5930( 0) - 07/18/95 18:43 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5930 Version: ********** Check-in Date: ********** 1.Proposal Title: WFPC2 Imaging of Intermediate Redshift Radio Galaxies ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle AGN GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Patrick McCarthy Observatories of the Carnegie Institution CoI: Dr. Stefi Baum Space Telescope Science Institute N CoI: Dr. William Sparks Space Telescope Science Institute N CoI: Dr. George Miley Sterrewatch, Leiden University N CoI: Dr. Daniel Golombek Space Telescope Science Institute N CoI: Dr. John Birretta Space Telescope Science Institute N CoI: Dr. Duccio Macchetto Space Telescope Science Institute N ------------------------------------------------------------------------------------ 6. Abstract We propose to image three radio galaxies with redshifts between 0.2 and 0.5. All of these showed significant structure on sub-arc second scales in our SNAPSHOT images from cycle 4. These galaxies appear to be intermediate redshift analogues to the high redshift radio galaxies and exhibit the alignment effect. This short program will provide insights into the physical processes that are produce the extended continuum and emission-line regions in powerful radio sources. ------------------------------------------------------------------------------------ 5930( 0) - 07/18/95 18:43 - [ 2] Observations Description ------------------------ We intend to observe each object in OIII for a single orbit and to use a second orbit for each target to observe through two continuum filters. We have chose the two continuum filters to provide line-free continuum ( or as much so as possible) in the optical near OIII and in the rest frame ultraviolet and we intend to scale our integrations times by the throughput of the telescope/filter assembly to provide roughly equal sensitivity in the optical and uv (rest frame) images. All observations will be cr-split. In a single orbit, we will thus obtain optical integrations of roughly 8 minutes total duration and uv integrations of roughly 24 minutes total duration. Our existing WFPC2 snapshot continuum images (see Figure 1.), which are of duration roughly 3 minutes total show interesting features, but also pass light from emission lines at the redshifts of our objects. With the new continuum images we request here, we will obtain line- free continuum images in two colours with a signal to noise better than that of our snapshot observations. The rest frame optical observations will allow us to subtract the continuum from our line images, the rest frame uv images will allow us to study the alignment effect in these low redshift sources at the same rest wavelengths at which the alignment affect is seen in the high redshift radio galaxies, and the two colours will allow us to pinpoint blue regions (e.g., synchrotron jets and hotspots, scattering cones, star formation). We have ground-based OIII5007 images of all three galaxies and so have a reliable measure of the total fluxes and surface brightnesses at 1^'' resolution (McCarthy et al. 1994, in press). We estimate that in 1 orbit, we can obtain a signal to noise of roughly 3-5 for the line emission, under the conservative assumption that the line emission seen in the ground based images is evenly spread over the 1'' ground based beam (see sample calculation below). These observations will be crucial for studying gas/jet interactions, for distinguishing continuum and gas features and for studying their relationship to one another (e.g., both shocked gas and uv synchrotron might be expected to arise in similar sites). Sample Line Calculation > From ground based images in OIII5007, we know that the line flux of 3C460 is 3* 10^-15 erg/sec/cm^2 and that that emission is spread over a region roughly 1'' x 4'' in size. For the WF we therefore expect a flux of roughly 7.5 * 10^-18 per pixel (making the conservative estimate that the flux is evenly spread over that region). Using the information provided in the WFPC2 handbook, we find that in a typical single orbit integration time of 2400 seconds, we will achieve a signal to noise of roughly 3 per pixel, allowing for quantization and shot noise. However, the typical signal to noise should be quite a bit higher, as we expect the line emitting regions to show significant structure on the scale of the HST beam. NOTE: On advice of WFPC2 IS John Biretta ( one of our co-Is ) we have changed Exp Log line 3 in Visits 1 and 2 to LRF. Likewise, on the same basis, we have changed Exp Log line 3 in visit 3 to LRF in combination with an absolute ORIENT range. A value 180 degrees off this ORIENT range is acceptable also if necessary for scheduling purposes. Real Time Justification ----------------------- At present we extensive supporting observations in hand. These consist of the SNAPSHOT images shown above, as well as ground-base photometry, long-slit spectra, narrow-band images and VLA observations. