5639( 13) - 11/03/95 09:01 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5639 Version: 13 Check-in Date: ********** 1.Proposal Title: HST SPECTROSCOPY OF CYGNUS A -II. SPECTROSCOPY ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle QUASARS & AGN, RADIO GO 4 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: NEAL JACKSON 6870 ------------------------------------------------------------------------------------ 6. Abstract We propose to obtain spectroscopy of the nucleus and extended line emitting knot of the prototypical high-power radio galaxy Cygnus A. Ground based images and spectra have so far failed to provide convincing explanations for the ionization structure of the line emission or proof for the model in which the continuum light is due to scattering of a hidden quasar nucleus. By using the HST resolution to exclude contaminating continuum-emitting components we will be able to do two things. First, we will be able to search for a broad Balmer line in the central sources, which would be proof of the existence of a hidden quasar nucleus: only marginal evidence of this broad component exists from ground-based spectra. Second, we will be able to select out the high surface brightness condensation in the northwest line-emitting component. This will be examined to clarify the kinematics, find out if it is the location of the narrow line "moving component" and examine the excitation mechanism of the emission lines in a clearly defined region rather than the average over the whole source typically seen in ground based images. ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5639( 13) - 11/03/95 09:01 - [ 2] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 3C405-OFFSET STAR, COMPOSITE XI-OFF= -2.989" +/- 1.137", ETA- J2000 V = 16.5 +/- 0.2 SPECTRAL TYPE OFF= 22.609" +/- 0.100", FROM 2 Comments: OFFSET IS N AND SLIGHTLY W OF THE TARGET NUMBER 2 2 3C405-NUC GALAXY, RADIO GALAXY RA=19H 59M 28.313S +/- 0.002S, J2000 Z = SURF(V) = 19.0 +/- 0.2 DEC= 40D 44' 2.36" +/- 0.05" 0.0567 E(B-V) = 7.0 +/- 1.0 E-1 Comments: V SURFACE BRIGHTNESS BASED ON 12.2 ARCSEC**2 APERTURE OF VAN DEN BERGH, APJ 210 L63. DISTRN OF E(B-V) COMPLEX AND VARIES OVER SOURCE. 3 3C405-NW GALAXY, RADIO GALAXY XI-OFF= -0.887" +/- 1.137", ETA- J2000 Z = SURF(V) = 20.3 +/- 0.2 OFF= 0.516" +/- 0.100", FROM 2 0.0567 SURF(R) = 19.1 +/- 0.2 F-LINE(3727.0) = 6.0 +/- 1.0 E-15 Comments: SURFACE BRIGHTNESSES BASED ON VESTERGAARD & BARTHEL AJ 105 456 3727 FLUX IS IN CENTRAL KNOT VISIBLE IN OUR FOC OBSERVATION 5007 LINE SHOULD BE AT LEAST 3X AS BRIGHT AS OII 5639( 13) - 11/03/95 09:01 - [ 3] 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 ------------------------------------------------------------------------------------------------------------------------------------ 10 3C405- FOS/RD ACQ/PEA 4.3 G570H SEARCH-SIZE- 1 5S ONBOARD ACQ FOR 15 OFFSET K Y=3, SEARCH- SIZE-X=1, SCAN- STEP-Y=0.123 ------------------------------------------------------------------------------------------------------------------------------------ 15 3C405- FOS/RD ACQ/PEA 1.0 G570H SEARCH-SIZE- 1 5S ONBOARD ACQ FOR 20 OFFSET K Y=2, SEARCH- SIZE-X=6, SCAN- STEP-Y=0.61, SCAN-STEP- Comments: X=0.61 ------------------------------------------------------------------------------------------------------------------------------------ 20 3C405- FOS/RD ACQ/PEA 0.5 G570H SEARCH-SIZE- 1 5S ONBOARD ACQ FOR 25 OFFSET K Y=3, SEARCH- SIZE-X=3, SCAN- STEP-Y=0.29, SCAN-STEP- Comments: X=0.29 ------------------------------------------------------------------------------------------------------------------------------------ 25 3C405- FOS/RD ACQ/PEA 0.3 G570H SEARCH-SIZE- 1 5S ONBOARD ACQ FOR 30 OFFSET K Y=3, SEARCH- SIZE-X=3, SCAN- STEP-Y=0.17, SCAN-STEP- Comments: X=0.17 ------------------------------------------------------------------------------------------------------------------------------------ 30 3C405- FOS/RD ACQ/PEA 0.3 G570H SEARCH-SIZE- 1 20S ONBOARD ACQ FOR 40-60 OFFSET K Y=5, SEARCH- SIZE-X=5, SCAN- STEP-Y=0.052, SCAN-STEP- Comments: EXP TIMES ARE FOR CRITICAL PEAKUP ON STAR OF X=0.052 16.5MAG. AFTER PEAKUP SLEW DIRECTLY TO TARGET USING OFFSETS GIVEN ------------------------------------------------------------------------------------------------------------------------------------ 40 3C405-NUC FOS/RD ACCUM 0.3 G570H 4571.0- 1 5660S 6820.0 Comments: S-N CTM/DIODE FOR 0.3" APT APPLIED TO FOC IMAGE. LINES >100A EQ.W. ------------------------------------------------------------------------------------------------------------------------------------ 50 3C405-NUC FOS/RD ACCUM 0.3 G780H 6272.0- 1 3860S 9219.0 Comments: AFTER THIS EXPOSURE SLEW TO TARGET IN LINENUM 6 USING OFFSETS GIVEN IN TARGET LISTS ------------------------------------------------------------------------------------------------------------------------------------ 5639( 13) - 11/03/95 09:01 - [ 4] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 60 3C405-NW FOS/RD ACCUM 0.3 G570H 4571.0- 1 3860S 6820.0 Comments: S-N BASED ON 0.3" APERTURE APPLIED TO FOC IMAGE. ------------------------------------------------------------------------------------------------------------------------------------ 5639( 13) - 11/03/95 09:01 - [ 5] Summary Form for Proposal 5639 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/RD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SEARCH-SIZE-Y=3 SEARCH-SIZE-X=1 SCAN-STEP-Y=0.123 SCAN-STEP-X=0.61 SCAN-STEP-X=0.29 SCAN-STEP-X=0.17 SCAN-STEP-X=0.052 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category QUASARS & AGN, RADIO GALAXIES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 15 ONBOARD ACQ FOR 20 ONBOARD ACQ FOR 25 ONBOARD ACQ FOR 30 ONBOARD ACQ FOR 40-60 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G570H G780H ------------------------------------------------------------------------------------------------------------------------------------ Target Names 3C405-OFFSET 3C405-NUC 3C405-NW ------------------------------------------------------------------------------------------------------------------------------------