11831( 5) - 04-Jun-2009 14:24:52 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11831 Version: 5 Check-in Time: 04-Jun-2009 14:24:52 STScI Edit Number: 2 Title Probing X-Ray Jet Emission Mechanisms in a Complete Blazar Sample ------------------------------------------------------------------------------------ Type Cycle GO 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Preeti Kharb Purdue University CoI: Dr. Herman L. Marshall Massachusetts Institute of Technology N CoI: Dr. Matthew lister Purdue University N ------------------------------------------------------------------------------------ Abstract We propose deep (70 ksec) followup Chandra X-ray observations and new HST ACS/WFC/F475W observations of two quasars, viz., 0106+013 and 1641+399, belonging to the complete flux-limited MOJAVE Chandra blazar sample. These two quasars have HST WFPC2/F702W data available in the archive. Combining the existing optical and radio data with the new Chandra and HST data at an additional optical band we aim to construct a significantly more accurate multi-waveband (four frequency) spectral energy distributions for distinct knots in the jets. This will serve as a first step towards resolving longstanding ambiguities surrounding the primary X-ray emission mechanisms in a well-defined sample of powerful FR-II class jets. ------------------------------------------------------------------------------------ Observations Description ------------------------ In this proposal, we aim to observed the two quasars, 0106+013 and 1641+399, with ACS/WFC through the F475W filter. Both the quasars have previously been observed with HST WFPC2/F702W. While the HST archival data on 0106+013 are unpublished, jet features have been detected in 1641+399 by Sambruna et al. (2004). Using the optical knot flux densities listed in Sambruna et al. (2004), which are typically of the order of 0.3 microJy in the R-band (F702W), we have estimated that ~2700 seconds will yield a B-band (F475W) detection with a signal-to-noise ratio ~15 for the sources. Therefore, with one HST orbit per target we expect to obtain optical spectral indices with errors ~0.1 for both the sources, which will provide an essential constraint for the unambiguous interpretation of their broad-band SEDs. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 11831( 5) - 04-Jun-2009 14:24:52 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 1641+399 GALAXY, ELLIPTICAL, RA=16H42M58.8000S +/- 0.1", J2000 Z = V = 16.6 JET, QUASAR DEC=+39D48'37.00" +/- 0.1" 0.5928 Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 2 0106+013 GALAXY, ELLIPTICAL, RA=01H08M38.8000S +/- 0.1", J2000 Z = V = 18.34 JET, QUASAR DEC=+01D35'0.00" +/- 0.1" 2.099 Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 11831( 5) - 04-Jun-2009 14:24:52 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 11831( 5) - 04-Jun-2009 14:24:52 - [ 4] Visit: 01 Visit Requirements: ORIENT 127D TO 167. D; ORIENT 307D TO 347 D On Hold Comments: Additional Comments: Observing 1641+399 PA of jet in 1641+399 = 325D Offset = 2D ORIENT = 327D +/- 20D = 307D TO 347D also ORIENT = 127D TO 167D We have allowed a larger range of angles (+/- 20D) because jet is short. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 1641+399 ACS/WFC ACCUM WFC1 F475W 1 2700 S PATTERN 1 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ 1641+399 1 ACS/WFC ACCUM WFC1 F475W 1 none none none 1 570.0 S 1641+399 1 ACS/WFC ACCUM WFC1 F475W 2 none none none 1 570.0 S 1641+399 1 ACS/WFC ACCUM WFC1 F475W 3 none none none 1 570.0 S 1641+399 1 ACS/WFC ACCUM WFC1 F475W 4 none none none 1 570.0 S 11831( 5) - 04-Jun-2009 14:24:52 - [ 5] Visit: 02 Visit Requirements: ORIENT 82D TO 112 D; ORIENT 262D TO 292 D On Hold Comments: Additional Comments: Observing 0106+013 PA of jet in 0106+013 = 95D Offset = 2D ORIENT = 97D +/- 15D = 82D TO 112D also ORIENT = 262D TO 292D Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 0106+013 ACS/WFC ACCUM WFC1 F475W 1 2700 S GS ACQ SCENARIO SINGLE; see below PATTERN 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ 0106+013 1 ACS/WFC ACCUM WFC1 F475W 1 none none none 1 575.0 S 0106+013 1 ACS/WFC ACCUM WFC1 F475W 2 none none none 1 575.0 S 0106+013 1 ACS/WFC ACCUM WFC1 F475W 3 none none none 1 575.0 S 0106+013 1 ACS/WFC ACCUM WFC1 F475W 4 none none none 1 575.0 S 11831( 5) - 04-Jun-2009 14:24:52 - [ 6] Summary Form for Proposal 11831 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO SINGLE, ORIENT 127D TO 167. D, ORIENT 262D TO 292 D, ORIENT 307D TO 347 D, ORIENT 82D TO 112 D, PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F475W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 0106+013, 1641+399 ------------------------------------------------------------------------------------------------------------------------------------