Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 5681 Report Date: 18-Jul-95:17:51 Version: ********** Check-in Date: ********** 1.Proposal Title: UV SPECTRA OF LOW-REDSHIFT QSOS, HE I AUGMENTATION: CYCLE 4 CARRYOVER ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID QUASARS & AGN AUG/FOS 4078 Sub Category AUG/FOS ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone E. margaret Burbidge UNIVERSITY OF CALIFORNIA, SA USA 619-534-4477 ------------------------------------------------------------------------------------ 7. Abstract In a collaborative program with the GHRS IDT, we will study absorption from He I in the Lyman alpha forest clouds and in the intergalactic medium at high z to determine conditions in the early universe. Lyman alpha and beta lines will be measured in this proposal. The He I lines will be measured in another proposal. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 2.90 par: 0 10. Num targs pri: 1 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FOS ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 5681 PI: E. margaret Burbidge Proposal Title: UV SPECTRA OF LOW-REDSHIFT QSOS, HE I AUGMENTATION: CYCLE 4 CARRYOVER ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Richard J. Harms APPLIED RESEARCH CORPORATION USA Richard G. Allen UNIVERSITY OF ARIZONA USA J. Roger P. Angel UNIVERSITY OF ARIZONA USA Frank Bartko UNAFFILIATED USA Edward Beaver UC, SAN DIEGO USA Ralph C. Bohlin SPACE TELESCOPE SCIENCE USA INSTITUTE Pi E. Margaret Burbidge UC, SAN DIEGO USA Ross D. Cohen UC, SAN DIEGO USA Aurthur F. Davidsen JOHNS HOPKINS UNIVERSITY USA Holland C. Ford SPACE TELESCOPE SCIENCE USA INSTITUTE George F. Hartig SPACE TELESCOPE SCIENCE USA INSTITUTE Vesa T. Junkkarinen UC, SAN DIEGO USA Bruce H. Margon UNIVERSITY OF WASHINGTON USA ------------------------------------------------------------------------------------ 3. Description of proposed observations. A specially designed series of peak-ups will be performed to center the brightest object to +/-0.08" and a 2250s ACCUM observation performed with the 0.3" aperture, G270H grating, and red detector. A blind offset of 0.485" will be made to the second brightest object and another 2250s ACCUM observation will be made. Because the two targets are separated by only 0.485", a conventional peakup beginning with the 4.3" aperture would not work, while starting with a binary search places restrictions on the orientation and still requires a complex peakup because of the relatively large positional uncertainty following BSTA. Likewise for an interactive target acquisition. The errors in the measurements of offset stars and possible proper motion are too large to allow any simple scheme of offsets followed by peakups. The error budget is very small because the separation of the two brightest components is 0.48" so the maximum error that can be tolerated is 0.24" which means the one sigma error along the line connecting the two brightest components should not exceed 0.08". There are no WF images of the PG1115+080 field and the PC images of PG 1115+080 do not include the best offset stars. Ground based images (from CFHT) include the best offset stars but appear rotated relative to the PC images by 1.35 degrees. The error in the correction of the CCD rotation combined with centering and offset errors plus plausible proper motion (over 5 years) exceed the error budget allowable for acquisition of one of the fainter gravitational lens images and completely rule out direct offsets to either of the two brightest components from the best offset star about 51" away. