! +====================+ ! | PED OUTPUT PRODUCT | ! +====================+ ! ! /tmp_mnt/cerb/u1/pstanley/peggy/5942/5942.prop ! Generated by PREPROCESSOR, version 6.0e ! Date: Mon Jan 22 14:39:41 EST 1996 Proposal_Information Title: THE NATURE OF THE STAR FORMATION TRIGGER IN NGC 1068 Proposal_Category: GO Scientific_Category: AGN Cycle: 5 Investigators PI_Name: Frederick Bruhweiler PI_Institution: The Catholic University of America CoI_Name: Andrew M. Smith CoI_Institution: NASA/Goddard Space Flight Center Contact: CoI_Name: Wayne Landsman CoI_Institution: STX Corporation Contact: CoI_Name: Eliot Malumuth CoI_Institution: Computer Sciences Corporation Contact: CoI_Name: Allen Home CoI_Institution: Catholic University of America Contact: CoI_Name: Dennis Ebbets CoI_Institution: Ball Areospace Group Contact: Abstract: We propose to use the GHRS/G140L and the PC of the WFPC2 to observe four very bright and luminous starburst knots and the nebular emission within the inner 3 Kpc region of NGC 1068. The resulting spectra of the knots will be modeled with our population synthesis code, which incorporates a new library of high dispersion IUE stellar spectra. The use of this powerful new tool will place strong constraints on the stellar ages and the star formation history in these knots. These data in combination with the PC imagery will be compared with the the expectations for the possible triggering mechanisms that might be responsible for the luminous knot in the inner 3 Kpc. Specifically, we will explore if our inferred ages for the knots and the high angular resolution emission line morphology are consistent with the star formation being initiated by the strong radiation field from the central AGN, stochastic processes, or passage of spiral density waves through the inner CO Ring of the galaxy. Questions Observing_Description: Spectra will be acquired of four individual starburst knots within the central 3 kpc region of NGC 1068. The knots to be observed are knots 1, 3, 4, and 8a (see Fig. 1 & Bruhweiler, Truong, and Altner 1991). Knots 1 & 4 lie inside the beam of photoionizing radiation from the nucleus, while the other two knots lie outside. These observations will be made using the GHRS with the G140L configuration through the 1.74"x1.74" Large Science Aperture. The GHRS/G140L combination is about a factor of 2 more sensitive and yields almost a factor of two better resolution than the FOS high resolution gratings. Knots 1, 3, and 4 are estimated to be less than 1.75'' in diameter, as determined from a previous WFPC imagery in the U -band. The effective spectral resolution will be ~ 5 times better than our IUE data with a much better S/N ratio as well. (All the data will be at least the quality of knot No.2 shown in Fig.2) Exposure Time Estimates & Orbit Calculation: We estimated flux levels for the knots based upon IUE data in Bruhweiler, Truong, & Altner (1991), and on our previous U- band WFPC imagery for the knots obtained in program 3852. We used the flux above for 1350Angstrom\\ and multiplied by the sensitivity for the G140L (166x10^11) given in Table 8-2 in the GHRS handbook. For comb=4, these count rates are divided by 4 to give the counts/datapoint. for the G140L. For each knot exposures are calculated to maximize the use of the orbits. For knot 1, we get a count rate/diode=0.41cts/s, or or count rate/datapoint=0.1cts/s. There are 52 available minutes per orbit. Subtracting(11+12) minutes for acquisition and 8 min for peak-up, leaves 21 minutes for exposures. Allowing 4 minutes per exposure before reading out (1 minute), to avoid smearing due the the Earth's magnet field, gives 4-4min exposure segments for the first orbit. This is shy of the S/N=10. The second orbit, counting again the 1 minute readout for each 4 min exposure segment, gives another 40 min available for actual exposures. For a total of 52 minutes exposure for the 2 orbits, we get a total of 290 counts/datapoint or S/N=17. In the table below, we give the estimated exposure information for each of the knots to be observed. The instrument to be used, grating settings, wavelength coverage, observed fluxes estimated from our previous IUE and GHRS work, requested exposure time, and S/N are given in the table. noindent Instrument Grating Wavelength Flux Exp.