15376( 2) - 08-Sep-2017 19:05:04 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15376 Version: 2 Check-in Time: 08-Sep-2017 19:05:04 STScI Edit Number: 0 Title The X-ray-radio morphology anomaly in a high-redshift quasar jet ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Diana Worrall University of Bristol Y CoI: Prof. Mark Birkinshaw University of Bristol N CoI: Dr. Daniel A. Schwartz Smithsonian Institution Astrophysical N Observatory CoI: Dr. Herman L. Marshall Massachusetts Institute of Technology N CoI: Prof. John Wardle Brandeis University N CoI: Dr. Aneta Siemiginowska Smithsonian Institution Astrophysical N Observatory ------------------------------------------------------------------------------------ Abstract We propose a 130-ks observation with Chandra of the exceptional kpc-scale X-ray jet associated with a radio-loud quasar at redshift 3.689. This quasar was selected from a radio/X-ray archival study based on its unusual X-ray brightness and the strong difference between its X-ray and radio morphologies. The existing 3.3-ks Chandra exposure shows a ribbon-like X-ray structure offset from the radio jet, and an unusually high X-ray jet to core flux ratio. We wish to support the new Chandra observation with short JVLA and HST observations. The modeling possible from the new data will be important for the debate concerning a synchrotron or inverse Compton origin for the X-rays of high-redshift quasar jets, and should strongly constrain the source energetics. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will use one HST orbit to image quasar J1421-0643 using WFC3/UVIS to constrain the radio-to-X-ray spectrum of its unusual jet. 22.5 min of exposure with the F555W filter should detect the jet with signal/noise > 3 in 0.4 arcsec detection cells. 16.3 min of exposure with the F814W filter will provide independent confirmation of any faint structure and constrain the jet spectral index. WFC3/UVIS is preferred to ACS to avoid two bright stars in the neighbourhood of J1421-0643. We use dither patterns WFC3-UVIS-DITHER-LINE-3PT with F555W and WFC3-UVIS-DITHER-LINE with F814W to remove hot columns and cosmic rays in the data. Post-observation FLASH=2 is used to improve CTE for F814W. ORIENT is used to move the jet (which lies in position angle 0 - 35 deg from the quasar core, and extends 5 arcsec) away from the diffraction spikes and columns that might bleed charge from the quasar core. POS TARG is used to move the quasar 10 arcsec further from the chip gap so that its full environment is well imaged. ------------------------------------------------------------------------------------ 15376( 2) - 08-Sep-2017 19:05:04 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 J1421-0643 GALAXY, QUASAR RA=14H21M7.8000S, J2000 Z = V = 18.97 +/- 0.04 DEC=-06D43'56.30" 3.689 Reference Frame: ICRS Extended: NO Comments: Quasar core is point-like. Faint jet-like structure in position angle range 0 - 35 deg, extending 5 arcsec, is main target. ------------------------------------------------------------------------------------------------------------------------------------ 15376( 2) - 08-Sep-2017 19:05:04 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.145 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO Pattern_Comments: Dither for CR removal ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.135 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO Pattern_Comments: Dither for CR removal. ------------------------------------------------------------------------------------------------------------------------------------ 15376( 2) - 08-Sep-2017 19:05:04 - [ 4] Visit: 01 (J1421-visit) Visit Requirements: ORIENT 40D TO 85 D; ORIENT 157D TO 175 D; ORIENT 220D TO 265 D; ORIENT 337D TO 355 D On Hold Comments: Additional Comments: Main observation in F555W. Subsidiary/confirmation observation in F814W. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 J1421-0643 WFC3/UVI ACCUM UVIS F555W 1 450 S POS TARG null, 10.0; S (1350 S) PATTERN 2 1 Comments: Primary science exposure ------------------------------------------------------------------------------------------------------------------------------------ 2 J1421-0643 WFC3/UVI ACCUM UVIS F814W FLASH=2 1 490 S (980 POS TARG null, 10.0; S S) PATTERN 1 2 Comments: Confirmation exposure, spectral information. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ J1421-0643 1 WFC3/UVI ACCUM UVIS F555W 1 none none none 1 N/A S J1421-0643 1 WFC3/UVI ACCUM UVIS F555W 2 none none none 1 N/A S J1421-0643 1 WFC3/UVI ACCUM UVIS F555W 3 none none none 1 N/A S J1421-0643 2 WFC3/UVI ACCUM UVIS F814W 1 none none none 1 N/A S J1421-0643 2 WFC3/UVI ACCUM UVIS F814W 2 none none none 1 N/A S 15376( 2) - 08-Sep-2017 19:05:04 - [ 5] Summary Form for Proposal 15376 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=2 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 157D TO 175 D, ORIENT 220D TO 265 D, ORIENT 337D TO 355 D, ORIENT 40D TO 85 D, PATTERN 1 2, PATTERN 2 1, POS TARG null, 10.0 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names J1421-0643 ------------------------------------------------------------------------------------------------------------------------------------