14477( 4) - 14-Mar-2016 18:54:59 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14477 Version: 4 Check-in Time: 14-Mar-2016 18:54:59 STScI Edit Number: 1 Title UV to hard X-ray spectroscopy of the prototype disk wind quasar, PDS 456 ------------------------------------------------------------------------------------ Type Cycle GO 24 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. James Reeves University of Maryland Baltimore County Y CoI: Dr. Valentina Braito INAF, Osservatorio Astronomico di Brera, N Merate CoI: Dr. Emanuele Nardini University of Keele Y CoI: Dr. Paul T. O'Brien University of Leicester Y ------------------------------------------------------------------------------------ Abstract PDS 456, the most luminous nearby AGN, is now recognised as the prototype ultra fast outflow. Our recent XMM-Newton and NuSTAR campaign on PDS 456 established the presence of a fast (0.3c), wide angle disk wind, sufficient to provide significant mechanical feedback into its host galaxy. The new RGS data have revealed the presence of variable, broad soft X-ray absorption lines from the disk wind, which may be associated to the partial covering absorber. Here we propose for 2x80 ks XMM-Newton observations of PDS 456 and a two orbit HST/COS snapshot which will simultaneously measure the wind in the UV and X-rays. The requested observations will be concurrent with a likely Astro-H observation during 2016. For the first time we will obtain high resolution coverage of the wind from the UV to hard X-rays. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose a HST/COS observation of PDS~456 using the G140L grating which give a suitable velocity resolution over the required wavelength range from blueward of Ly$\alpha$ to redward of HeII $\lambda 1640$. We adopt the previous HST/STIS spectrum as a guide to the target flux, and assume no major UV continuum variability. Comparing the HST/STIS observed flux with the XMM-Newton OM UV magnitudes provides fluxes consistent to well within a factor of two. Simulations show that we can measure the required spectral features with sufficient accuracy to achieve the science goals of our proposal by attaining a signal-to-noise ratio of 20-30 per HST/COS spectral resolution element. We require this S/N particularly at the location of the broad absorption feature (observed wavelength $\approx 1350$\AA) and the NV and CIV emission lines (observed wavelengths $\approx 1450$ \AA\ and 1800\AA). We have used the on-line HST exposure-time calculators to determine and compare the required exposure times. To cover the spectral range required, we request observations using the G140L grating for 95 minutes. The previous HST/STIS observation shows that the host-galaxy of PDS~456 does not contaminate the UV spectrum significantly. Given the declination of PDS~456, we have 54 minutes per orbit of visibility. 14477( 4) - 14-Mar-2016 18:54:59 - [ 2] The HST observations are to be coordinated with an XMM-Newton observation as part of this joint XMM-Newton/HST program, ------------------------------------------------------------------------------------ 14477( 4) - 14-Mar-2016 18:54:59 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PDS456 GALAXY, QSO RA=17H28M19.8000S +/- 0.4", J2000 V = 14.03 The observed continuum flux DEC=-14D15'55.90" +/- 0.4" at 1350 Angstrom is 4e-15 Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 14477( 4) - 14-Mar-2016 18:54:59 - [ 4] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: COS observation of PDS 456. 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 PDS456 COS/FUV ACQ/SEA PSA G140L 1280 SCAN-SIZE=2 1 25 S (25 RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 PDS456 COS/FUV ACQ/PEA PSA G140L 1280 1 25 S (25 KXD S) ------------------------------------------------------------------------------------------------------------------------------------ 3 PDS456 COS/FUV ACQ/PEA PSA G140L 1280 NUM-POS=5, STEP-SIZE=0.9, 1 25 S (25 KD CENTER=FLUX-WT-FLR S) ------------------------------------------------------------------------------------------------------------------------------------ 4 PDS456 COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1500, FP-POS=ALL 1 1000 S G see below (4642 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ PDS456 1 COS/FUV ACQ/SEA PSA G140L 1280 none none none none 1 N/A RCH PDS456 2 COS/FUV ACQ/PEA PSA G140L 1280 none none none none 1 N/A KXD PDS456 3 COS/FUV ACQ/PEA PSA G140L 1280 none none none none 1 N/A KD PDS456 4 COS/FUV TIME-TA PSA G140L 1280 none none none 1 1 946.0 S G PDS456 4 COS/FUV TIME-TA PSA G140L 1280 none none none 2 1 946.0 S G PDS456 4 COS/FUV TIME-TA PSA G140L 1280 none none none 3 2 1375.0 S G PDS456 4 COS/FUV TIME-TA PSA G140L 1280 none none none 4 2 1375.0 S G 14477( 4) - 14-Mar-2016 18:54:59 - [ 5] Summary Form for Proposal 14477 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAKD, ACQ/PEAKXD, ACQ/SEARCH, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1500, CENTER=FLUX-WT-FLR, FP-POS=ALL, NUM-POS=5, SCAN-SIZE=2, STEP-SIZE=0.9 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L ------------------------------------------------------------------------------------------------------------------------------------ Target Names PDS456 ------------------------------------------------------------------------------------------------------------------------------------