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 5930( 0) - 07/18/95 18:43 - [ 3] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5930( 0) - 07/18/95 18:43 - [ 4] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 3C460.0 GALAXY; RADIO GALAXY; RA=23H 18M 59.75S +/- 0.1S, B1950 Z=0.268 V=18.8 DEC=+23D 30M 20.4S +/- 1" Comments: B-V=0.5 +/- 0.2 2 3C330.0 GALAXY; RADIO GALAXY; RA=16H 09M 13.90S +/- 0.1S, B1950 Z=0.550 V=20.33 HIGH Z GAL; DEC=+66D 04M 22.8S +/- 1" Comments: B-V=0.5 +/- 0.2 3 3C79.0 GALAXY; RADIO GALAXY; RA=03H 07M 11.48S +/- 0.1S, B1950 Z=0.2559 V=18.5 DEC=+16D 54M 36.9S +/- 1" Comments: B-V=0.5 +/- 0.2 5930( 0) - 07/18/95 18:43 - [ 5] Visit: 01 Visit Requirements: PCS MODE Fine 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 3C460.0 WFPC2 IMAGE PC1 F547M CR-SPLIT=0.5 CR 1 600S POS TARG 0.0, 0.0 MAX DUR 2000S MIN DUR -TOLERANCE=0.0 300S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 3C460.0 WFPC2 IMAGE PC1 F300W CR-SPLIT=0.5 CR 1 1200S POS TARG 0.0, 0.0 MAX DUR 2000S MIN DUR -TOLERANCE=0.0 600S EXPAND END ORBIT ------------------------------------------------------------------------------------------------------------------------------------ 3 3C460.0 WFPC2 IMAGE LRF LRF 6348.8 CR-SPLIT=0.5 CR 1 2400S POS TARG 0.0, 0.0 MAX DUR 3000S MIN DUR -TOLERANCE=0.0 1200S EXPAND END ORBIT ------------------------------------------------------------------------------------------------------------------------------------ 5930( 0) - 07/18/95 18:43 - [ 6] Visit: 02 Visit Requirements: PCS MODE Fine 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 3C330.0 WFPC2 IMAGE PC1 F675W CR-SPLIT=0.5 CR 1 600S POS TARG 0.0, 0.0 MAX DUR 2000S MIN DUR -TOLERANCE=0.0 300S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 3C330.0 WFPC2 IMAGE PC1 F380W CR-SPLIT=0.5 CR 1 1200S POS TARG 0.0, 0.0 MAX DUR 2000S MIN DUR -TOLERANCE=0.0 600S EXPAND END ORBIT ------------------------------------------------------------------------------------------------------------------------------------ 3 3C330.0 WFPC2 IMAGE LRF LRF 7761 CR-SPLIT=0.5 CR 1 2400S POS TARG 0.0, 0.0 MAX DUR 3000S MIN DUR -TOLERANCE=0.0 1200S EXPAND END ORBIT ------------------------------------------------------------------------------------------------------------------------------------ 5930( 0) - 07/18/95 18:43 - [ 7] Visit: 03 Visit Requirements: PCS MODE Fine ORIENT 261D TO 301D On Hold Comments: Additional Comments: ORIENT 81D TO 121D ALSO ACCEPTABLE. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 3C79.0 WFPC2 IMAGE PC1 F547M CR-SPLIT=0.5 CR 1 600S POS TARG 0.0, 0.0 MAX DUR 2000S MIN DUR -TOLERANCE=0.0 300S EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 2 3C79.0 WFPC2 IMAGE PC1 F300W CR-SPLIT=0.5 CR 1 1200S POS TARG 0.0, 0.0 MAX DUR 2000S MIN DUR -TOLERANCE=0.0 600S EXPAND END ORBIT ------------------------------------------------------------------------------------------------------------------------------------ 3 3C79.0 WFPC2 IMAGE LRF LRF 6290 CR-SPLIT=0.5 CR 1 2400S POS TARG 0.0, 0.0 MAX DUR 3000S MIN DUR -TOLERANCE=0.0 900S EXPAND END ORBIT ------------------------------------------------------------------------------------------------------------------------------------ 5930( 0) - 07/18/95 18:43 - [ 8] Summary Form for Proposal 5930 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=0.5 CR-TOLERANCE=0.0 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category AGN ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE Fine POS TARG 0.0, 0.0 MAX DUR 2000S MIN DUR 300S EXPAND POS TARG 0.0, 0.0 MAX DUR 2000S MIN DUR 600S EXPAND END ORBIT POS TARG 0.0, 0.0 MAX DUR 3000S MIN DUR 1200S EXPAND END ORBIT PCS MODE Fine ORIENT 261D TO 301D POS TARG 0.0, 0.0 MAX DUR 3000S MIN DUR 900S EXPAND END ORBIT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F547M F300W LRF F675W F380W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 3C460.0 3C330.0 3C79.0 ------------------------------------------------------------------------------------------------------------------------------------