Please find attatched our submission of programme 11012. This is a resubmission because of the ACS failure and the visit has been switched to WFPC2. We have currently placed all the observations (F300W, F450W and F606W) in a single 5 orbit visit. However these can be split up if it makes for easier scheduling. ----- Submission 1 (Wed Sep 27 10:36:23 GMT 2006) ----- ----- Attempting Submission 2 (Tue Mar 20 18:38:52 GMT 2007) ----- NGC 4190-ULX1: The forgotten ULX Although it ranks amongst the nearest (at d ~ 3 Mpc) and brightest (fx ~ 2e-12 erg/cm^2/s) ULXs, NGC 4190-ULX1 has not yet been observed in the modern era of X-ray astronomy. We propose to remedy this omission with three new observations designed to probe its underlying nature. Firstly, we will obtain a high precision X-ray position of the ULX using HRC-I. This will be used to identify an unique counterpart in new HST/ACS imaging, plausibly the first step towards deriving a dynamical mass function for this source. Finally, we will use an ACIS-S observation to derive the first high quality X-ray diagnostics (spectrum, light curve) of this ULX, with the aim of providing an interim assessment of the nature of the compact object underlying its extreme X-ray emission.
We request observations of NGC 4190 X1 with the aim of identifying the optical counterpart of this nearby ULX. Given the loss of ACS we will now conduct these observations with WFPC2 using the F300W, F450W and F606W filters. We will place the target at the WFALL aperture (i.e. at the corner of WF3) and conduct a standard 4 point dither pattern. 12 false 0.0 false false false false false false SUPPORTED UNIDENTIFIED ACCRETION DISK X-RAY EMITTER J2000 00 00 0.0000 +00 00 0.00 J2000 POS-TARG DITHER 0.559017 LINE 0.559017 false false 143.130096 4 26.56505 WFPC2-BOX 1 false /Users/andrewlevan/OP-cache/11012-noacs-v02.xml (Tic-Visit :proposal-id 11012 :visit-id "02" :proposal-version -1 :trans-version "20061210" :date "16-Mar-2007 15:01:41.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "26" :si-bright-earth-limb-angle 20.0 :data-volume 537792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11012 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11012 :visit-id "02" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2720 :al-overhead-at-end 160 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3159 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11012 :visit-id "02" :orbit-number 2 :pcs-time 355 :si-vis-utilization 2720 :al-overhead-at-end 160 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3159 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11012 :visit-id "02" :orbit-number 3 :pcs-time 355 :si-vis-utilization 2720 :al-overhead-at-end 160 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3159 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11012 :visit-id "02" :orbit-number 4 :pcs-time 355 :si-vis-utilization 2720 :al-overhead-at-end 160 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3159 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11012 :visit-id "02" :orbit-number 5 :pcs-time 355 :si-vis-utilization 2700 :al-overhead-at-end 180 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3159 :pcs-gap 0 ) true 5 0