------------------------------------------------------------------------------------------------------------------ 6684( 4) - 10/20/97 08:59 - [ 9] Summary Form for Proposal 6684 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements LOW-SKY END ORBIT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F702W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 6C0943+39 6C1011+36 6C1017+37 6C1129+37 6C1256+36 ------------------------------------------------------------------------------------------------------------------------------------