6600( 3) - 02/12/96 10:38 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6600 Version: 3 Check-in Date: 12-Feb-1996 10:29:14 1.Proposal Title: Investigating high-temperature big bumps in AGN ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle AGN GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Elizabeth M. Puchnarewicz Mullard Space Science Laboratory CoI: Dr. Aneta Siemiginowska Harvard-Smithsonian Center for N Astrophysics CoI: Professor Keith O. Mason Mullard Space Science Laboratory N ------------------------------------------------------------------------------------ 6. Abstract We propose HST-FOS observations of an AGN which has one of the hottest optical to soft X-ray `big bumps' identified to date. QSO1034+3938 is a narrow-line Seyfert 1 galaxy (z=0.042) which shows no trace of the big blue bump in the optical and a high energy turnover of the big bump in soft X-rays; these properties are both highly unusual. The existence of such high-temperature components stretches models of the optical to X-ray big bump to unprecedented limits. HST-FOS spectra of this AGN will provide key observational tests for these models as well as diagnostics of the effect of the big bump on UV line emission in the high- temperature extreme. We plan to investigate the UV spectrum of QSO1034+3938 and: (1) characterize the continuum shape; (2) measure UV line FWHM and fluxes; and (3) search for the low energy tail of the big bump and investigate a possible optical/UV power-law component in QSO1034+3938. ------------------------------------------------------------------------------------ 6600( 3) - 02/12/96 10:38 - [ 2] Observations Description ------------------------ We request an observation with the G130H+Blue Digicon to extend as far into the UV as possible to search for the big bump, and to measure Lyalpha (which will be shifted sufficiently from the geocoronal Lyalpha line). In addition, we wish to measure CIV1549 with the G190H+Blue Digicon (CIII]1909 also falls within this range) and MgII2798 with the G270H+Blue Digicon. Since the Hbeta FWHM is quite narrow (~1500 km s-1), and since this may be a physical consequence of the unusual continuum spectrum, we anticipate that the UV line FWHM may also be small. The ability to resolve the FWHM of Lyalpha and CIV is essential if we are to establish whether the high-ionization UV lines follow the same trend as the low-ionization Balmer lines, thus we require the high resolution gratings. We also require a PRISM+Blue Digicon exposure to make any renormalizations due to variability. Requested exposure times are also given in Table 1 for a S/N=10 per diode in the continuum (assuming that there is no big bump emission, in which case it would be higher), and at least this in Lyalpha, CIV and CIII]. These times have been calculated using the inverse sensitivities and other information in Version 6.0 of the FOS Instrument Handbook. Count rates were calculated assuming mV=15.6 and alpha=1.4. These observations will require 4HST orbits (one primarily for target acquisition and three for obtaining science data). The amount of absorption along the line of sight to QSO1034+3938 is small both within our Galaxy and locally to the AGN (NH=1.2e20 cm-2), therefore we expect any reddening in the spectra to be minimal. Although the galaxy component in QSO1034+3938 (z=0.04) is strong, its contribution will be negligible in the short wavelength regions we propose, therefore the 1.0 arcsecond circular aperture is appropriate in this case. We request the ACQ/PEAK mode for target acquisition with a pointing accuracy >0.1 arcsec. Although QSO1034+3938 lies at low redshift (z=0.04), the host galaxy emission is negligible in the 2000-5000A region and will be dominated by the unresolved nuclear source. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6600( 3) - 02/12/96 10:38 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 ZW212.025 GALAXY,SEYFERT,ACCRETIO RA=10H 34M 38.63S +/-0.1S, J2000 Z=0.042 V = 15.6+/-0.5 N DISK,BLR DEC=39D 38' 28.36" +/-0.1", B-V = 0.6+/-0.3 PLATE-ID=000B F-CONT(1300)=2+/-1e-15 F-CONT(1600)=2+/-1e-15 6600( 3) - 02/12/96 10:38 - [ 4] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ZW212.025 FOS/BL ACQ/PEA 4.3 MIRROR SCAN-STEP- 1 2S ONBOARD ACQ FOR 2 K Y=1.23,SEARCH- SIZE-Y=3,SEARCH -SIZE-X=1 Comments: Stage 1 of 3 stage peakup with a pointing accuracy >0.1 arcsec ------------------------------------------------------------------------------------------------------------------------------------ 2 ZW212.025 FOS/BL ACQ/PEA 1.0 MIRROR SCAN-STEP- 1 2S ONBOARD ACQ FOR 3 K X=0.61,SCAN- STEP- Y=0.61,SEARCH- SIZE-X=6,SEARCH Comments: Stage 2 of 3 stage peakup -SIZE-Y=2 ------------------------------------------------------------------------------------------------------------------------------------ 3 ZW212.025 FOS/BL ACQ/PEA 0.5 MIRROR SCAN-STEP- 1 2S ONBOARD ACQ FOR 4-8 K X=0.29,SCAN- STEP- Y=0.29,SEARCH- SIZE-X=3,SEARCH Comments: Stage 3 of 3 stage peakup -SIZE-Y=3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ZW212.025 FOS/BL ACCUM 1.0 G270H 1 12M NO SPLIT MAX DUR 120% ------------------------------------------------------------------------------------------------------------------------------------ 5 ZW212.025 FOS/BL ACCUM 1.0 G190H 1 41M ------------------------------------------------------------------------------------------------------------------------------------ 6 ZW212.025 FOS/BL ACCUM 1.0 G130H 1 41M ------------------------------------------------------------------------------------------------------------------------------------ 7 ZW212.025 FOS/BL ACCUM 1.0 G130H 1 25M EXPAND ------------------------------------------------------------------------------------------------------------------------------------ 8 ZW212.025 FOS/BL ACCUM 1.0 PRISM 1 5M NO SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 6600( 3) - 02/12/96 10:38 - [ 5] Summary Form for Proposal 6600 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/BL ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SCAN-STEP-Y=1.23 SEARCH-SIZE-Y=3 SEARCH-SIZE-X=1 SEARCH-SIZE-Y=2 SEARCH-SIZE-X=3 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category AGN ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 2 ONBOARD ACQ FOR 3 ONBOARD ACQ FOR 4-8 NO SPLIT MAX DUR 120% EXPAND NO SPLIT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G270H G190H G130H PRISM ------------------------------------------------------------------------------------------------------------------------------------ Target Names ZW212.025 ------------------------------------------------------------------------------------------------------------------------------------