15480( 3) - 15-Aug-2018 13:43:15 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15480 Version: 3 Check-in Time: 15-Aug-2018 13:43:15 STScI Edit Number: 0 Title A cosmic dance at high redshift - Resolving the host galaxies of a 20kpc separation dual AGN system at z=3.3 with WFC3/IR ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Bernd Husemann Max-Planck-Institut fur Astronomie, Y Heidelberg CoI: Dr. Gabor Worseck Universitat Potsdam N CoI: Dr. Fabrizio Arrigoni Battaia European Southern Observatory - Germany N CoI: Dr. Knud Jahnke Max-Planck-Institut fur Astronomie, N Heidelberg CoI: Prof. Tom Shanks Durham Univ. N CoI: Dr. Rich Bielby Durham Univ. N ------------------------------------------------------------------------------------ Abstract We recently discovered that the unobscured QSO LBQS0302-0019 at z=3.286 is actually a dual AGN with an obscured component (dubbed Jil) at 20kpc projected distance. This is the tightest unobscured/obscured dual AGN known at z>3. Subsequently, we detected a galaxy at the location of Jil in a deep K-band image taken during science verification of the adaptive optics system for VLT/HAWK-I in January 2018. The image reveals that both AGN live in massive galaxies as expected for bright AGN at z=3.3. As a natural next step we propose for WFC3/IR F125W observations with HST to 1) resolve the morphology of the two AGN host galaxies at a resolution of 0.1" (4x times better than from ground), 2) detect potential tidal features given the depth provided by HST, and 3) obtain the F125W-K (U-V rest-frame) color which is a proxy for the age and mass-to-light ratio supporting accurate stellar mass measurements. This information is crucial to characterize this extraordinary cosmic dance of these two high-redshift galaxies, particularly, its current interaction stage and stellar mass. The big questions here are: 1) Is the host galaxy of Jil a single distorted galaxy or a merger of two? 2) Did the two galaxies form the majority of their young stars before or after their close encounter? 3) What is the mass ratio and total stellar mass of the system? 4) Is this system hosted by one of the most massive halos at this redshift? With the proposed HST observations this newly discovered dual AGN system will turn into a unique laboratory to understand how massive galaxies and their super-massive black holes formed through merging at high redshift and what role AGN play for their evolution. ------------------------------------------------------------------------------------ Observations Description ------------------------ The observations are aiming to obtain a single high S/N WFC3/IR F125W image of the dual AGN system LBQS 0302-0019. Given a limiting surface brightness of 22mag/arcsec2 (Vega) we compute a minimum exposure time of 8000sec for WFC3/IR F125W if split into 72 individual exposures. The large number of frames are necessary to achieve 1) a good sampling of the PSF and 2) a high contrast imaging for a bright QSO with m_K=15.4mag (Vega). 