9432( 5) - 03/19/03 08:29 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 9432 Version: 5 Check-in Date: 19-Mar-2003 08:28:33 1.Proposal Title: The Radio-Loud BAL QSO PKS 1004+13: A Key to Understanding QSO Outflows? ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 11 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Beverley Wills University of Texas at Austin CoI: Prof Ari Laor Technion - Israel Institute of Technology N CoI: Prof Niel Brandt Penn State University N ------------------------------------------------------------------------------------ 5. Abstract Accretion and outflows drive astrophysical engines on many scales. In powerful QSOs, broad absorption lines (BALs) reveal partially-ionized outflows to ~0.1c. What is the geometry of the flow, its origin, the driving mechanism? Why are the most extreme outflows always seen in radio-weak QSOs? Such basic questions remain unanswered. Plausibly, radiation pressure can drive an equatorial wind off the dusty torus or outer accretion disk. Are BAL QSOs seen nearly edge-on, as this scenario requires? We don't know because there is no good inclination indicator for these generally radio-weak QSOs. The bright, low-redshift QSO PKS 1004+13 may be a valuable exception. Its dominant radio lobes imply a near edge-on view, while low SNR IUE spectra suggest it is a BAL QSO. Indirect indications that it's a BAL QSO are: very weak soft X-ray flux, high scattering polarization, and unusually weak ionO3. It also shows clear high-ionization non-BAL absorption with partial continuum coverage. We propose high quality UV spectroscopy to confirm its BAL QSO identity. PKS 1004+13 would be only the second known BAL QSO with powerful radio jets, hence known inclination, providing a clear test of the outflow geometry, and the only such object at low redshift, allowing high SNR, high spatial resolution followup. ------------------------------------------------------------------------------------ 9432( 5) - 03/19/03 08:29 - [ 2] Observations Description ------------------------ We propose 1 orbit of STIS spectroscopy with the G230L grating and the 52X0.5 arcsec slit to search for the claimed CIV 1549 broad absorption trough at observed wavelengths 1840--1930\AA. It is important to have careful definition of the continuum to the short wavelength side of the trough (1730--1840\AA), and longward of the CIV 1549--HeII 1640-- [OIII] 1663 broad emission line complex (>2080\AA). For wavelengths < 2000\AA\ the Mama detector-plus-grating response is falling rapidly. In one orbit, 32 minutes of exposure time are available, with predicted S/N per resolution element of 20--40 of the region of most interest. The 2-pixel resolution is 3.2\AA, or 500 km/s in the region of most interest. At longer wavelengths the S/N rises to 50 near 2800\AA\ (rest wavelength 2258\AA), allowing excellent quality data over the important AlIII-- SiIII]--CIII]--FeIII emission line blend, and coverage of the FeII emission blends from 2200\AA\ to nearly 2600\AA. These features provide important information on optical depth and density of low-ionization gas in the broad line region. The longwavelength G230L coverage will also allow us to define the continuum in an attempt to further search for broad MgII 2798 BALs, using our existing ground-based spectroscopy to 3200\AA. Real Time Justification ----------------------- Calibration Justification ------------------------- We have no strict constraint, but note that we plan almost-simultaneous ground- based spectroscopy and spectropolarimetry, in the January--March time frame. This would improve our ability to combine the UV and optical spectra, for increased scientific value, as this quasar is a slow, low-amplitude variable. Additional Comments ------------------- ------------------------------------------------------------------------------------ 9432( 5) - 03/19/03 08:29 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PKS1004+13 GALAXY, QUASAR RA=10H 7M 26.1S +/- 0.2", J2000 Z = V = 15.2+/-0.2 DEC=12D 48' 56.0" +/- 0.2", 0.238 F-CONT(1920)=10+/-1e-15 PLATE-ID=028W Coordinate Source: GUIDE_STAR_CATALOG 9432( 5) - 03/19/03 08:29 - [ 4] Visit: 01 Visit Priority: Visit Requirements: BETWEEN 03-Mar-2003 AND 08-Mar-2003 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 ------------------------------------------------------------------------------------------------------------------------------------ 10 PKS1004+13 STIS/C ACQ F28X50L MIRROR 1 0.6 S CD P ------------------------------------------------------------------------------------------------------------------------------------ 20 PKS1004+13 STIS/N ACCUM 52X0.5 G230L 2376 1 2386 S UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 9432( 5) - 03/19/03 08:29 - [ 5] Visit: 11 Visit Priority: Visit Requirements: BETWEEN 31-Mar-2003 AND 07-Apr-2003 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 ------------------------------------------------------------------------------------------------------------------------------------ 10 PKS1004+13 STIS/C ACQ F28X50L MIRROR 1 0.6 S CD P ------------------------------------------------------------------------------------------------------------------------------------ 20 PKS1004+13 STIS/N ACCUM 52X0.5 G230L 2376 1 2386 S UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 9432( 5) - 03/19/03 08:29 - [ 6] Summary Form for Proposal 9432 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures F28X50LP 52X0.5 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 03-Mar-2003 AND 08-Mar-2003 BETWEEN 31-Mar-2003 AND 07-Apr-2003 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G230L ------------------------------------------------------------------------------------------------------------------------------------ Target Names PKS1004+13 ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 2376 ------------------------------------------------------------------------------------------------------------------------------------