12510( 2) - 11-Jul-2011 10:50:25 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12510 Version: 2 Check-in Time: 11-Jul-2011 10:50:25 STScI Edit Number: 0 Title Quasar Ton 34 with steepest far-UV break known has entered new bal QSO phase ------------------------------------------------------------------------------------ Type Cycle GO 19 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Luc Binette Universidad Nacional Autonoma de Mexico (UNAM) CoI: Dr. Luciana C. Bianchi The Johns Hopkins University N CoI: Dr. Yair Krongold Smithsonian Institution Astrophysical Y Observatory CoI: Dr. Elena Jimenez Bailon Universidad Nacional Autonoma de Mexico Y (UNAM) ------------------------------------------------------------------------------------ Abstract Using HST-COS/G140L and HST-STIS with G230L and G430L, we request 4 orbits to observe the QSO Ton34 (z=1.928). Among archive HST/FOS spectra, Ton34 shows an unusually steep FUV drop, equivalent to a powerlaw of index -5. At shorter wavelengths, only an extremely noisy IUE spectra exists. The FUV observations would provide us with a unique window to test whether Ton34 remains EUV deficient at shorter wavelengths or shows instead the onset of a second peak in the extreme (E)UV, explaining how photoionization can still account for its high excitation emission lines of CIV, OVI With the STIS MAMA-NUV spectrum, we will also study and confirm whether low excitation EUV BLR lines such as the permitted lines of OII + OIII (835) or NIII (686) are present and as strong as reported from an earlier but noisy IUE spectrum (this would possibly favor shock excitation). Using archive optical spectra near the CIV region (from years 1988 and 2006), we recently showed that Ton34 is currently undergoing a strong BalQSO phase, the first case reported among bright quasars. A priority of the proposed STIS NUV observations will be to look for the presence of blueshifted absorption troughs near Ly-alpha or OIV (as well as any change in the continuum's sharp break) using the STIS/G430L spectrum. ------------------------------------------------------------------------------------ Observations Description ------------------------ Using earlier IUE (SWP+LWP) as well as FOS and 5m Palomar observations of TON34, we derived a SED for its continuum, which is used in ETC to determine integration times and properly evaluate (and rule out) possible risks for MAMA & COS. The strong emission line fluxes are manually added in the ETC form. The absolute flux calibration is provided by the FOS spectrum Y2IE0A04T obtained with grating G270H. http://archive.stsci.edu/cgi-bin/mastpreview?mission=hst&dataid=Y2IE0A04T We requested 4 orbits in total: -2 orbits with COS and grating G140L, -1 orbit with STIS MAMA NUV grating G230L, -1 orbit with STIS CCD grating G430L. The 3 visits are described as follows: 12510( 2) - 11-Jul-2011 10:50:25 - [ 2] --The two COS orbits will provide a S/Nresel >5 in the interval 1100 to 1500A. All four FP-POS will be covered. ACQ/SEARCH and ACQ/IMAGE will be used as it is a more efficient set-up. The resulting FUV spectrum will be used to check whether there is any flux recovery shortward of 1600A obsframe (600A restframe) and also to confirm the presence of (unusually) low excitation BLR lines (OIII, NIII...). --G230L: quasar TON34 is unusually EUV deprived, showing a sharp decline in flux shortward of 1000A restframe (~2900A obsframe). The STIS-MAMA-G230L integration will be used to characterize this flux decline down to the NUV wavelengths covered by COS-G130L. The expected S/Nresel is ~10 at 2400A. We expect to confirm the presence of other low excitation BLR lines in that range as well. The narrow longslit 52x0.1 will be used. G430L: using a SDSS spectrum that covered the CIV line, the quasar TON34 was shown to be the first bright quasar known to have becomed a BALQSO. In order to study the Ly-alpha region down to OIV, a NUV spectrum will be obtained with STIS-CCD-G430L. To manage CR, four integrations will be performed. The narrow longslit 52x0.1E1 will be used. A global S/Nresel of ~30 will be attained at 3200A after combining the 4 exposures. Real Time Justification ----------------------- No real-time or special scheduling requirements. Calibration Justification ------------------------- No special calibrations required. Additional Comments ------------------- There are no objects brighter than V=21 within a radius of 1.1arcmin of TON34. Using the BOT tool in APT, the GALEX test reports no stars in the vicinity of target while the GSC2 test shows green status for the MAMA slit exposure