Science Keywords: Select from 2 to 5 items. At least one target must be specified in Phase I 0 Assigned ID: 3803 ----- Attempting Submission 1 (Tue Aug 30 15:04:50 GMT 2022) ----- Joint Chandra/HST 0 ----- Attempting Submission 1 (Fri Sep 30 20:18:47 GMT 2022) ----- Examining the Variability of High-Redshift Jets Recent work has shown that kpc-scale X-ray jets are variable on timescales of weeks to a few years. Variability places very strong constraints on the characteristics of the emitting region, and rules out inverse-Compton upscattered CMB as the origin for the unidentified hard X-ray component. However, very few X-ray jets at redshifts z>2 have the multiple Chandra observations required to test for variability. Here we propose moderate-depth snapshots (20 ks each) of 14 X-ray jets previously detected by Chandra with redshifts ranging from 2-5. This will enable both variability studies and better spectral constraints to understand the nature of extragalactic X-ray jets at high redshift. This is a joint request from a primary Chandra X-ray GO Program, targeting arcsecond-scale X-ray jets from super-massive black holes. This program provides Hubble near-IR observations of 4 of our targets (1 orbit each) which have never previously been observed by HST. This will bring our high-redshift sample of 13 to complete optical/IR coverage as all other targets have previously been observed by HST. A detection or upper limit in the optical will allow us to actually evaluate the full SED of these sources and verify the number of spectral components. A single orbit will yield a deep enough upper limit (0.1 uJy at 160 nm at 3 sigma) to clearly indicate that the X-rays and radio are not from the same emission component, and a detection will similarly allow us to evaluate the spectral components. HST resolution is needed in order to accurately measure the radio-optical spectrum for each knot individually (good radio maps of all our sources already exist). We request a single orbit with WFC3 in the F160W filter. H band is ideally situated very near to the typical peak of the radio-optical synchrotron spectrum when optical emission is detected. n/a Supermassive Black Holes and Active Galaxies 6 false false false false false false false SUPPORTED GALAXY JET QUASAR RADIO GALAXY YES This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY JET QUASAR RADIO GALAXY YES This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY JET QUASAR RADIO GALAXY YES This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY JET QUASAR RADIO GALAXY This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W POS-TARG DITHER DITHER 4 5.183 WFC3-IR-DITHER-BOX-MIN false 74.653 true 0.365 0.572 4 41.859 POS-TARG WFC3-IR-DITHER-BLOB 18.528 1 false /tmp/OPVisit3740325815813344396.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. The science target, the X-ray emitting jet, extends out approximately 40" so a sub-array cannot be used to limit persistence. The selected exposure times are a compromise between saturating targets in the FOV and efficiency as shorter times would result in significant reduction in total time. There is a H-mag 14.5 source about 6" from the center of the target. 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(Tic-Visit :proposal-id 17241 :visit-id "03" :proposal-version -1 :trans-version "20220630" :date "30-Sep-2022 22:29:59.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1810544 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17241 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17241 :visit-id "03" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2756 :al-overhead-at-end 0 :internal-dur-at-end 576 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) true 1 0 /home/meyer/Dropbox/Research/proposals/2022/Chandra_var/hst_17241-phase2/OP-cache/hst17241-v04.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. 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