! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! Id: 6103 ! ! For help call your Program Coordinator: Max Mutchler ! Phone: 410 338-1321 , E-mail: mutchler@stsci.edu Proposal_Information Title: Ne VIII 774 Emission From QSOs Proposal_Category: GO Scientific_Category: Quasars Cycle: 5 Investigators PI_name: Frederick Hamann PI_Institution: University of California at San Diego CoI_Name: E. Margaret Burbidge CoI_Institution: University of California at San Diego Contact: N ! Y or N (designate at most one contact) CoI_Name: Ross Cohen CoI_Institution: University of California at San Diego Contact: N CoI_Name: Vesa Junkkarinen CoI_Institution: University of California at San Diego Contact: N CoI_Name: Joseph Shields CoI_Institution: Steward Observatory Contact: N CoI_Name: David Tytler CoI_Institution: University of California at San Diego Contact: N CoI_Name: Lin Zuo CoI_Institution: University of California at San Diego Contact: N Abstract: ! Free format text (please update) We will observe and analyze a sample of four QSOs to verify tentative detections of the very high ionization broad emission line, Ne VIII 774. This line has not been securely identified in any QSO, but our analysis of one probable detection shows that it would require a new understanding of QSO environments. In particular, (1) Ne VIII implies much higher ionization in the broad emission line region (BELR) than previously recognized, and (2) the physical conditions required for Ne VIII are equivalent to those needed for both X-ray "warm absorbers" and optically thin models of the "big blue bump." Related work by investigators on this project also shows that associated Ne VIII 774 absorption occurs within ~200 pc of at least one QSO. Thus, Ne VIII emission might be a tracer of the hot gas responsible for these various other features, and it could identify that gas as part of the BELR. The proposed study will take a necessary step toward determining the strength and frequency of Ne VIII 774 emission in QSO samples. Negative results would establish the first firm upper limits on the BELR ionization. Positive results would (1) directly measure the ionization in a newly identified hot component of the BELR, (2) determine the amount of hot gas present, and (3) establish the feasibility of linking the BELR with other high energy phenomena. Questions ! Free format text (please update) Observing_Description: We will use FOS/BL and the G160L and G270H gratings to obtain spectra with complete wavelength coverage from ~1200 to ~3300 Angstrom in two QSOs. We will use the Binary Search acquisition and the 1.0" aperture. We will use only FOS/BL (instead of FOS/RD for the G270H setting) so the two gratings can be used in one orbit without switching detectors. For the exposure times given below, we expect SNRs per diode of ~25 to 35 for each object and each grating setting (based on fluxes measured previously with the FOS and the count rates given in version 5.0 of the FOS Manual (Fig. 1.2.3). Real_Time_Justification: None. Calibration_Justification: ! Move appropriate text from We request that wavelength calibration lamps are measured at each grating setting to minimize the wavelength uncertainties caused by grating shifts. We request that the lamp exposures are obtained DURING OCCULTATION to maximize the science target exposure times. Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: PKS0355-48 Alternate_Names: Description: GALAXY, Quasar, BLR Position: RA=3H 57M 21.87S +/- 0.3S, DEC=-48D 12' 15.3" +/- 0.5", PLATE-ID=03C0 Equinox: 2000 Epoch: 1977.777 RV_or_Z: Z=1.005 Flux: V=16.38, B-V=0.33 F-CONT(800) = 3.2 +/- .4 E-15 F-CONT(1350) = 2.1 +/- .3 E-15 Comments: Target_Number: 2 Target_Name: Q1435-0134 Alternate_Names: Description: GALAXY, QSO, BLR Position: RA=14H 37M 48.26S +/- 0.3S, DEC=-1D 47' 11.3" +/- 0.5", PLATE-ID=00WN Equinox: 2000 Epoch: 1980.218 RV_or_Z: Z=1.310 Flux: V=16.0, B-V=0.3+/- 0.1 ! Include at least V and B-V F-CONT(695) = 4.8 +/- .5 E-15 F-CONT(1175) = 5.0 +/- .6 E-15 Comments: ! This is a template for a single visit containing a single exposure ! Repeat exposure and visit blocks as needed Visits ! Section 6 Visit_Number: 1 Visit_Requirements: ! Section 7.1 ! Uncomment or copy visit level special requirements needed ! Most of these requirements (including ORIENT) will limit scheduling ! PCS MODE [Fine | Gyro] ! GUIDing TOLerance ! ORIENTation TO ! ORIENTation TO FROM ! ORIENTation TO FROM NOMINAL ! SAME ORIENTation AS ! CVZ ! PARallel ! AFTER [BY [TO ]] ! AFTER ! BEFORE ! BETWEEN AND ! GROUP WITHIN