I have made the suggested changes to the Phase II. I have increased the dither to 0.405 arcsec (8 pixels) as suggested.
I have also increased the exposure time in the Acquisition Image for Visits 1-31 from 2s to 4s as suggested.
I have adjusted the times to compensate for this change.
-1853929071
----- Attempting Submission 1 (Wed Aug 06 15:31:20 GMT 2025) -----
HST Phase II Proposal 18130 successfully submitted.
Receipt: # 18130-1
----- Attempting Submission 2 (Thu Aug 14 13:22:32 GMT 2025) -----
HST Phase II Proposal 18130 successfully submitted.
Receipt: # 18130-2
----- Attempting Submission 3 (Thu Jan 29 15:38:33 GMT 2026) -----
0
Assigned ID: 6236
----- Attempting Submission 1 (Wed Apr 09 16:07:35 GMT 2025) -----
HST Phase I Proposal 6236 successfully submitted.
Receipt: # 6236-1
----- Attempting Submission 2 (Thu Apr 10 14:54:47 GMT 2025) -----
HST Phase I Proposal 6236 successfully submitted.
Receipt: # 6236-2
Understanding AGN variability with Fairall 9: a legacy spectroscopic echo-mapping experiment with STIS
We propose HST monitoring of the X-ray bright, unobscured AGN, Fairall 9 with full UV-optical spectroscopic coverage with STIS at a 4-day cadence over a 5-month campaign, coupled with intensive Swift UV/X-ray (every 2 days) and sub-daily ground-based monitoring (3 per day). Our aims are 1) to determine the origin of the reverberating components, quantifying the compact accretion disk and the more extended inner wind and broad-line regions and thereby resolve the puzzle of light travel time lags and inferred accretion disk sizes being larger than expected from theory; 2) to determine the relationship between X-ray and UV-optical variations. The newest variability models predict that fluctuations propagate from an intrinsically variable UV disc into the X-ray corona, giving a UV lead, whereas disc reverberation models can only make UV lags. This HST+Swift+ground-based campaign will provide a legacy dataset to explore the fundamental variability mechanisms and give a template to interpret future continuum revervberation mapping experiments (e.g., LSST) on higher-redshift AGN.
We propose a campaign of coordinated monitoring of Fairall 9 (V~14, z = 0.0461), a bright, highly-variable, unobscured Type-1 AGN across the full UV and optical range. Fairall 9 is the best-studied, bright AGN for which there is high confidence that the line of sight is unobscured. Our campaign will observe Fairall 9 for one orbit every four days between 2026 Apr 17 to Sep 26 (31 orbits), with 4 low-resolution STIS gratings to cover the full 1150-10000 Ang spectral range, with parallel guaranteed UV/X-ray Swift visits (every 2 days) and ground-based monitoring (3 per day). We will employ STIS and four gratings to cover the full UV/optical range: G140L, G230L, G430L and G750L, all within a single orbit (with 100% schedulability). We aim to retrieve high-quality lightcurves across the full spectral range, thus we require stable spectrophometric calibration across the 5-month campaign. We will use the MSMOFF option for the FUV-MAMA and NUV-MAMA, and the E1-aperture for the optical CCD spectra. Flats for the G750L will be taken at the end of every visit. The observations cover the 3 long observing available windows and each visit has a 1-day window where it can be schedule (interval between visits do not require strict spacing between them, as long as they are on average 4 days apart). In parallel, we will observe a commonly used spectrophotometric standard star: LAWD-52, in three visits over the 5 months. The instrumental setup will be the same as the one used for Fairall 9, to trace changes in the calibration over the campaign.
Juan Hernandez Santisteban (PI) is an expert on reverberation mapping and PI of the Las Cumbres Observatory Key Project ("From Disc to Dust: Intensive Broadband Reverberation Mapping of Nearby Active Galactic Nuclei" ) which will provide the parallel intensive ground-based broadband photometry. He will also lead the coordination with the approved DDT on Swift.
Rick Edelson, Keith Horne, Elena Dalla Bonta and Marianne Vestergaard are experts on AGN physic, time-resolved spectroscopy and time series analysis. They also have substantial experience with HST/STIS data analysis.
Ethan Partington and Edward Cackett are experts on AGN X-ray analysis and continuum reverberation mapping techiniques.
Jonathan Gelbord is an expert in Swift/UVOT data analysis.
Michael Goad and Kirk Korista are experts on photoionization modelling of the BLR.
Chris Done and Scott Hagen are experts on time-resolved reverberation modelling, critical to interpret the dataset.
Roberta Vieliute is a PhD student working on reverberation mapping experiments, and will contribute towards the analysis of this dataset.
Supermassive Black Holes and Active Galaxies
6
false
true
false
false
false
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AVAILABLE
GALAXY
ACCRETION DISK
QSO
SEYFERT
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This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
J2000
CALIBRATION
PHOTOMETRIC
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
J2000
STIS/FUV-MAMA
Spectroscopic
No
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G140L
1425
STIS/NUV-MAMA
Spectroscopic
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G230L
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STIS/CCD
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G430L
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STIS/CCD
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G750L
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STIS/FUV-MAMA
Spectroscopic
No
No
G140L
1425
STIS/NUV-MAMA
Spectroscopic
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G230L
2376
STIS/CCD
Spectroscopic
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No
G430L
4300
STIS/CCD
Spectroscopic
No
No
G750L
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POS-TARG
DITHER
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LINE
false
false
3
90.0
STIS-ALONG-SLIT
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true
1
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Timing link suitability includes constraints ([16 After 01 by 78.0 to 80.0 days])
The scheduling data was generated by CASM 33.1.
CASM was run in Phase II mode.
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true
1
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Timing link suitability includes constraints ([17 After 01 by 82.0 to 84.0 days])
The scheduling data was generated by CASM 33.1.
CASM was run in Phase II mode.
(Tic-Visit
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true
1
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Timing link suitability includes constraints ([18 After 01 by 86.0 to 88.0 days])
The scheduling data was generated by CASM 33.1.
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(Tic-Visit
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true
1
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Timing link suitability includes constraints ([19 After 01 by 90.0 to 92.0 days])
The scheduling data was generated by CASM 33.1.
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1
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Timing link suitability includes constraints ([20 After 01 by 94.0 to 96.0 days])
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true
1
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Timing link suitability includes constraints ([21 After 01 by 98.0 to 100.0 days])
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true
1
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Timing link suitability includes constraints ([22 After 01 by 102.0 to 104.0 days])
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1
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Timing link suitability includes constraints ([24 After 01 by 111.0 to 113.0 days])
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Timing link suitability includes constraints ([25 After 01 by 132.0 to 134.0 days])
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true
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true
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:pcs-time 380
:si-vis-utilization 2523
:al-overhead-at-end 0
:internal-dur-at-end 640
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2907
:pcs-gap 0
)
true
1
0