and the COS exposure with grating. A red safety status of level 1 appears only for the COS exposures using ACQ and ACQ/IMAGE of the target (because V=15.80 and the count rate would be 11, 170cnt/s if it was an OV star, but IT IS NOT an OV star). Using ETC and the known UV SED of target, we find with ETC that the expected count rate (15cnts/s) ismuch lower than the maximum recommended of 50cnts/s) ------------------------------------------------------------------------------------ 12510( 2) - 11-Jul-2011 10:50:25 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 QSO-J1019+27 GALAXY, BLR, NLR, QSO RA=10H19M56.5980S +/- 0.2", J2000 Z = V = 15.80 1.4E-15 erg/s/cm2/Ang at 45 DEC=+27D44'1.76" +/- 0.2" 1.928 1100A.; 0.1E-15 at 1750A; 0.3E-15 erg/s/cm2/Ang at 2300A; 0.66e-15 erg/s/cm2/Ang at 2600A; 1.2E-15 erg/s/cm2/Ang at 3200A; 1.0e-15 erg/s/cm2/Ang at 3800A Reference Frame: ICRS Comments: Position derived from 6th release of SDSS. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 12510( 2) - 11-Jul-2011 10:50:25 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type STIS-ALONG-SLIT Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.35 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 90.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type STIS-ALONG-SLIT Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.55 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 90.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12510( 2) - 11-Jul-2011 10:50:25 - [ 5] Visit: 01 Visit Requirements: 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 QSO-J1019+2 COS/NUV ACQ/SEA PSA MIRRORA CENTER=FLUX-WT, SCAN-SIZE=2, 1 14.6 S 745 RCH STEP-SIZE=1.767 Comments: MIRROR A; NUV limits Brightest pixel has 15.2cnts/s (limit of 50cnts/s for irregular objects). The total count rate in selected region is 109cnts/s (limit is 68000/s for irregular objects) ------------------------------------------------------------------------------------------------------------------------------------ 2 QSO-J1019+2 COS/NUV ACQ/IMA PSA MIRRORA 1 14.6 S 745 GE Comments: With MIRROR A; NUV limits as follows: Brightest pixel has 15.2cnts/s (recommended limit is 50cnts/s for irregular objects). The total count rate in selected region is 109cnts/s (recommended limit is 68000/s for irregular objects) ------------------------------------------------------------------------------------------------------------------------------------ 3 QSO-J1019+2 COS/FUV TIME-TA PSA G140L 1280 FP-POS=1, BUFFER-TIME=750, 1 1083 S 745 G FLASH=YES, EXTENDED=NO, SEGMENT=BOTH Comments: Count rate Segment A : 63 Count rate Segment B : 44 S/N=5.8 at 1150A buffer-time set at 2/3 of integration time ------------------------------------------------------------------------------------------------------------------------------------ 4 QSO-J1019+2 COS/FUV TIME-TA PSA G140L 1280 FP-POS=2, BUFFER-TIME=750, 1 1083 S 745 G FLASH=YES, EXTENDED=NO, SEGMENT=BOTH Comments: Count rate Segment A : 63 Count rate Segment B : 44 S/N=5.8 at 1150A buffer-time set at 2/3 of integration time ------------------------------------------------------------------------------------------------------------------------------------ 5 QSO-J1019+2 COS/FUV TIME-TA PSA G140L 1280 FP-POS=3, BUFFER-TIME=950, 1 1412 S 745 G FLASH=YES, EXTENDED=NO, SEGMENT=BOTH Comments: Count rate Segment A : 63 Count rate Segment B : 44 S/N=6.6 at 1150A buffer-time set at 2/3 of integration time ------------------------------------------------------------------------------------------------------------------------------------ 12510( 2) - 11-Jul-2011 10:50:25 - [ 6] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 6 QSO-J1019+2 COS/FUV TIME-TA PSA G140L 1280 FP-POS=4, BUFFER-TIME=950, 1 1412 S 745 G FLASH=YES, EXTENDED=NO, SEGMENT=BOTH Comments: Count rate Segment A : 63 Count rate Segment B : 44 S/N=6.6 at 1150A buffer-time set at 2/3 of integration time ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ QSO-J1019+2745 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH QSO-J1019+2745 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE QSO-J1019+2745 3 COS/FUV TIME-TA PSA G140L 1280 none none none none 1 N/A G QSO-J1019+2745 4 COS/FUV TIME-TA PSA G140L 1280 none none none none 1 N/A G QSO-J1019+2745 5 COS/FUV TIME-TA PSA G140L 1280 none none none none 2 N/A G QSO-J1019+2745 6 COS/FUV TIME-TA PSA G140L 1280 none none none none 2 N/A G 12510( 2) - 11-Jul-2011 10:50:25 - [ 7] Visit: 02 Visit Requirements: 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 QSO-J1019+2 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 