Assigned ID: 832 ----- Attempting Submission 1 (Fri Feb 26 23:55:02 GMT 2010) ----- HST Phase I Proposal 832 (PictorA.apt) successfully submitted. ORIENTs were defined in order to avoid a problem where the jet lines up with the gap between the UVIS CCDs. The observability windows are slightly more restrictive now, reducing the current window by about 20%. ----- Attempting Submission 1 (Fri Jul 09 17:59:42 GMT 2010) ----- HST Phase II Proposal 12261 (pictorA_phase2.apt) successfully submitted. ----- Attempting Submission 2 (Mon Nov 15 18:50:46 GMT 2010) ----- Resolving the Pictor A Jet We are proposing to obtain new images of the Pictor A jet in order to measure the spatial scale of clumping and to search for variability. X-ray images show a jet that has an opening angle of less than 1 degree that is about 2' (84 kpc, projected) long, unresolved for the first 30-40", and marginally detectable out to the terminal hotspot that is 4.2' from the core. The brightest portions of the inner jet are also marginally detectable in radio images. Based on a synchrotron model of the X-ray emission, we estimate that the bright parts of the inner jet should be detectable in the optical and IR in short HST observations with the WFC3. Three bandpasses will provide sufficient information on each knot to determine the synchrotron cutoffs, if it is in the optical band.
We plan to use two orbits of HST time using the WFC3. One orbit would be used for one filter (F160W) with the IR channel and the second orbit would be used for two filters of the UV channel: F475W and 814W. For the IR channel, filter F160W, a 3000 s exposure yields a 34$\sigma$ detection for the brightest part of the jet and 3.5$\sigma$ for point sources $\times 10$ fainter than the peak, even with our conservative flux estimates. Using the WFC3 UV channel exposure time calculator for filter F475W, we find a SNR of 19 for the peak of the jet in 1100 s and a similar SNR for filter 814W. Point sources $\times 8$ fainter than the peak will be detectable at 3$\sigma$ and again, our conservative estimates indicate that many of the jet knots and diffuse emission should be at least this bright. AGN/QUASARS 12 false 0.0 0.0 false false false false false false SUPPORTED GALAXY JET KNOT RADIO GALAXY The pointing position is 1arcmin from the position of Pictor A along a position angle of -78.8deg, where 0deg is due north and positive is to the east. Core is 19th magnitude. Knot fluxes in the range 50-1000 nJy at 1.6 microns, 0.2-4.0 microJy at 475 Angstroms J2000 05 19 44.6260 -45 46 32.00 J2000 WFC3/IR Imaging No No F160W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F475W POS-TARG DITHER 0.605 LINE false false 3 41.788 WFC3-IR-DITHER-LINE-3PT 3 false POS-TARG DITHER 0.135 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 5 false /private/var/folders/57/57VodgYZ2RW8Nk+1YwAbC++++TY/-Tmp-/OPVisit8888156713058276264.xml The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12261 :visit-id "01" :proposal-version -1 :trans-version "20100505" :date "15-Nov-2010 13:20:29.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 2306992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12261 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12261 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2875 :al-overhead-at-end 0 :internal-dur-at-end 65 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3391 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12261 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3167 :al-overhead-at-end 116 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3391 :pcs-gap 0 ) true 2 0