Unveiling the Quiescent Accretion State of AGN with Fading Changing-Look Quasars

Science Keywords: Select from 2 to 5 items. Science Keywords is a required field. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. 0 Assigned ID: 1054 ----- Attempting Submission 1 (Fri Aug 09 11:40:48 GMT 2019) ----- HST Phase I Proposal 1054 (Ruan.apt) successfully submitted. Receipt: # 1054-1 Joint Chandra/HST This Phase II resubmission is to add Visit 54, which is a re-observation of Visit 04 that failed. -1928390832 ----- Attempting Submission 1 (Fri Sep 20 03:05:03 GMT 2019) ----- ----- Attempting Submission 2 (Fri Oct 11 03:51:06 GMT 2019) ----- HST Phase II Proposal 15988 (Untitled.apt) successfully submitted. Receipt: # 15988-2 ----- Attempting Submission 3 (Thu Oct 17 17:31:52 GMT 2019) ----- ----- Attempting Submission 4 (Wed Dec 18 22:40:56 GMT 2019) ----- The visit planner was previously run for Visit 04, and the new Visit 54 in this resubmission is the same. Unveiling the Quiescent Accretion State of AGN with Fading Changing-Look Quasars We propose for joint Chandra X-ray and HST UV imaging of three fading changing-look quasars, which have each faded to Eddington ratios of ~10^-3.5 over the past ~10 years. We aim to follow their UV-to-X-ray spectral evolution (through alpha_ox) as they transition into a quiescent accretion state that is expected below Eddington ratios of <10^-4. These are the first observations that can directly follow individual AGN to quiescence, and enables a new test of the AGN/X-ray binary analogy. We will use WFC3 UVIS with the F300X filter to image 4 targets (1 orbit each): 3 changing-look quasars, and 1 PSF star (V ~ 12 mag). The WFC3 total exposure times for our 3 changing-look quasar targets range between 30 to 42 min, which will be broken up into 5 exposures for each target. We can comfortably fit these observations (including all necessary overheads) into 1 HST orbit for each target, since the HST orbital visibility for our targets are in the range of 54 to 58 min. As an example, the orbit for J0126-0839 can be as follows: 6 min for initial target acquisition, 6 min first exposure, 2.6 min for read-out, 0.5 min for dithering, 6 min second exposure, 2.1 min for read-out, 0.5 min for dithering, 6 min third exposure, 2.1 min for read-out, 0.5 min for dithering, 6 min fourth exposure, 2.1 min for read-out, 0.5 min for dithering, 6 min fifth exposure. This totals 46.9 min (30 min total exposure time + 16.9 min total overhead), and the exposures can be prolonged to fill the 54 min visibility of this object in a single orbit. For all of our targets, the individual exposures are sufficiently long that buffer dumps can be performed in parallel. In addition to the 1 HST orbit each for our 3 changing-look quasar targets, we also request a fourth orbit to observe one bright PSF star (P330E/GSC02581-02323) at the same dither positions and through the same filter. These PSF star images are important to aid in spatially decomposing the nuclear AGN point source from the host galaxy. Please note that the Phase 2 of this program was re-submitted to change the PSFSTAR target to GSC02581-02323, which has previously been observed in the F300X filter and thus our exposure times are safe from saturation. None Required. Massive Black Holes And Their Host Galaxies 6 false false false false false false false SUPPORTED GALAXY QUASAR SEYFERT This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY QUASAR SEYFERT This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY QUASAR SEYFERT This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 STAR G III-I NO This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 WFC3/UVIS Imaging No No F300X WFC3/UVIS Imaging No No F300X WFC3/UVIS Imaging No No F300X WFC3/UVIS Imaging No No F300X POS-TARG DITHER 0.145 Each of the 4 targets (J0126-0839, J1011+5442, J2336+0017, PSFSTAR) will have 1 orbit. In each orbit, there are 5 exposures all in the F300X filter, and thus we request the same WFC3-UVIS-DITHER-LINE dither pattern with 5 points for each orbit. No mosaic-ing is necessary for the science goals. For the 3 quasar targets, all the exposure time are sufficiently long that buffer dumps can be performed in parallel. For the PSFSTAR target, buffer dumps will be performed after the first, second, third, and fourth exposures. LINE false false 5 46.84 WFC3-UVIS-DITHER-LINE 1

false

1571332466547 The scheduling data was generated by CASM 27.2. CASM was run in Phase II mode. 1 orbit for quasar J0126-0939, using Pattern1 (Tic-Visit :proposal-id 15988 :visit-id "01" :proposal-version -1 :trans-version "20190514" :date "17-Oct-2019 13:14:26.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15988 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15988 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2588 :al-overhead-at-end 123 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2922 :pcs-gap 0 ) true 1 0 We place the targets on the optimum center of WFC3 UVIS detector chip 2 since it is more UV-sensistive. 1571332467512 The scheduling data was generated by CASM 27.2. CASM was run in Phase II mode. 1 orbit for quasar J1011+5442, using Pattern1 (Tic-Visit :proposal-id 15988 :visit-id "02" :proposal-version -1 :trans-version "20190514" :date "17-Oct-2019 13:14:27.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15988 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15988 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2998 :al-overhead-at-end 123 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) true 1 0 We place the targets on the optimum center of WFC3 UVIS detector chip 2 since it is more UV-sensistive. 1571332468275 The scheduling data was generated by CASM 27.2. CASM was run in Phase II mode. 1 orbit for quasar J2336+0017, using Pattern1 1575277967000 67.38133756066509 (Tic-Visit :proposal-id 15988 :visit-id "03" :proposal-version -1 :trans-version "20190514" :date "17-Oct-2019 13:14:28.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15988 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15988 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2808 :al-overhead-at-end 123 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 1 0 We place the targets on the optimum center of WFC3 UVIS detector chip 2 since it is more UV-sensistive. 1571332468964 The scheduling data was generated by CASM 27.2. CASM was run in Phase II mode. 1 orbit for PSF star GSC02581-02323, using pattern 1 1576448601000 343.31341452362153 (Tic-Visit :proposal-id 15988 :visit-id "04" :proposal-version -1 :trans-version "20190514" :date "17-Oct-2019 13:14:28.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443728 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15988 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15988 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2050 :al-overhead-at-end 125 :internal-dur-at-end 352 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) true 1 0 1576706030864 /Users/johnruan/Dropbox/proposals/ChandraHST_2019_CLQ/APT_V3/OP-cache/Untitled-v54.xml The scheduling data was generated by CASM 27.2. CASM was run in Phase II mode. Re-visit of Visit 04, which failed. (Tic-Visit :proposal-id 15988 :visit-id "54" :proposal-version -1 :trans-version "20190514" :date "18-Dec-2019 16:53:50.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443728 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15988 :visit-id "54" :obset-id "54" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15988 :visit-id "54" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2050 :al-overhead-at-end 125 :internal-dur-at-end 352 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180 :pcs-gap 0 ) true 1 0