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AGENDA
Monday afternoon:
- 2pm: Welcome and organisation of the week (Pop/Giorgio)
- 3pm: (remote) presentation by David and Dominik about their last results about warm corona
- 3-4pm (including discussion): David talk. pdf can be found here.
- 4-5pm (including discussion): Dominik talk. pdf can be found here
- 5pm: general discussion. Preparation of the next days.
Tuesday:
Morning: Working session
Afternoon: plenary discussion
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Summary of the work done so far
Search of sources without soft X-ray excess (Ricardo/Francesco)
They have a look to the CAIXA sample. One candidate so far (Mkn 728). Work in progress
Objects of the Fernández-Ontiveros & Muñoz-Darias paper with large Lyman Hardness could be good candidates
warm corona stability/instability
Can it explain the QPE? The sources are showing changes between disk dominated and soft comptonization dominated states. Comptonized state is observed during the outburst. From Bozena estimates, those periodical events CANNOT be explained by the viscous time scales. But may be explained by thermal scales,.
first fit with TITAN code (Samuel)
The report can be found here
Samuel fit one obs of NGC 7469 and one obs of Mkn 509 with the TITAN table produced by Dominik.
Fits OK with (qh,tau) values in agreement with the expectations from Petrucci et al. (2020)
However, when computi,ng the contour plots, xspec found a much better solution for qh~1e-23 and tau of a few. The TITAN-NOAR spectrum looks however very noisy. The fit is better becaue it can fit lines presnet in the soft X-ray band. These lines may not be real and are only due to low statistics of NOAR simulations
To do list
relaunch a TITAN table with higher statistics to see if the "lines" present at low qh are real.: Action Dominik
compute the thermal timescale for the model developped by dominik: Action Dominik
have a look to the sample of Fernández-Ontiveros & Muñoz-Darias to find AGN without soft X-ray excess: Action Francesco/Riccardo
continue data fitting. Action: Samuel
For NGC 7469 and Mkn 509 include the absorption/emission tables produced by Jelle Kaastra: Action Riccardo/Francesco
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Wednesday:
Morning: Working session
Afternoon: plenary discussion
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Summary of the work done so far
Warm corona on the timing properties of AGN (Barbara)
The presentation by Barbara is here
Barbara shows different interesting axis of research. Perhaps the "easiest" one would be to have a look at the rms spectrum at low and high frequency and see how they look like and if the soft X-ray excess behave differently than e.g. the hard X-rays: Action: Barbara. But need a good data set (e.g. IRAS 13224-3809, H0707)
Search of sources without soft X-ray excess (Ricardo/Francesco)
They have a look to the sample of the Fernández-Ontiveros & Muñoz-Darias paper with large Lyman Hardness and high lumnosity. A few candidates without soft X-ray excess. Summary here.
SB remarks that instead of looking for object that may not have soft X-ray excess (but this can be due to stat) would be better to study the SE strenght with respect to other objects caracteristics, for example the UV.
The sample of Petrucci et al. 2018 could be a good start. Action: Pop, Riccardo, Francesco
fit with TITAN code (Samuel)
Samuel keeps on fitting data with the TITAN table. Still problem with the low statistics spectra but mange to avoid divergence of the fit by adding emission lines in the soft band
Fits are OK with tau and qh quite similar from objects to objects. To be continued: Action: Samuel
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Thursday:
Morning: Working session
Afternoon: summary of the work done during the previous day and discuss future works.
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Summary of the work done so far
Radiation pressure instability (Bozena)
Summary of the work published in Sniegowska et al. (2020, https://ui.adsabs.harvard.edu/abs/2020A%26A...641A.167S/abstract) and in a recent paper in preparation
Look for UV/soft X-ray correlation from the Swift archive (Francesco/Riccardo)
The report can be find here
fit with TITAN code (Samuel)
The summary of fits done by Samuel can be found here
Future plans
Produce new TITAN tables with a better statistics: Action: Dominik
Keep on working on the UV/X analysis from the Swift Archive. Action: Francesco/Riccardo
Keep on working on the fits on the PICS data sample. Action: Samuel/Pop/David
It will be interesting to compare the warm corona constraints obtained with the ROSS and TITAN code
Test the impact of the lines in the TITAN vertical equilibrium. Action: Dominik/Agata/Renaud/Pop
are lines important in the part of the parameter space consitent with observations?
what about decreasing the number of lines in TITAN, keeping only a few among the strongest ones?
If the lines effect is negligeable than things can become much simpler (analytical?) and faster
Test the RMS spectra at different frequencies and for bright sources (e.g. IRAS 13224-3809, H0707). Action: Barbara
Work on the Athena’s A&A paper. Action: Francesco
Every body agree to participate to a 2nd ISSI meeting in one year from now (Sept.-Oct. 2022) with short zoom meetings in the meantime to discuss progresses
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Friday:
Morning: Working session
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