...
2021-05-13 - WG meeting on zoom
...
2021 October 22nd Working group meeting
Held on Zoom
Attending (in alphabetical order): Sunil Chandra, Hannah Earnshaw, Karl Forster, Felix Fuerst, Elisabeth Jourdain, Jamie Kennea, Renee Ludlam, Kristin Madsen, Herman Marshall, Katja Pottschmidt, Pedro Rodriguez, Celia Sanchez, Maria Santos-Lleo, Norbert Schartel, Yukikatsu Terada, Josh Wing
There were four presentations made during the working group meeting sparking a lively and constructive conversation. The meeting began with a reminder about the calibration observation information posted on the working group google sheets (https://tinyurl.com/4z94r895).
Report on recent coordinated calibration observations:
1ES 0229+200
The observations were organized to investigate the possibility of using this blazar for future cross-calibration campaigns based on the report from Norbert Schartel and Felix Fuerst presented at the last working group meeting. Coordinated observations were performed between 2021-08-08 to 14 by the following observatories:
| Observatory | Exposure time (ks) | ...and at other wavelengths | ||
|---|---|---|---|---|
| Astrosat | 160 LAXPC (40 ks UVIT) | ATOM | BVRI | |
| NICER | 45.9 | Effelsberg 100m | 2cm and 14mm bands | |
| NuSTAR | 107+65+63 | H.E.S.S | TeV 10 ks/day | |
| Swift | 20 | MAGIC | 30 GeV - 100 TeV | |
| XMM-Newton | 122.6 | |||
Crab
Coordinated observation by INTEGRAL, XMM-Newton, and NuSTAR continue with the goal of refining the NuSTAR and XMM-pn calibration. Observations coordinated with the IXPE schedule (currently 2022-02-21) are also planned.
3C 273
The annual multi-mission cross-calibration campaign will continue in 2022. Note that an IXPE observation is currently planned for 2022-06-16.
- Kristin Madsen presented the analysis by Corin Marasco of the XMM-Newton, Chandra, NuSTAR, and Swift observations of 3C 273 that have been performed annually since 2015.
- This is an extension of the work presented in Madsen et al. (2017) AJ 153, 2 https://iopscience.iop.org/article/10.3847/1538-3881/153/1/2
- Joint fitting of the spectra from pairs of observations with matching Good Time Intervals were examined in bands:
- 3-7 keV for NuSTAR + Chandra/Swift/XMM-Newton pairs
- 1-5 keV for Chandra/Swift/XMM-Newton pairs
- Absorbed power-law model (zpow*cflux*tbabs) used to examine the measured flux relative to the model flux
- Example for 2017 observations:
 |
Model parameters from the 2017 observations
|
 |
Cross normalization constants from the pairs of observations are shown on the left. Note:
|
 |
- Communication with the Chandra team is underway to check the Chandra analysis
- The NuSTAR analysis will be redone with the updated calibration released this month (2021 October)
- NICER observations will also be folded into the analysis (Renee Ludlam)
- Analysis will be extended to evaluate within the concordance framework (arXiv)
- Flux ratio examined in narrow energy bands - model independent
- There is some complexity to the XMM spectrum - Felix Fuerst
- with correlated residuals between instruments
- Work is continuing and will include the 2021 XMM-Newton observations as well as the NICER observations.
...
2021 May 13th Working group meeting
...