! Proposal 6747, submission 2
! PI: Gerard Kriss
! Received Thu Apr 25 14:53:01 EDT 1996
! From: gak@jhufos.pha.jhu.edu
! Date: Mon Apr 22 15:55:19 EDT 1996
Proposal_Information
Title: A Snapshot of the UV Spectrum of NGC 7469
Proposal_Category: GO
Scientific_Category: AGN
Cycle: 6
Investigators
PI_Name: Gerard Kriss
PI_Institution: Johns Hopkins University
CoI_Name: Bradley Peterson
CoI_Institution: The Ohio State University
Contact:
CoI_Name: Wei Zheng
CoI_Institution: Johns Hopkins University
Contact:
CoI_Name: D. Michael Crenshaw
CoI_Institution: Computer Sciences Corporation/GSFC
Contact:
Abstract:
In July of 1996 the International AGN Watch will monitor the
Seyfert 1 galaxy NGC 7469 continuously for 30 days using the
International Ultraviolet Explorer, the X-ray Timing Explorer
and a network of ground-based observatories. The IUE and
optical data will be used to determine the structure and
kinematics of the broad-line region in this active galactic
nucleus through reverberation mapping. The simultaneous
optical, IUE and XTE data will probe the connections between
the optical, UV and X-ray continua with an unprecedented
combination of high temporal resolution and long duration. We
propose to obtain a high signal-to-noise snapshot of the UV
spectrum from 1150--3300 Angstrom during this intensive
monitoring period using the high resolution gratings of the
Faint Object Spectrograph. This spectrum will allow us to
disentangle the UV continuum more accurately from the broad
wings of the emission lines, identify clean continuum windows
free of contaminating emission and absorption, and deblend
line complexes such as LyAlpha+N V, C IV+He II+O III,
Si III+C IIII and Mg II+Fe II. This high resolution
spectrum will then serve as a template for deblending and
measuring the lower resolution IUE spectra.
Questions
Observing_Description:
We will observe NGC 7469 using gratings G130H, G190H, and
G270H on the blue side of the FOS through the 1.0" aperture.
Since we desire high signal-to-noise (S/N) and because NGC
7469 is variable, we will use a precision peak-up target
acquisition sequence to center the active nucleus to within
0.04". This will require one orbit plus 17 m of the second
orbit to complete. Given the 53 m visibility available for
NGC 7469, the remainder of the second orbit and the full third
orbit will be used to integrate for 3820 s using grating
G130H. On the fourth and final orbit we will observe for 1720
s with grating G190H and for 420 s with grating G270H. Using
the mean flux observed in archival IUE spectra, inverse
sensitivities from Table 1-6 of Version 6.0 of the FOS
Instrument Handbook (June 1995) for the blue detector, and
aperture throughputs from Table 1-8, we anticipate S/N ratios
per Angstrom in the continuum as tabulated below. We include
a dark-count rate of 0.01 cts s^-1 in our calculations.
Should NGC 7469 drop as much as a factor of 4 below the lowest
observed historical flux level of 3.4e-14 at 1450 A, we will
still achieve S/N > 15 per resolution element at all continuum
wavelengths longward of redshifted LyAlpha, adequate for our
scientific needs.
Wavelength F_Lambda Grating Expected Lowest
(Angstrom) (10^-14) S/N S/N
1200 5.0 G130H 15 8
1550 4.9 G130H 40 18
1650 4.5 G190H 38 19
2250 2.9 G190H 70 28
2350 3.5 G270H 48 18
3100 3.0 G270H 72 28
Real_Time_Justification:
We request that the proposed observations be scheduled during
the 30-day interval of continuous IUE observations. This will
minimize any changes in line shapes that might occur between
the FOS and IUE observations and ensure that we can reliably
deblend the lower resolution IUE data.
This proposal is part of an extensive campaign by the
International AGN Watch to monitor NGC 7469 continuously with
IUE for 30 days, with an additional 180 hours of coverage
spanning the whole observing window. During the 30-day
continuous monitoring interval (10 Jun - 10 Jul),
simultaneous, continuous observations will be carried out
using the X-ray Timing Explorer (XTE). Both of these programs
are approved and are in the process of being scheduled for
the June--July window in 1996. Our network of ground-based
observatories is also ready to begin monitoring NGC 7469.
Calibration_Justification:
Additional_Comments:
Fixed_Targets
Target_Number: 1
Target_Name: NGC7469
Alternate_Names: GSC1160-00656
Description: GALAXY, SEYFERT
Position: RA=23H 03M 15.62S +/- 0.3",DEC=08D 52' 25.6" +/- 0.3",PLATE-ID=028Z
Equinox: 2000
RV_or_Z: Z=0.0160
RA_PM: 0.0
Dec_PM: 0.0
Epoch:
Annual_Parallax: 0.0
Flux:
V = 13.10+/-0.5
B-V = 0.48
F(1300)=5.0e-14
Comments: Flux is for nucleus. Whole galaxy has V=11.1.
