0 Assigned ID: 67 ----- Attempting Submission 1 (Tue Apr 08 11:52:00 GMT 2014) ----- Please cc: co-I Lucas Macri (lmacri@tamu.edu) on all correspondence related to the Phase II. Thanks! -600179356 ----- Attempting Submission 1 (Mon Jul 07 19:07:37 GMT 2014) ----- A Cepheid-Based Distance to the Benchmark AGN NGC 4151 We propose to measure an accurate Cepheid-based distance to the archetypical Seyfert 1 galaxy NGC 4151, the brightest and arguably best-studied AGN in the sky. The current uncertainty in its distance is no less than 20% (the irreducible limit of the Tully-Fisher method, which in any case we argue systematically underestimates distances of AGNs), and consequently all luminosity and energetics measures are uncertain by more than 40%. The results of detailed studies of feedback, infall, and outflow and the interaction of gas, radiation, and winds in this galaxy have implications for our understanding of other galaxies because there are so few galaxies that can be observed in such great detail. Importantly, recent developments allow a direct high-precision comparison of black hole masses measured from gas and stellar dynamical modeling (distance dependent) and reverberation mapping (distance independent). With a precise distance measure, it is possible to address lingering doubts about the consistency of black hole mass measurement by these various methods. This program must be done at visible wavelengths and, on account of field crowding, can only be done with the high angular resolution obtainable with HST. We will image NGC 4151 on twelve epochs spanning 75 days using WFC3/UVIS and WFC3/IR. On each epoch, we will obtain 3x350s images with WFC3/UVIS and F350LP; these images will be used to search for Cepheid variables and determine their positions and periods. On 6 of the epochs we will obtain 2x553s images with WFC3/IR and F160W; these images will be used to establish the mean Cepheid magnitudes in the H band, which will serve as the primary measurement to determine the distance to the galaxy. On the other 6 epochs, we will obtain 2x550s images with WFC3/UVIS and F555W or F814W; these images will be used to establish the mean V-I color of each variable, required to correct for the effects of interstellar extinction. All exposure times listed above were entered to ensure schedulability in at least 90% of HST's orbits. We strongly prefer to obtain all images at two fixed position angles, one for each half of the observations (epochs 1-6 & 7-12, respectively). A single PA would be better, but it's not possible given HST's constraints on roll angle. The actual values of the PAs are left to the discretion of the program coordinator, although we note that a starting PA near 277 will provide optimal coverage of the star-forming regions within the galaxy. Previous observations of this galaxy with WFC3 at PA=282 would seem to suggest that our desired PA can be scheduled. The second PA should be chosen to be as similar as possible to the first one, within GS constraints; we've selected a value of 253 only to test schedulability of the visits. We strongly prefer to position WFC3/UVIS in such a way that the very bright AGN at the center of this galaxy falls within the chip gap, to avoid saturating as much as possible of the detector. AGN/QUASARS 0 false false 0.0 0.0 false false false SUPPORTED GALAXY SEYFERT SPIRAL This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 WFC3/UVIS Imaging No No F350LP WFC3/IR Imaging No No F160W WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F350LP WFC3/UVIS Imaging No No F814W POS-TARG DITHER 0.135 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 1 false POS-TARG DITHER 0.636 LINE false false 2 41.788 WFC3-IR-DITHER-LINE 2 false POS-TARG DITHER 0.145 LINE false false 2 46.84 WFC3-UVIS-DITHER-LINE 3 false Timing link suitability includes constraints ([02 After 01 by 7.4 to 8.4 days] [03 After 01 by 14.4 to 15.4 days] [04 After 01 by 21.0 to 22.0 days] [05 After 01 by 26.1 to 27.1 days] [06 After 01 by 29.7 to 30.7 days] [07 After 01 by 35.1 to 36.1 days] [08 After 01 by 42.5 to 43.5 days] [09 After 01 by 51.2 to 52.2 days] [10 After 01 by 59.5 to 60.5 days] [11 After 01 by 66.2 to 67.2 days] [12 After 01 by 73.0 to 75.0 days]) Hst Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13765 :visit-id "01" :proposal-version -1 :trans-version "20140605" :date "02-Jul-2014 14:50:50.0" :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 1318880 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13765 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13765 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2671 :al-overhead-at-end 0 :internal-dur-at-end 500 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([02 After 01 by 7.4 to 8.4 days]) Hst Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13765 :visit-id "02" :proposal-version -1 :trans-version "20140605" :date "02-Jul-2014 14:54:10.0" :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 13765 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13765 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2696 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([03 After 01 by 14.4 to 15.4 days]) Hst Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13765 :visit-id "03" :proposal-version -1 :trans-version "20140605" :date "02-Jul-2014 15:00:25.0" :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 13765 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13765 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2693 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([04 After 01 by 21.0 to 22.0 days]) Hst Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13765 :visit-id "04" :proposal-version -1 :trans-version "20140605" :date "02-Jul-2014 16:53:09.0" :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 1318880 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13765 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13765 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2671 :al-overhead-at-end 0 :internal-dur-at-end 500 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([05 After 01 by 26.1 to 27.1 days]) Hst Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13765 :visit-id "05" :proposal-version -1 :trans-version "20140605" :date "02-Jul-2014 14:57:14.0" :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 13765 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13765 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2696 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([06 After 01 by 29.7 to 30.7 days]) Hst Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13765 :visit-id "06" :proposal-version -1 :trans-version "20140605" :date "02-Jul-2014 15:00:26.0" :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 1318880 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13765 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13765 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2671 :al-overhead-at-end 0 :internal-dur-at-end 500 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([07 After 01 by 35.1 to 36.1 days]) Hst Same orient constraint links visits (07 08 09 10 11 12) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13765 :visit-id "07" :proposal-version -1 :trans-version "20140605" :date "02-Jul-2014 15:00:27.0" :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 13765 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13765 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2693 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([08 After 01 by 42.5 to 43.5 days]) Hst Same orient constraint links visits (07 08 09 10 11 12) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13765 :visit-id "08" :proposal-version -1 :trans-version "20140605" :date "02-Jul-2014 15:00:28.0" :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 1318880 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13765 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13765 :visit-id "08" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2671 :al-overhead-at-end 0 :internal-dur-at-end 500 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([09 After 01 by 51.2 to 52.2 days]) Hst Same orient constraint links visits (07 08 09 10 11 12) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13765 :visit-id "09" :proposal-version -1 :trans-version "20140605" :date "02-Jul-2014 15:00:29.0" :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 13765 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13765 :visit-id "09" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2696 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([10 After 01 by 59.5 to 60.5 days]) Hst Same orient constraint links visits (07 08 09 10 11 12) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13765 :visit-id "10" :proposal-version -1 :trans-version "20140605" :date "02-Jul-2014 16:53:11.0" :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 1318880 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13765 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13765 :visit-id "10" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2671 :al-overhead-at-end 0 :internal-dur-at-end 500 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([11 After 01 by 66.2 to 67.2 days]) Hst Same orient constraint links visits (07 08 09 10 11 12) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13765 :visit-id "11" :proposal-version -1 :trans-version "20140605" :date "02-Jul-2014 15:00:30.0" :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 13765 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13765 :visit-id "11" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2693 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([12 After 01 by 73.0 to 75.0 days]) Hst Same orient constraint links visits (07 08 09 10 11 12) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13765 :visit-id "12" :proposal-version -1 :trans-version "20140605" :date "02-Jul-2014 15:00:31.0" :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 1318880 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13765 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13765 :visit-id "12" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2671 :al-overhead-at-end 0 :internal-dur-at-end 500 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3030 :pcs-gap 0 ) true 1 0