15480( 3) - 15-Aug-2018 13:43:15 - [ 2] The brightness of the QSO is reaching the saturation level already at 50s long exposures and the sampling of the PSF demands several dithered exposures. The current observing strategiy therefore takes a sequence of short exposures first, followed by a sequence of long exposures which both properly sample the PSF. The short images can replace the saturated pixels of the QSO in the long exposures before combination. In practice we will apply the WFC-IR-DITHER-BLOB dither pattern (2 points separated by 3.2arcsec with the WFC-IF-DITHER-BOX-MIN pattern (4 points for optimal PSF sampling), which leads to 8 dither positions for each of the short and long exposure. For both exposures we will use the IRSUB256 aperture which provides a 25arcsec large FoV which is well sufficient to capture the system for all dither positions. We will employ the SPARS10 read-out sequence with 7 sampling points (i.e. 44sec exposure time) and the SPARS25 read-out sequence with 11 sampling points (i.e. 223sec exposure time) for the short and long exposures, respectively. At each dither position we will obtain 5 and 4 individual exposures for the short and long exposure sequences, respectively. This observing sequence will accumulate in total 1760s of short exposures, aimed at the bright QSO nucleus, and 7136s of long exposures, aimed at the extended diffuse emission of the QSO host galaxy and companion Jil. ------------------------------------------------------------------------------------ 15480( 3) - 15-Aug-2018 13:43:15 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 LBQS-0302-00 GALAXY, HIGH REDSHIFT RA=03H04M49.8576S, J2000 V = 18.0 19 GALAXY, INTERACTING DEC=-00D08'13.49" GALAXY, QSO Reference Frame: Other: NED Extended: YES Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 15480( 3) - 15-Aug-2018 13:43:15 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BLOB WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER DITHER Number_Of_Points 2 4 Point_Spacing 6.183 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 41.859 18.528 Angle_Between_Sides 74.653 Center_Pattern YES NO ------------------------------------------------------------------------------------------------------------------------------------ 15480( 3) - 15-Aug-2018 13:43:15 - [ 5] Visit: 01 Visit Requirements: SCHED 30% On Hold Comments: Additional Comments: 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 LBQS-0302-0 WFC3/IR MULTIAC IRSUB256 F125W SAMP-SEQ=SPARS10, NSAMP=7 1 DEF PATTERN 2 1-5 019 CUM (354.854 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 LBQS-0302-0 WFC3/IR MULTIAC IRSUB256 F125W SAMP-SEQ=SPARS10, NSAMP=7 1 DEF 019 CUM (354.854 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LBQS-0302-0 WFC3/IR MULTIAC IRSUB256 F125W SAMP-SEQ=SPARS10, NSAMP=7 1 DEF 019 CUM (354.854 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 LBQS-0302-0 WFC3/IR MULTIAC IRSUB256 F125W SAMP-SEQ=SPARS10, NSAMP=7 1 DEF 019 CUM (354.854 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 LBQS-0302-0 WFC3/IR MULTIAC IRSUB256 F125W SAMP-SEQ=SPARS10, NSAMP=7 1 DEF 019 CUM (354.854 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 LBQS-0302-0 WFC3/IR MULTIAC IRSUB256 F125W SAMP-SEQ=SPARS25, NSAMP=11 1 DEF PATTERN 2 6-9 019 CUM (1789.906 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 LBQS-0302-0 WFC3/IR MULTIAC IRSUB256 F125W SAMP-SEQ=SPARS25, NSAMP=11 1 DEF 019 CUM (1789.906 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 LBQS-0302-0 WFC3/IR MULTIAC IRSUB256 F125W SAMP-SEQ=SPARS25, NSAMP=11 1 DEF 019 CUM (1789.906 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 LBQS-0302-0 WFC3/IR MULTIAC IRSUB256 F125W SAMP-SEQ=SPARS25, NSAMP=11 1 DEF 019 CUM (1789.906 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 