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.

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 While the HST archival data on 0106+013 are unpublished, jet features have been detected in 1641+399 by Sambruna et al.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. 12 false 0.0 0.0 false false false false false SUPPORTED GALAXY ELLIPTICAL JET QUASAR This object was generated by the targetselector and retrieved from the NED database. 3C345 J2000 00 00 0.0000 +00 00 0.00 J2000 GALAXY ELLIPTICAL JET QUASAR This object was generated by the targetselector and retrieved from the NED database. 4C+01.02 J2000 00 00 0.0000 +00 00 0.00 J2000 POS-TARG DITHER 0.265 LINE 0.187 false false 69.05 4 20.67 ACS-WFC-DITHER-BOX 1 false The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 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. (Tic-Visit :proposal-id 11831 :visit-id "01" :proposal-version -1 :trans-version "20090130" :date "20-Mar-2009 11:02:23.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11831 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11831 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2974 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. Observing 0106+013 PA of jet in 0106+013 = 95D Offset = 2D ORIENT = 97D +/- 15D = 82D TO 112D also ORIENT = 262D TO 292D (Tic-Visit :proposal-id 11831 :visit-id "02" :proposal-version -1 :trans-version "20090130" :date "20-Mar-2009 11:10:48.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11831 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11831 :visit-id "02" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2994 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) false 1 0