5951( 9) - 10/11/95 09:04 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5951 Version: 9 Check-in Date: ********** 1.Proposal Title: Ly Alpha forest, abundances, and cloud properties in the two lines of sight of the bright double QSO HE 1104-1805 ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Quasars GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Prof. D. Reimers Hamburger Sternwarte, University of Hamburg CoI: Dr. S. Vogel Hamburger Sternwarte, University of N Hamburg CoI: Dr. L. Wisotzki Hamburger Sternwarte, University of N Hamburg CoI: Dr. H.-J. Hagen Hamburger Sternwarte, University of N Hamburg CoI: Dr. A. Smette University of Groningen N CoI: Dr. P. Rodriguez-Pascual ESA IUE Observatory N ------------------------------------------------------------------------------------ 6. Abstract We propose to observe both components of the bright double QSO HE 1104-1805 (z=2.303, d=3 arcsec) with the FOS at high S/N in the wavelength range from 2430 to 3270 Angstrom with the aim to measure for the first time both number densities and lateral dimensions of Ly Alpha forest clouds in the yet unexplored range 1<=z<=1.6 for which this QSO is a unique target. A further aim is to measure CNO abundances and ionization conditions (radiative or collisional?) in several high- ionization absorption line systems in two different lines of sight of each cloud. In addition, the z=1.66 damped Ly Alpha system in component A (not damped in B) offers the possibility to resolve geometrically an early galaxy by two different lines of sight: one passing through disk plus Halo (A) the other only through Halo (B). UV spectra are necessary for this part in order to observe a wide range of ionization stages (NIII, OVI, SiIII, CIII, SIII, IV, VI in addition to optical data) with the aim to obtain Halo and disk abundances. A further aim is to extend our knowledge of the chromatic effect of the probably microlensed component in A to rest wavelengths Lambda > 740 Angstrom. ------------------------------------------------------------------------------------ 5951( 9) - 10/11/95 09:04 - [ 2] Observations Description ------------------------ High resolution spectra of both components are taken with the FOS G270H. With a flux of 2 E-15 erg/(cm*cm)/s/Angstroem between 2440 and 3200 Angstroem (Reimers et al. 1994), a S/N >= 30 is reached in 21 minutes. for component A (1 orbit). Component B is approximately a factor of 5 fainter which requires 105 minutes exposure time or 3 orbits. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5951( 9) - 10/11/95 09:04 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HE-1104- GALAXY,QSO RA=11H 6M 33.45S +/- 0.04S, DEC J2000 Z=2.303 B=16.7 1805A = -18D 21' 24.2" +/- 0.5",PLATE- F(2800) = 1.8 +/- 0.1 E-15 ID=04O5 2 HE-1104- GALAXY,QSO RA=11H 6M 33.64S +/- 0.04S, DEC= J2000 Z=2.303 B=18.64 1805B -18D 21' 25.6" +/- 0.5", PLATE- F(2800) = 3 +/- 1 E-16 ID=04O5 Comments: Flux value derived from optical ratio to brighter component 5951( 9) - 10/11/95 09:04 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 2 HE-1104- FOS/RD ACQ/BIN 4.3 MIRROR 1 15S ONBOARD ACQ for 3-6 1805A ARY ------------------------------------------------------------------------------------------------------------------------------------ 3 HE-1104- FOS/RD ACCUM 4.3 G270H 1 1589S 1805A ------------------------------------------------------------------------------------------------------------------------------------ 4 HE-1104- FOS/RD ACCUM 4.3 G270H 1 2476S 1805B ------------------------------------------------------------------------------------------------------------------------------------ 5 HE-1104- FOS/RD ACCUM 4.3 G270H 1 2476S 1805B ------------------------------------------------------------------------------------------------------------------------------------ 6 HE-1104- FOS/RD ACCUM 4.3 G270H 1 2476S 1805B ------------------------------------------------------------------------------------------------------------------------------------ 5951( 9) - 10/11/95 09:04 - [ 5] Summary Form for Proposal 5951 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/RD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/BINARY ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Quasars ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ for 3-6 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G270H ------------------------------------------------------------------------------------------------------------------------------------ Target Names HE-1104-1805A HE-1104-1805B ------------------------------------------------------------------------------------------------------------------------------------