LBQS-0302-0 WFC3/IR MULTIAC IRSUB256 F125W SAMP-SEQ=SPARS25, NSAMP=11 1 DEF 019 CUM (223.738 S) ------------------------------------------------------------------------------------------------------------------------------------ 15480( 3) - 15-Aug-2018 13:43:15 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ LBQS-0302-0019 1 WFC3/IR MULTIAC IRSUB256 F125W 1 1 none none 1 N/A CUM LBQS-0302-0019 1 WFC3/IR MULTIAC IRSUB256 F125W 1 2 none none 1 N/A CUM LBQS-0302-0019 1 WFC3/IR MULTIAC IRSUB256 F125W 1 3 none none 1 N/A CUM LBQS-0302-0019 1 WFC3/IR MULTIAC IRSUB256 F125W 1 4 none none 1 N/A CUM LBQS-0302-0019 1 WFC3/IR MULTIAC IRSUB256 F125W 2 1 none none 1 N/A CUM LBQS-0302-0019 1 WFC3/IR MULTIAC IRSUB256 F125W 2 2 none none 1 N/A CUM LBQS-0302-0019 1 WFC3/IR MULTIAC IRSUB256 F125W 2 3 none none 1 N/A CUM LBQS-0302-0019 1 WFC3/IR MULTIAC IRSUB256 F125W 2 4 none none 1 N/A CUM LBQS-0302-0019 2 WFC3/IR MULTIAC IRSUB256 F125W 1 1 none none 1 N/A CUM LBQS-0302-0019 2 WFC3/IR MULTIAC IRSUB256 F125W 1 2 none none 1 N/A CUM LBQS-0302-0019 2 WFC3/IR MULTIAC IRSUB256 F125W 1 3 none none 1 N/A CUM LBQS-0302-0019 2 WFC3/IR MULTIAC IRSUB256 F125W 1 4 none none 1 N/A CUM LBQS-0302-0019 2 WFC3/IR MULTIAC IRSUB256 F125W 2 1 none none 1 N/A CUM LBQS-0302-0019 2 WFC3/IR MULTIAC IRSUB256 F125W 2 2 none none 1 N/A CUM LBQS-0302-0019 2 WFC3/IR MULTIAC IRSUB256 F125W 2 3 none none 1 N/A CUM LBQS-0302-0019 2 WFC3/IR MULTIAC IRSUB256 F125W 2 4 none none 1 N/A CUM LBQS-0302-0019 3 WFC3/IR MULTIAC IRSUB256 F125W 1 1 none none 1 N/A CUM LBQS-0302-0019 3 WFC3/IR MULTIAC IRSUB256 F125W 1 2 none none 1 N/A CUM LBQS-0302-0019 3 WFC3/IR MULTIAC IRSUB256 F125W 1 3 none none 1 N/A CUM LBQS-0302-0019 3 WFC3/IR MULTIAC IRSUB256 F125W 1 4 none none 1 N/A CUM LBQS-0302-0019 3 WFC3/IR MULTIAC IRSUB256 F125W 2 1 none none 1 N/A CUM 15480( 3) - 15-Aug-2018 13:43:15 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ LBQS-0302-0019 3 WFC3/IR MULTIAC IRSUB256 F125W 2 2 none none 1 N/A CUM LBQS-0302-0019 3 WFC3/IR MULTIAC IRSUB256 F125W 2 3 none none 1 N/A CUM LBQS-0302-0019 3 WFC3/IR MULTIAC IRSUB256 F125W 2 4 none none 1 N/A CUM LBQS-0302-0019 4 WFC3/IR MULTIAC IRSUB256 F125W 1 1 none none 1 N/A CUM LBQS-0302-0019 4 WFC3/IR MULTIAC IRSUB256 F125W 1 2 none none 1 N/A CUM LBQS-0302-0019 4 WFC3/IR MULTIAC IRSUB256 F125W 1 3 none none 1 N/A CUM LBQS-0302-0019 4 WFC3/IR MULTIAC IRSUB256 F125W 1 4 none none 1 N/A CUM LBQS-0302-0019 4 WFC3/IR MULTIAC IRSUB256 F125W 2 1 none none 1 N/A CUM LBQS-0302-0019 4 WFC3/IR MULTIAC IRSUB256 F125W 2 2 none none 1 N/A CUM LBQS-0302-0019 4 WFC3/IR MULTIAC IRSUB256 F125W 2 3 none none 1 N/A CUM LBQS-0302-0019 4 WFC3/IR MULTIAC IRSUB256 F125W 2 4 none none 1 N/A CUM LBQS-0302-0019 5 WFC3/IR MULTIAC IRSUB256 F125W 1 1 none none 1 N/A CUM LBQS-0302-0019 5 WFC3/IR MULTIAC IRSUB256 F125W 1 2 none none 1 N/A CUM LBQS-0302-0019 5 WFC3/IR MULTIAC IRSUB256 F125W 1 3 none none 1 N/A CUM LBQS-0302-0019 5 WFC3/IR MULTIAC IRSUB256 F125W 1 4 none none 1 N/A CUM LBQS-0302-0019 5 WFC3/IR MULTIAC IRSUB256 F125W 2 1 none none 1 N/A CUM LBQS-0302-0019 5 WFC3/IR MULTIAC IRSUB256 F125W 2 2 none none 1 N/A CUM LBQS-0302-0019 5 WFC3/IR MULTIAC IRSUB256 F125W 2 3 none none 1 N/A CUM LBQS-0302-0019 5 WFC3/IR MULTIAC IRSUB256 F125W 2 4 none none 1 N/A CUM LBQS-0302-0019 6 WFC3/IR MULTIAC IRSUB256 F125W 1 1 none none 2 N/A CUM LBQS-0302-0019 6 WFC3/IR MULTIAC IRSUB256 