9277( 2) - 08/07/01 15:24 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 9277 Version: 2 Check-in Date: 07-Aug-2001 15:24:13 1.Proposal Title: An Absorption Study of PG 2112+059: the X-Ray brightest BAL QSO Known ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 10 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Sarah Gallagher The Pennsylvania State University CoI: Niel Brandt Penn State N CoI: George Chartas Penn State N CoI: Ari Laor Technion N CoI: Jane Charlton Penn State N CoI: Beverley Wills University of Texas, Austin N ------------------------------------------------------------------------------------ 5. Abstract Broad Absorption Line (BAL) QSOs allow us to observe substantial gas outflows that are probably present in most QSOs, but the nature of their X-ray absorption remains poorly understood. In an ASCA/BeppoSAX survey of BAL QSOs, we have recently discovered that PG 2112+059 is the X-ray brightest BAL QSO known and shows X-ray absorption suggestive of ionized gas. Furthermore, X-ray spectral variability is apparent by comparison of ASCA and ROSAT data. We propose a 60 ks ACIS-S observation of PG 2112+059 that will provide the best constraints yet on the column density, ionization state, covering fraction, and outflow velocity of the X-ray gas in a BAL QSO. We will also obtain a simultaneous HST STIS spectrum to test UV/X-ray absorber models and monitor UV variability. ------------------------------------------------------------------------------------ 9277( 2) - 08/07/01 15:24 - [ 2] Observations Description ------------------------ Low resolution STIS spectra will be obtained of the redshift 0.457 BAL QSO, PG2112+059. This QSO was previously observed with FOS in 1992. The repeat observation with STIS will allow a comparison of the strength and velocity structure of the broad absorption lines in OVI, NV, SiIV, and CIV. Coverage of these transitions requires observations at S/N~30 in both the G140L and G230L gratings to meet the program goals. Exposure times of at least 840s with G140L and 1000s with G230L are needed. Real Time Justification ----------------------- Simultaneous GO3 time was awarded on Chandra. The Chandra observations have not been scheduled yet. Calibration Justification ------------------------- Additional Comments ------------------- To meet the science goals of our proposal, observations of HST and Chandra should be as close to simultaneous as possible, but in no case greater than 5 days apart. ------------------------------------------------------------------------------------ 9277( 2) - 08/07/01 15:24 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PG2112+059 GALAXY, QSO RA=21H 14M 52.58S +/- 1", J2000 V = 15.77+/-0.2 DEC=06D 7' 42.92" +/- 1", PLATE- ID=02V8 Coordinate Source: GSC_SURVEY_PLATE 9277( 2) - 08/07/01 15:24 - [ 4] Visit: 01 Visit Priority: 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 PG2112+059 STIS/C ACQ F28X50L MIRROR 1 5 S CD P ------------------------------------------------------------------------------------------------------------------------------------ 10 PG2112+059 STIS/N ACCUM 52X0.2 G230L 2376 1 900 S UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 20 PG2112+059 STIS/F ACCUM 52X0.2 G140L 1425 1 1100 S UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 9277( 2) - 08/07/01 15:24 - [ 5] Summary Form for Proposal 9277 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures F28X50LP 52X0.2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD STIS/NUV-MAMA STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G230L G140L ------------------------------------------------------------------------------------------------------------------------------------ Target Names PG2112+059 ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 2376 1425 ------------------------------------------------------------------------------------------------------------------------------------