2.9 S 745 Comments: ACQ with a S/N=50 is achieved with an integration time of 2.9s with an APERTURE=F28X50LP. Total counts in selected region = 2986 cnts. TheTime to Saturation (for a single exposure) = 360.24 seconds ------------------------------------------------------------------------------------------------------------------------------------ 2 QSO-J1019+2 STIS/CCD ACQ/PEA 52X0.1 MIRROR 1 6.5 S 745 K Comments: MIRROR mode on 52x0.1 slit; Integration time of 6.5s, gives SNR = 70 AND a Time to Saturation (for a single exposure) = 180 second; Total count in selected region of 21, 286 cnts ------------------------------------------------------------------------------------------------------------------------------------ 3 QSO-J1019+2 STIS/NUV ACCUM 52X0.1 G230L 2376 1 474 S PATTERN 2 3 745 -MAMA Comments: Using the BOT tool in APT, the GALEX test reports no stars in the vicinity of target while the GSC2 test shows green status for this MAMA exposure. S/Nresel=6.0 at 2500A expected on each of the 4 dithered exposure on MAMA. Count rate entire detector = 3, 723.739cnts. Background (sky+dark) = 3, 670nts/s BUFFER_TIME should be 2e6/3723=537s; but 300 would be better in case source varied max integration time is 16, 116s ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ QSO-J1019+2745 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A QSO-J1019+2745 2 STIS/CCD ACQ/PEA 52X0.1 MIRROR none none none none 1 N/A K QSO-J1019+2745 3 STIS/NUV ACCUM 52X0.1 G230L 2376 1 none none none 1 N/A -MAMA 12510( 2) - 11-Jul-2011 10:50:25 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ QSO-J1019+2745 3 STIS/NUV ACCUM 52X0.1 G230L 2376 2 none none none 1 N/A -MAMA QSO-J1019+2745 3 STIS/NUV ACCUM 52X0.1 G230L 2376 3 none none none 1 N/A -MAMA QSO-J1019+2745 3 STIS/NUV ACCUM 52X0.1 G230L 2376 4 none none none 1 N/A -MAMA 12510( 2) - 11-Jul-2011 10:50:25 - [ 9] Visit: 03 Visit Requirements: 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 QSO-J1019+2 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 2.9 S 745 Comments: ACQ with a S/N=50 is achieved with an integration time of 2.9s with an APERTURE=F28X50LP. Total counts in selected region = 2986 cnts. TheTime to Saturation (for a single exposure) = 360.24 seconds ------------------------------------------------------------------------------------------------------------------------------------ 2 QSO-J1019+2 STIS/CCD ACQ/PEA 52X0.1E1 MIRROR 1 1.6 S 745 K Comments: MIRROR mode on 52x0.1 slit; Integration time of 6.5s, gives SNR = 70 AND a Time to Saturation (for a single exposure) = 180 second; Total count in selected region of 21, 286 cnts ------------------------------------------------------------------------------------------------------------------------------------ 3 QSO-J1019+2 STIS/CCD ACCUM 52X0.1E1 G430L 4300 CR-SPLIT=NO, GAIN=1 1 498 S PATTERN 1 3 745 Comments: To manage CR and hot pixels, dithering is performed over 4 positions along the slit. A S/Nresel of 15 is expected at 3200A for each exposure dithered. The narrow longslit 52x0.1E1 is used. The Total count in selected region is 608.72cnt/2pix_resel AND the Time to Saturation (for a single exposure) = 30, 122 seconds, justifying GAIN=1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ QSO-J1019+2745 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A QSO-J1019+2745 2 STIS/CCD ACQ/PEA 52X0.1E1 MIRROR none none none none 1 N/A K QSO-J1019+2745 3 STIS/CCD ACCUM 52X0.1E1 G430L 4300 1 none none none 1 N/A QSO-J1019+2745 3 STIS/CCD ACCUM 52X0.1E1 G430L 4300 2 none none none 1 N/A QSO-J1019+2745 3 STIS/CCD ACCUM 52X0.1E1 G430L 4300 3 none none none 1 N/A QSO-J1019+2745 3 STIS/CCD ACCUM 52X0.1E1 G430L 4300 4 none none none 1 N/A 12510( 2) - 11-Jul-2011 10:50:25 - [ 10] Summary Form for Proposal 12510 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.1, 52X0.1E1, F28X50LP, PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV, STIS/CCD, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/IMAGE, ACQ/PEAK, ACQ/SEARCH, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=POINT, BUFFER-TIME=750, BUFFER-TIME=950, CENTER=FLUX-WT, CR-SPLIT=NO, EXTENDED=NO, FLASH=YES, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, GAIN=1, SCAN-SIZE=2, SEGMENT=BOTH, STEP-SIZE=1.767 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 3, PATTERN 2 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, G230L, G430L, MIRROR, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names QSO-J1019+2745 ------------------------------------------------------------------------------------------------------------------------------------