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. He I lambda 584 cannot be observed redshifted into the optical in any known quasar. This object is one of the two best candidates for making these measurements. The associated Lyman-alpha and beta lines in this object also lie in the UV. The collecting area of HST and the sensitivity of the FOS and GHRS make it possible to obtain spectra with the signal to noise needed to carry out these studies of QSOs at wavelengths below the atmospheric cutoff. Page 3 ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. These observations will be reduced using the standard spectroscopy and polarimetry reduction software available for FOS data. Calibration will be done using the standard calibrations. The absorption features in QSO spectra will be measured using existing software that has been used for optical data and the early HST spectra. The H I column densities for comparison with the He I will be determined from curve-of-growth fits to L-alpha and L-beta. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. Optical spectroscopy and photometry will be performed using the facilities of Lick Observatory. We will try to make the optical observations simultaneous with the HST UV observations if possible. There are a number of related FOS IDT GTO proposals in cycles 0-3. These observations were originally written as portions of observations begun in those proposals. ------------------------------------------------------------------------------------ 9. Description of previous HST work. Collaborators have received data from a number of GTO programs, SAT, and ERO programs. Related programs which have had observations are as follows: 1026 - ``UV Spectra of Low-Redshift-QSOs'', 1027 - ``UV Spectra of QSOs with z> 3.1'', 1029 - ``Spectropolarimetry of QSOs, Blazars, and AGN'', and 1033 - ``Search for Misdirected BL Lac Objects''. Low resolution observations of three high redshift QSOs have not revealed any with light at He II lambda 304. Observations of UM 675 have shown that any He I Gunn--Peterson effect is small, that He I absorption lines are not strong, that predictions of the ``Lyman valley'' may be correct, and that low redshift Ly-alpha is more prevalent than expected. Observations of low redshift QSOs (including 3C 273) have shown even more clearly that Ly-alpha absorption occurs in greater numbers than expected, as well as showing emission-- line profile differences more clearly than from earlier data. Unexpectedly, Ly- alpha is narrower than H-alpha. ``HST Imaging of the Inner 3 Arcseconds of NGC 1068 in the Light of [O III] lambda5007'', I.N.Evans, H.C.Ford, A.L.Kinney, R.R.J.Antonucci, L.Armus, and S.Caganoff, {\it Ap.J.(Lett.)}, {\bf 369}, L27, 1991. ``Faint Object Camera Observations of a Globular Cluster Nova Field'', B.Margon, S.F.Anderson, R.A.Downes, R.C.Bohlin, and P.Jakobsen, {\it Ap.J.(Lett.)}, {\bf 369}, L71, 1991. ``Far--Ultraviolet Spectroscopy of the Quasar UM 675 with the Faint Object Spectrograph on the Hubble Space Telescope'', E.A.Beaver, E.M.Burbidge, R.D.Cohen, V.T.Junkkarinen, R.W.Lyons, E.I.Rosenblatt, G.F.Hartig, B.Margon, and A.F.Davidsen, {\it Ap.J.(Lett.)}, {\bf 377}, L1, 1991. ``The Ultraviolet Absorption Spectrum of 3C 273'', J.N.Bahcall, B.T.Jannuzi, D.P.Schneider, G.F.Hartig, R.Bohlin, and V.Junkkarinen, {\it Ap.J.(Lett.)}, {\bf 377}, L5, 1991. ``Faint Object Spectrograph Spectroscopy of Resolved Structure in the Nucleus of NGC 1068'', S.Caganoff, R.R.J.Antonucci, H.C.Ford, G.A.Kriss, G.Hartig, L.Armus, I.N.Evans, E.Rosenblatt, R.C.Bohlin, and A.L.Kinney, {\it Ap.J.(Lett.)}, {\bf 377}, L9, 1991. ``Faint Object Spectrograph Observations of the Low-Luminosity Seyfert Galaxy NGC 1566'', G.A.Kriss, G.F.Hartig, L.Armus, W.P.Blair, S.Caganoff, and L.Dressel, {\it Ap.J.(Lett.)}, {\bf 377}, L13, 1991. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). The majority of the resources required for this project other than the normal facilities of a university (librarys, offices, etc.) were supplied by NASA to the members of the FOS IDT for these projects. These include all the computing facilities required for the completion of data reduction and analysis. Optical and IR ground--based observing facilities and support are provided by the University of California and the University of Arizona. ------------------------------------------------------------------------------------ 11. Address Information Page 4 Name: E. MARGARET BURBIDGE Category: PI Institution: UNIVERSITY OF CALIFORNIA, SAN DIE Address: CASS 0111, UCSD 9500 GILMAN DRIVE City: LA JOLLA State: CA Zip Code: 920930111 Country: USA Telephone: 619-534-4477 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 5681 [ 5] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 4 PG1115+080A1 E,313,323,923, RA = 11H 18M 16.934S +/- 2000 Z=1.722 COMP 1 V=17.0 +/- 1.0 H,515,519 1.0", 2 F(2500)=1.5 +/- 0.3 E-15 DEC = 07D 45' 58.53" +/- 1.0", PLATE-ID = 00ZW, ------------------------------------------------------------------------------------------------------------------------------------ 7 PG1115+080A2 E,313,323,923, R = 0.485" +/- 0.03", 2000 Z=1.722 COMP 1 V=17.3 +/- 1.0 H,515,519 PA = 18.4D +/- 2D, 2 F(2500)=1.1 +/- 0.3 E-15 FROM 4, PLATE-ID = 00ZW, ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5681 [ 6] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PG1115+080A FOS/RD ACQ/ 1.0 MIRROR SCAN-STEP- 1 1.39S 1 1 ONBOARD ACQ FOR 1 PEAK X=0.61 2.0 SCAN-STEP- SEQ 1.0-4.0 NO GAP Y=0.61 CYCLE 4 / 1.0-4.0 SEARCH-SIZE-X=5 SEARCH-SIZE-Y=5 ------------------------------------------------------------------------------------------------------------------------------------ 2 PG1115+080A FOS/RD ACQ/ 0.5 MIRROR SCAN-STEP-X=0.3 1 1.5S 1 1 ONBOARD ACQ FOR 1 PEAK SCAN-STEP-Y=0.3 2.5 SEARCH-SIZE-X=4 SEARCH-SIZE-Y=4 ------------------------------------------------------------------------------------------------------------------------------------ 2.5 PG1115+080A FOS/RD ACQ/ 0.3 MIRROR SCAN-STEP- 1 1.6S 1 1 ONBOARD ACQ FOR 1 PEAK X=0.17 2.6 SCAN-STEP- Y=0.17 SEARCH-SIZE-X=4 SEARCH-SIZE-Y=4 ------------------------------------------------------------------------------------------------------------------------------------ 2.6 PG1115+080A FOS/RD ACQ/ 0.3 MIRROR SCAN-STEP- 1 15.8S 1 1 ONBOARD ACQ FOR 1 PEAK X=0.06 3.0 SCAN-STEP- Y=0.06 SEARCH-SIZE-X=5 SEARCH-SIZE-Y=5 ------------------------------------------------------------------------------------------------------------------------------------ 3 PG1115+080A FOS/RD ACCUM 0.3 G270H 2700 1 2250S 15 2 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 4 PG1115+080A FOS/RD ACCUM 0.3 G270H 2700 1 2250S 15 2 1 2 Comments: Blind offset after line 3.0 Total move is 0.485" ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 5681 [ 7] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/RD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SCAN-STEP-X=0.61 SCAN-STEP-Y=0.61 SEARCH-SIZE-X=5 SEARCH-SIZE-Y=5 SCAN-STEP-X=0.3 SCAN-STEP-Y=0.3 SEARCH-SIZE-X=4 SEARCH-SIZE-Y=4 SCAN-STEP-X=0.17 SCAN-STEP-Y=0.17 SCAN-STEP-X=0.06 SCAN-STEP-Y=0.06 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for AUG/FOS ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 2.90 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category QUASARS & AGN ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category AUG/FOS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 2.0; SEQ 1.0-4.0 NO GAP; CYCLE 4 / 1.0-4.0; ONBOARD ACQ FOR 2.5 ONBOARD ACQ FOR 2.6 ONBOARD ACQ FOR 3.0 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G270H ------------------------------------------------------------------------------------------------------------------------------------ Target Names PG1115+080A1 PG1115+080A2 ------------------------------------------------------------------------------------------------------------------------------------