! +====================+ ! | PED OUTPUT PRODUCT | ! +====================+ ! ! /data/frodo1/aroman/work/6510.prop ! Generated by PREPROCESSOR, version 7.1.1a ! Date: Tue Jun 10 11:09:55 EDT 1997 Proposal_Information Title: The Spatially Extended Featureless Continuum Source of Cygnus A: Multicolor Imaging in Total Flux and Polarization Proposal_Category: GO Scientific_Category: AGN Cycle: 6 Investigators PI_Name: Robert Antonucci PI_Institution: University of California, Santa Barbara CoI_Name: Anne Kinney CoI_Institution: Space Telescope Science Institute Contact: CoI_Name: Todd Hurt CoI_Institution: University of California, Santa Barbara Contact: Abstract: We would like to obtain multicolor flux and polarization images of the powerful prototype Classical Double radio galaxy Cygnus A. Ground based data and several brief HST images show that the nuclear featureless continuum (FC) source is fully resolved spatially. From the proposed images and our HST UV spectrum, we hope to distinguish among emission mechanisms, test definitively whether the UV continuum is reflected light from a hidden quasar, and investigate the important new phenomenon of spatially extended but nonstellar and unpolarized optical emission. Questions Observing_Description: Unfortunately, Cygnus A is quite faint. The F342W post-CoStar FOC exposure (Fig. 1) indicates that the SE (featureless- continuum-emitting) nucleus has a total flux of only 2.6 * 10^-17 erg/sec cm^2Angstrom, spread out over a region approximately 1buildrel ''over.2 * 2buildrel ''over.2 in size. We can expect to get a high-resolution polarization map only in the hotter filter (F342W). For the F275W filter, we will get full resolution total flux images but the polarization will have to be binned up to ground-based resolution. Reflected off-nuclear light is generally highly polarized, \\\\\\\\gtwid10\\\\\\\\%. In the F342W filter, if the flux were smoothly distributed, the FOC simulator says that in a 0buildrel ''over.1 * 0buildrel ''over.1 box, through the polarizers, we'd get SNR=4.2 in 1 hour in the combined total flux image. I NOW MULTIPLY THIS BY 1.45^.5, BASED ON THE FORMAT -DEPENDENT SENSITIVITY, TABLE 11 OF THE FOC HANDBOOK, ADOPTING THE 512z x 512 FORMAT, RESULTING IN SNR=5.1. This is based on the flux and size of the FC source quoted above. For the error in fractional P, we invert and multiply by root 2 and scale according to exposure time and solid angle of binning. Specifically, in 5 hours, binning the Stokes maps by 0buildrel ''over.4, we'd get an error in P of 2.2\\\\\\\\%. Since the mirrors are generally localized (e.g. Capetti et al. 1995, ApJ, 446, 155 on FOC polarization imaging of NGC1068), the situation may actually be considerably better. The total flux SNR in 0buildrel ''over.1 bins will be 11.3. The other filter is taken to get full-resolution flux images for colors, and also to get wavelength-dependence of P. We will just expose long enough to get P in coarsely binned data. The F275W will have important new information in the flux images and gross binning in total flux in undesirable. The simulator corrected for Table 11 says we'll get SNR=5.4 in each 0buildrel ''over.1 * 0buildrel ''over.1 box in 5 hours. This corresponds to a polarization uncertainty of 2.6\\\\\\\\% in bins of one square arcsec. (For the flux at 2750Angstrom, we have extrapolated by F_nu\\\\\\\\proptoNu^- 1, and confirm that the result agrees with our spectrum.) For the red, we just need satisfactory archival total-flux images for subtraction purposes (see Sci. Just.). Macchetto's 1200 sec FOC/CoStar F430W or Westphal's 1800 sec PC2 F622W is suitable. For each filter (F275W and F342W), we would like a series of FOC polarization images, taking exposures with POL0, POL60, and POL120. Format should be 512z x 512, if it's correct that this gives an adequate 7"x14" field at highest sensitivity. The long axis should be within 30 degrees of the structural axis of Cygnus A, which is at 105 deg. The visibility period for our target is 54 min. We will acquire guide stars and take a single-polarization-filter image during an orbit for the rest of the available time (allowing 7 min imaging overhead). The result is 39.5 min available for the first orbit, and 41 min for succeeding ones (reduced guide-star acq time). In 2 sets of 3 orbits (for each polarizer) we accumulate ~4 hrs exp. in F275W; then in 3 sets of 3 we accumulate ~6 hours in F342W. Sets of 3 orbits at least should be continuous for minimizing polarization systematics. The very slightly lower exp time in POL0 than in POL60 and POL120 is fine, and can be compensated by a slight scaling in the reductions. Real_Time_Justification: Calibration_Justification: Additional_Comments: Please check our reasoning carefully. Fixed_Targets Target_Number: 1 Target_Name: CYGNUS-A Alternate_Names: 3C405 Description: GALAXY,RADIO GALAXY Position: RA=19H 59M 28.47S +/- .05S,DEC=40D 44' 2.21" +/- .5",PLATE-ID=003S Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0.0 Flux: V = 15.1+/-.3 F(3460)=5.0+/-2.0e-17 Comments: Solar_System_Targets Generic_Targets Scan_Data Visits Visit_Number: 01 Visit_Requirements: ORIENT 109D TO 169D On_Hold_Comments: Visit_Comments: Please check our ORIENT parameters: we want the long 14" axis of the FOV to be roughly along a true p.a. of 105D. The format must be 512z x 512 as we understand it, but that's not an option under APERTURE. Exposure_Number: 1 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: F342W,POL0 Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 46 M Special_Requirements: Comments: Exposure_Number: 2 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: F342W,POL60 Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 48 M Special_Requirements: Comments: Exposure_Number: 3 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: F342W,POL120 Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 48 M Special_Requirements: Comments: Exposure_Number: 4 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: F342W,POL0 Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 48 M Special_Requirements: Comments: Exposure_Number: 5 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: F342W,POL60 Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 48 M Special_Requirements: Comments: Exposure_Number: 6 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: F342W,POL120 Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 48 M Special_Requirements: Comments: Exposure_Number: 7 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: F342W,POL0 Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 48 M Special_Requirements: Comments: Exposure_Number: 8 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: F342W,POL60 Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 48 M Special_Requirements: Comments: Exposure_Number: 9 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: F342W,POL120 Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 48 M Special_Requirements: Comments: Visit_Number: 02 Visit_Requirements: ORIENT 109D TO 169D On_Hold_Comments: Visit_Comments: Exposure_Number: 10 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: F275W,POL0 Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 46 M Special_Requirements: Comments: Exposure_Number: 11 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: POL60,F275W Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 48 M Special_Requirements: Comments: Exposure_Number: 12 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: POL120,F275W Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 48 M Special_Requirements: Comments: Exposure_Number: 13 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: POL0,F275W Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 48 M Special_Requirements: Comments: Exposure_Number: 14 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: POL60,F275W Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 48 M Special_Requirements: Comments: Exposure_Number: 15 Target_Name: CYGNUS-A Config: FOC/96 Opmode: IMAGE Aperture: 512X512 Sp_Element: POL120,F275W Wavelength: Optional_Parameters: PIXEL=50x25 Number_of_Iterations: 1 Time_Per_Exposure: 48 M Special_Requirements: Comments: Data_Distribution ! Defaults indicated; change if desired Medium: 8MM Ship_To: Phys Dept, UCSB, Santa Barbara CA 93106 Recipient_Email: __Diagnostic-Sum-Section__ Software-Version (Controller= 6.0a) Preprocessor (Errors= 1 Fatal-Errors= 0 ) Validation (Errors= 0 Fatal-Errors= 0 ) Transformation (Errors= 0 Fatal-Errors= 0 ) CASM (Errors= 0 Fatal-Errors= 0 ) __User-Comments__ I think the only problem with this is the request for 9 orbits in Visit 1. If it's possible to cheat on the 8 visit limit, it would be very helpful to do so. The reason is that these polarization images must come in sets of 3. If it's impossible please let me know and I will break it up intomore visits. One thing I haven't done is to ask for flats during Earth occulation. I'm getting nervous about the deadline, so I submit this now, but I'll try to figure out how to insert the flats. As noted, there are some things I'd like you to check carefully ... A big worry is that our previous imaging pol program generally missed the targets by several arcsec...which COULD be a disaster if along the narrow direction of the FOV. ! Let us know what you think of this template and software! ! Please send a list of your likes and dislikes to your Program Coordinator