(min.) (S/N), KNOT \\#1:, GHRS G140L 1170-1450 2.5E-14 52 17, KNOT \\#3:, GHRS G140L 1170-1450 1.2E- 14 52 12, KNOT \\#4:, GHRS G140L 1170-1450 9.0E-15 96 14, KNOT \\#8A:, GHRS G140L 1170-1450 7.5E-15 96 12, ----------------------------------------- -----------------------------, The spectra can all be obtained in ten (10) orbits. IMAGERY During episode 4, Holland Ford (program 5124) is obtaining Planetary Camera imagery with a large filter sample to explore the nebular emission associated with the AGN of NGC 1068. This imagery, if obtained, would be ideal for our purposes. We propose to use these data when they become available and to acquire additional exposures in other bandbasses necessary for proper interpretation of nebular emission associated with the UV knots. We request 3 additional PC images to complement those to be acquired during Cycle 4. We will acquire PC imagery using the following filters and exposures, F160BW (2x1200sec), F487N (2x400 sec), and F814W (2x400sec). These will be combined with existing or soon to be acquired imagery to obtain absolute fluxes for H Alpha and to gain complete UV photometry for the UV-knots (F160BW), and to correct for stellar continuum in H Alpha\\ imagery and to serve as a check on the redleak for the F336W filter. Real_Time_Justification: Not Applicable. Not Applicable Calibration_Justification: Additional_Comments: Fixed_Targets Target_Number: 1 Target_Name: NGC1068-NUC Alternate_Names: Description: GALAXY, NUCLEUS Position: RA=02H 42M 40.6S +/- 0.04",DEC=-00D 00' 48" +/- 0.04" Equinox: J2000.0 RV_or_Z: V=1136 RA_PM: 0.0 Dec_PM: 0.0 Epoch: J2000 Annual_Parallax: 0 Flux: SURF(V) = 14 E(B-V) = 0.0 Comments: Galactic Extinction ( B Mag)=0.05 Target_Number: 2 Target_Name: NGC1068-POS1 Alternate_Names: Description: GALAXY,STAR FORMING REGION Position: RA=02H 42M 40.30S +/- 0.04",DEC=-00D 00' 37.58" +/- 0.04", PLATE-ID=0085 Equinox: J2000.0 RV_or_Z: V=1136 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0 Flux: SURF(V) = 14 E(B-V) = 0.0 Comments: Estimated Flux(1170-1450 A)=2.5E-14 erg cm-2s-1A-1 Galactic Extinction (B Mag) = 0.05 Target_Number: 3 Target_Name: NGC1068-POS3 Alternate_Names: Description: GALAXY, STAR FORMING REGION Position: RA=02H 42M 39.92S +/- 0.04",DEC=-00D 00' 44.68" +/- 0.04", PLATE-ID=0085 Equinox: J2000.0 RV_or_Z: V=1136 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0 Flux: SURF(V) = 14 E(B-V) = 0.0 Comments: Estimated Flux(1170-1450 A)=1.2E-14 erg cm-2s-1A-1 Galactic Extinction (B Mag) = 0.05 Target_Number: 4 Target_Name: NGC1068-POS4 Alternate_Names: Description: GALAXY, STAR FORMING REGION Position: RA=02H 42M 41.45S +/- 0.04",DEC=-00D 00' 37.18" +/- 0.04", PLATE-ID=0085 Equinox: J2000.0 RV_or_Z: V=1136 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0 Flux: SURF(V) = 14 E(B-V) = 0.0 Comments: Estimated Flux(1170-1450 A)=9.0E-14 erg cm-2s-1A-1 Galactic Extinction (B Mag) = 0.05 Target_Number: 5 Target_Name: NGC1068-POS8A Alternate_Names: Description: GALAXY, STAR FORMING REGION Position: RA=02H 42M 39.87S +/- 0.04",DEC=-00D 00' 58.18" +/- 0.04", PLATE-ID=0085 Equinox: J2000.0 RV_or_Z: V=1136 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0 Flux: SURF(V) = 