10541( 5) - 10/12/05 10:34 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10541 Version: 5 Check-in Time: 12-Oct-2005 14:34:00 Title Probing the jet mattter content of quasar PKS 0637-752 ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 14 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Markos Georganopoulos University of Maryland Baltimore County CoI: Dr. Eric S. Perlman University of Maryland Baltimore County Y CoI: Dr. Demosthenes Kazanas NASA Goddard Space Flight Center N CoI: Dr. Floyd W. Stecker NASA Goddard Space Flight Center N ------------------------------------------------------------------------------------ Abstract The matter content (electron-proton vs electron-positron composition) of extragalactic jets remains unknown, despite over three decades of work. Here, we propose NICMOS/NIC3 and ACS observations of the Chandra-detected, one sided jet of the superluminal quasar PKS 0637-752 to derive the jet matter content by measuring the component of the Cosmic Microwave Background (CMB) radiation that is bulk- Comptonized (BC) by the cold electrons in the relativistically flowing large scale jet. What makes this source particularly suited for this procedure, is the absence of significant non-thermal jet emission from the 'bridge', the region between the core and the first bright knot WK7.8, guaranteeing that most of the electrons in the bridge are cold, leaving the BC scattered CMB radiation as the only significant source of photons in this region. The proposed NICMOS and ACS observations of the knot WK7.8 will provide spectral information in the IR-UV regime, which, together with existing multiwavelength data, will be used to derive the jet Doppler factor and minimum power necessary to power the knot emission as a function of the jet matter content. These will in turn be used to deduce, or strongly constrain, the actual jet matter content through comparison with the proposed NICMOS observations of the BC 'bridge' emission. ------------------------------------------------------------------------------------ 10541( 5) - 10/12/05 10:34 - [ 2] Observations Description ------------------------ We propose NICMOS and ACS observations of the single-sided jet in quasar PKS 0637-752. For the NICMOS observations we have selected NIC3, because its large pixel size makes is ideal for detecting extended low brightness sources, such as the BC emission from the bridge connecting the core and the first knot WK7.8 of PKS 0637-752. More specifically, we propose a 7500s (3 orbit) observation of PKS 0637-752 with NIC3 using the F160W filter. According to the NICMOS Exposure Time Calculator, this will yield a S/N=3.00 for knot f_1.6 mu m=2.72 e-8 Jy. Also, for the same configuration, an extended source will be detectable at S/N=3.00 for f_1.6 mu m= 1.62e-7 Jy /arcsec^2. We also propose a 2500s (1 orbit) observation of PKS 0637-752 with WFC of ACS using the F475W filter. According to the ACS Exposure Time Calculator, this will yield a S/N=3.01 for f_4800 \AA=2.01e-8 Jy. In both the NICMOS and ACS calculations we assumed a power law spectrum F_nu ~nu^(-1), although the results did not change significantly for a range of plausible spectral indexes. These flux limits are sufficiently deep to guarantee the detection of the knots, and to ensure that the detection of or the deep flux limit imposed on the BC emission from the bridge will be sufficient to deduce or strongly constrain the jet matter content. We will also perform a short (1 min) ACS observation to obtain the flux of the quasar core. This will help us subtract the PSF, which will be important in detecting any inner jet emission. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10541( 5) - 10/12/05 10:34 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PKS-0637-752 GALAXY, JET, KNOT, RA=06H35M46.5079S +/- 0.1", J2000 V = 15.75 QUASAR, RADIO GALAXY DEC=-75D16'16.82" +/- 0.1" Coordinate Source: Other_Source: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. 10541( 5) - 10/12/05 10:34 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.145 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 47.23 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type NIC-XSTRIP-DITH Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 1.0 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 0.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 10541( 5) - 10/12/05 10:34 - [ 5] Visit: 01 Visit Priority: Visit Requirements: ORIENT 200.0D TO 250.0 D; ORIENT 110.0D TO 160.0 D; ORIENT 20.0D TO 70.0 D; ORIENT 290.0D TO 340.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PKS-0637-75 ACS/WFC ACCUM WFC1-1K F475W CR-SPLIT=2 1 60 S 2 see below ------------------------------------------------------------------------------------------------------------------------------------ 2 PKS-0637-75 ACS/WFC ACCUM WFC1-1K F475W CR-SPLIT=2 1 600 S PATTERN 1 2 2 see below ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ PKS-0637-752 1 ACS/WFC ACCUM WFC1-1K F475W none none none 1 1 50.0 S PKS-0637-752 1 ACS/WFC ACCUM WFC1-1K F475W none none none 2 1 50.0 S PKS-0637-752 2 ACS/WFC ACCUM WFC1-1K F475W 1 none none 1 1 614.0 S PKS-0637-752 2 ACS/WFC ACCUM WFC1-1K F475W 1 none none 2 1 614.0 S PKS-0637-752 2 ACS/WFC ACCUM WFC1-1K F475W 2 none none 1 1 614.0 S PKS-0637-752 2 ACS/WFC ACCUM WFC1-1K F475W 2 none none 2 1 614.0 S 10541( 5) - 10/12/05 10:34 - [ 6] Visit: 02 Visit Priority: Visit Requirements: ORIENT 20.0D TO 70.0 D; ORIENT 110.0D TO 160.0 D; ORIENT 200.0D TO 250.0 D; ORIENT 290.0D TO 340.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PKS-0637-75 NIC3 MULTIAC NIC3 F160W NSAMP=22,SAMP-SEQ=STEP256 1 DEF GS ACQ SCENARIO BASE1TNS; 2 CUM PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ PKS-0637-752 1 NIC3 MULTIAC NIC3 F160W 1 none none none 1 N/A CUM PKS-0637-752 1 NIC3 MULTIAC NIC3 F160W 2 none none none 2 N/A CUM PKS-0637-752 1 NIC3 MULTIAC NIC3 F160W 3 none none none 3 N/A CUM 10541( 5) - 10/12/05 10:34 - [ 7] Visit: 03 Visit Priority: Visit Requirements: SAME ORIENT AS 02 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PKS-0637-75 NIC3 MULTIAC NIC3 F160W NSAMP=22,SAMP-SEQ=STEP256 1 DEF GS ACQ SCENARIO BASE1TNS; 2 CUM PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ PKS-0637-752 1 NIC3 MULTIAC NIC3 F160W 1 none none none 1 N/A CUM PKS-0637-752 1 NIC3 MULTIAC NIC3 F160W 2 none none none 2 N/A CUM PKS-0637-752 1 NIC3 MULTIAC NIC3 F160W 3 none none none 3 N/A CUM 10541( 5) - 10/12/05 10:34 - [ 8] Summary Form for Proposal 10541 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1-1K NIC3 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC NIC3 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2 NSAMP=22 SAMP-SEQ=STEP256 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 200.0D TO 250.0 D; ORIENT 110.0D TO 160.0 D; ORIENT 20.0D TO 70.0 D; ORIENT 290.0D TO 340.0 D PATTERN 1 2 ORIENT 20.0D TO 70.0 D; ORIENT 110.0D TO 160.0 D; ORIENT 200.0D TO 250.0 D; ORIENT 290.0D TO 340.0 D GS ACQ SCENARIO BASE1TNS; PATTERN 2 1 SAME ORIENT AS 02 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F475W F160W ------------------------------------------------------------------------------------------------------------------------------------ Target Names PKS-0637-752 ------------------------------------------------------------------------------------------------------------------------------------