F125W 1 2 none none 2 N/A CUM LBQS-0302-0019 6 WFC3/IR MULTIAC IRSUB256 F125W 1 3 none none 2 N/A CUM LBQS-0302-0019 6 WFC3/IR MULTIAC IRSUB256 F125W 1 4 none none 3 N/A CUM LBQS-0302-0019 6 WFC3/IR MULTIAC IRSUB256 F125W 2 1 none none 3 N/A CUM 15480( 3) - 15-Aug-2018 13:43:15 - [ 8] 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 | ------------------------------------------------------------------------------------------------------------------------------------ LBQS-0302-0019 6 WFC3/IR MULTIAC IRSUB256 F125W 2 2 none none 3 N/A CUM LBQS-0302-0019 6 WFC3/IR MULTIAC IRSUB256 F125W 2 3 none none 4 N/A CUM LBQS-0302-0019 6 WFC3/IR MULTIAC IRSUB256 F125W 2 4 none none 4 N/A CUM LBQS-0302-0019 7 WFC3/IR MULTIAC IRSUB256 F125W 1 1 none none 2 N/A CUM LBQS-0302-0019 7 WFC3/IR MULTIAC IRSUB256 F125W 1 2 none none 2 N/A CUM LBQS-0302-0019 7 WFC3/IR MULTIAC IRSUB256 F125W 1 3 none none 2 N/A CUM LBQS-0302-0019 7 WFC3/IR MULTIAC IRSUB256 F125W 1 4 none none 3 N/A CUM LBQS-0302-0019 7 WFC3/IR MULTIAC IRSUB256 F125W 2 1 none none 3 N/A CUM LBQS-0302-0019 7 WFC3/IR MULTIAC IRSUB256 F125W 2 2 none none 3 N/A CUM LBQS-0302-0019 7 WFC3/IR MULTIAC IRSUB256 F125W 2 3 none none 4 N/A CUM LBQS-0302-0019 7 WFC3/IR MULTIAC IRSUB256 F125W 2 4 none none 4 N/A CUM LBQS-0302-0019 8 WFC3/IR MULTIAC IRSUB256 F125W 1 1 none none 2 N/A CUM LBQS-0302-0019 8 WFC3/IR MULTIAC IRSUB256 F125W 1 2 none none 2 N/A CUM LBQS-0302-0019 8 WFC3/IR MULTIAC IRSUB256 F125W 1 3 none none 2 N/A CUM LBQS-0302-0019 8 WFC3/IR MULTIAC IRSUB256 F125W 1 4 none none 3 N/A CUM LBQS-0302-0019 8 WFC3/IR MULTIAC IRSUB256 F125W 2 1 none none 3 N/A CUM LBQS-0302-0019 8 WFC3/IR MULTIAC IRSUB256 F125W 2 2 none none 4 N/A CUM LBQS-0302-0019 8 WFC3/IR MULTIAC IRSUB256 F125W 2 3 none none 4 N/A CUM LBQS-0302-0019 8 WFC3/IR MULTIAC IRSUB256 F125W 2 4 none none 4 N/A CUM LBQS-0302-0019 9 WFC3/IR MULTIAC IRSUB256 F125W 1 1 none none 2 N/A CUM LBQS-0302-0019 9 WFC3/IR MULTIAC IRSUB256 F125W 1 2 none none 2 N/A CUM LBQS-0302-0019 9 WFC3/IR MULTIAC IRSUB256 F125W 1 3 none none 3 N/A CUM LBQS-0302-0019 9 WFC3/IR MULTIAC IRSUB256 F125W 1 4 none none 3 N/A CUM LBQS-0302-0019 9 WFC3/IR MULTIAC IRSUB256 F125W 2 1 none none 3 N/A CUM 15480( 3) - 15-Aug-2018 13:43:15 - [ 9] 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 | ------------------------------------------------------------------------------------------------------------------------------------ LBQS-0302-0019 9 WFC3/IR MULTIAC IRSUB256 F125W 2 2 none none 4 N/A CUM LBQS-0302-0019 9 WFC3/IR MULTIAC IRSUB256 F125W 2 3 none none 4 N/A CUM LBQS-0302-0019 9 WFC3/IR MULTIAC IRSUB256 F125W 2 4 none none 4 N/A CUM LBQS-0302-0019 10 WFC3/IR MULTIAC IRSUB256 F125W none none none none 4 N/A CUM 15480( 3) - 15-Aug-2018 13:43:15 - [ 10] Summary Form for Proposal 15480 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IRSUB256 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=11, NSAMP=7, SAMP-SEQ=SPARS10, SAMP-SEQ=SPARS25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 2 1-5, PATTERN 2 6-9, SCHED 30% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F125W ------------------------------------------------------------------------------------------------------------------------------------ Target Names LBQS-0302-0019 ------------------------------------------------------------------------------------------------------------------------------------