14 E(B-V) = 0.0 Comments: Estimated Flux(1170-1450 A)=7.5E-14 erg cm-2s-1A-1 Galactic Extinction (B Mag) = 0.05 Target_Number: 6 Target_Name: NGC1068-NUC-ACQ Alternate_Names: Description: GALAXY, NUCLEUS Position: RA=02H 42M 40.64S +/- 0.04",DEC=-00D 00' 47.58" +/- 0.04", PLATE-ID=0085 Equinox: J2000.0 RV_or_Z: V=1136 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0 Flux: SURF(V) = 14 E(B-V) = 0.0 Comments: Galactic Extinction ( B Mag)=0.05. New target created after early acquisition data from visit 01. Solar_System_Targets Generic_Targets Scan_Data Visits Visit_Number: 01 Visit_Requirements: On_Hold_Comments: Visit_Comments: Purpose is to obtain PC imagery Exposure_Number: 1 Target_Name: NGC1068-NUC Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F160BW Wavelength: 1523 Optional_Parameters: CR-SPLIT=DEF Number_of_Iterations: 1 Time_Per_Exposure: 2400S Special_Requirements: Comments: Exposure_Number: 2 Target_Name: NGC1068-NUC Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F487N Wavelength: 4866 Optional_Parameters: CR-SPLIT=DEF Number_of_Iterations: 1 Time_Per_Exposure: 3400S Special_Requirements: Comments: Exposure_Number: 4 Target_Name: NGC1068-NUC Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F673N Wavelength: 6732 Optional_Parameters: CR-SPLIT=DEF Number_of_Iterations: 1 Time_Per_Exposure: 1800S Special_Requirements: Comments: Visit_Number: 02 Visit_Requirements: On_Hold_Comments: Visit_Comments: Visit has now been taken off hold Exposure_Number: 10 Target_Name: NGC1068-NUC-ACQ Config: HRS Opmode: ACQ Aperture: 2.0 Sp_Element: MIRROR-N1 Wavelength: Optional_Parameters: BRIGHT=RETURN,SEARCH-SIZE=5 Number_of_Iterations: 1 Time_Per_Exposure: 50S Special_Requirements: ONBOARD ACQ FOR 20-40; Comments: Acquisition for offset slew to NGC1068-knot1; STEP-TIME=2.0S Exposure_Number: 20 Target_Name: NGC1068-POS4 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140L Wavelength: 1313 Optional_Parameters: FP-SPLIT=STD Number_of_Iterations: 7 Time_Per_Exposure: 435.2S Special_Requirements: Comments: SPECTRUM OF KNOT#4 1170-1456 ANG Exposure_Number: 30 Target_Name: NGC1068-POS4 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140L Wavelength: 1313 Optional_Parameters: FP-SPLIT=STD Number_of_Iterations: 7 Time_Per_Exposure: 435.2S Special_Requirements: Comments: SPECTRUM OF KNOT#4 1170-1456 ANG Exposure_Number: 40 Target_Name: NGC1068-POS1 Config: HRS Opmode: ACQ Aperture: 2.0 Sp_Element: MIRROR-N1 Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 18S Special_Requirements: ONBOARD ACQ FOR 50-80; Comments: ACQ ON KNOT #1. STEP-TIME=2.0S Exposure_Number: 50 Target_Name: NGC1068-POS1 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140L Wavelength: 1313 Optional_Parameters: FP-SPLIT=STD Number_of_Iterations: 7 Time_Per_Exposure: 435.2S Special_Requirements: Comments: Spectrum of Knot#1 1170-1456 Ang Exposure_Number: 60 Target_Name: NGC1068-POS3 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140L Wavelength: 1313 Optional_Parameters: FP-SPLIT=STD Number_of_Iterations: 7 Time_Per_Exposure: 435.2S Special_Requirements: Comments: SPECTRUM OF KNOT#3 1170-1456 ANG Exposure_Number: 70 Target_Name: NGC1068-POS8A Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140L Wavelength: 1313 Optional_Parameters: FP-SPLIT=STD Number_of_Iterations: 6 Time_Per_Exposure: 435.2S Special_Requirements: Comments: SPECTRUM OF KNOT#8A 1170-1456 ANG Exposure_Number: 80 Target_Name: NGC1068-POS8A Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140L Wavelength: 1313 Optional_Parameters: FP-SPLIT=STD Number_of_Iterations: 6 Time_Per_Exposure: 435.2S Special_Requirements: Comments: SPECTRUM OF KNOT#8A 1170-1456 ANG Data_Distribution ! 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