Visits 1
Solar_System_Targets
Generic_Targets
Scan_Data
Visits
Visit_Number: 01
Visit_Requirements:
SCHED 100%
BETWEEN 10-Jun-1996 AND 10-Jul-1996
On_Hold_Comments:
Visit_Comments:
Exposure_Number: 1
Target_Name: NGC7469
Config: FOS/BL
Opmode: ACQ/PEAK
Aperture: 4.3
Sp_Element: MIRROR
Wavelength:
Optional_Parameters: SCAN-STEP-Y=1.204,SEARCH-SIZE-X=1,SEARCH-SIZE-Y=3
Number_of_Iterations: 1
Time_Per_Exposure: 0.3S
Special_Requirements:
ONBOARD ACQ FOR 2
Comments: STAGE 1 OF 5-STAGE CRITICAL PEAK UP.
Exposure_Number: 2
Target_Name: NGC7469
Config: FOS/BL
Opmode: ACQ/PEAK
Aperture: 1.0
Sp_Element: MIRROR
Wavelength:
Optional_Parameters: SCAN-STEP-X=0.61,SCAN-STEP-Y=0.61,SEARCH-SIZE-X=6,SEARCH-SIZE-Y=2
Number_of_Iterations: 1
Time_Per_Exposure: 0.3S
Special_Requirements:
ONBOARD ACQ FOR 3
Comments: STAGE 2 OF 5-STAGE CRITICAL PEAK UP.
Exposure_Number: 3
Target_Name: NGC7469
Config: FOS/BL
Opmode: ACQ/PEAK
Aperture: 0.5
Sp_Element: MIRROR
Wavelength:
Optional_Parameters: SCAN-STEP-X=0.29,SCAN-STEP-Y=0.29,SEARCH-SIZE-X=3,SEARCH-SIZE-Y=3
Number_of_Iterations: 1
Time_Per_Exposure: 0.4S
Special_Requirements:
ONBOARD ACQ FOR 4
Comments: STAGE 3 OF 5-STAGE CRITICAL PEAK UP.
Exposure_Number: 4
Target_Name: NGC7469
Config: FOS/BL
Opmode: ACQ/PEAK
Aperture: 0.3
Sp_Element: MIRROR
Wavelength:
Optional_Parameters: SCAN-STEP-X=0.17,SCAN-STEP-Y=0.17,SEARCH-SIZE-X=3,SEARCH-SIZE-Y=3
Number_of_Iterations: 1
Time_Per_Exposure: 0.4S
Special_Requirements:
ONBOARD ACQ FOR 5
Comments: STAGE 4 OF 5-STAGE CRITICAL PEAK UP.
Exposure_Number: 5
Target_Name: NGC7469
Config: FOS/BL
Opmode: ACQ/PEAK
Aperture: 0.3
Sp_Element: MIRROR
Wavelength:
Optional_Parameters: SCAN-STEP-X=0.052,SCAN-STEP-Y=0.052,SEARCH-SIZE-X=5,SEARCH-SIZE-Y=5
Number_of_Iterations: 1
Time_Per_Exposure: 3.5S
Special_Requirements:
ONBOARD ACQ FOR 6
Comments: STAGE 5 OF 5-STAGE CRITICAL PEAK UP.
Exposure_Number: 6
Target_Name: NGC7469
Config: FOS/BL
Opmode: ACCUM
Aperture: 1.0
Sp_Element: G130H
Wavelength:
Optional_Parameters:
Number_of_Iterations: 1
Time_Per_Exposure: 3820S
Special_Requirements:
Comments:
Exposure_Number: 7
Target_Name: WAVE
Config: FOS/BL
Opmode: ACCUM
Aperture: 1.0
Sp_Element: G130H
Wavelength:
Optional_Parameters:
Number_of_Iterations: 1
Time_Per_Exposure: DEF
Special_Requirements:
Comments:
Exposure_Number: 8
Target_Name: WAVE
Config: FOS/BL
Opmode: ACCUM
Aperture: 1.0
Sp_Element: G190H
Wavelength:
Optional_Parameters:
Number_of_Iterations: 1
Time_Per_Exposure: DEF
Special_Requirements:
Comments:
Exposure_Number: 9
Target_Name: NGC7469
Config: FOS/BL
Opmode: ACCUM
Aperture: 1.0
Sp_Element: G190H
Wavelength:
Optional_Parameters:
Number_of_Iterations: 1
Time_Per_Exposure: 1720S
Special_Requirements:
Comments:
Exposure_Number: 10
Target_Name: NGC7469
Config: FOS/BL
Opmode: ACCUM
Aperture: 1.0
Sp_Element: G270H
Wavelength:
Optional_Parameters:
Number_of_Iterations: 1
Time_Per_Exposure: 300S
Special_Requirements:
Comments:
Exposure_Number: 11
Target_Name: WAVE
Config: FOS/BL
Opmode: ACCUM
Aperture: 1.0
Sp_Element: G270H
Wavelength:
Optional_Parameters:
Number_of_Iterations: 1
Time_Per_Exposure: DEF
Special_Requirements:
Comments:
Data_Distribution ! Defaults indicated; change if desired
Medium: 8MM
Blocking_Factor: 10
Ship_To: Dr. Gerard A. Kriss*Department of Physics & Astronomy*Johns Hopkins University*3701 San Martin Drive*Baltimore, MD 21218
Ship_Via: UPS
Recipient_Email: gak@pha.jhu.edu
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