25 October 2012, 15:00 CEST
Chairs: Roland Vavrek and Elena Puga (HSC)
25 Oct 2012, 15:00 CEST, B83

On the call: Domingo Anibal García Hernandez, Johan Lindberg, Roland Vavrek, Elena Puga, Max Avruch, Bruno Altieri, Greg Herczeg, Colin Borys, Daizhong Liu, Jean Matagne, Michael Olberg, Okada, Paul Harvey, Silke Andree, Velusamy, Wanggi, Kevin Croxal, Miguel Sanchez-Portal, Aprajita, Bruno Merín, Call-in-user-4, Dominique et Cecilia, Bea Gonzalez, Call-in-user-5, Milena Benedettini, Joanna Oliveira, Ke Wang, Vianney Leboutellier
(29 total, 19 external, 18 at the end)

Presentation




Webinar video




Questions & Answers


Q: Where can I check whether my observations suffered from strong pointing offsets?
A: Check by OD number at http://herschel.esac.esa.int/twiki/bin/view/Public/HowToUseImprovedPointingProducts.

Q- MAx Avruch: what is a bright source?
A: approx. 50 Jy

Q-Greg: for fainter sources, is there a calibration strategy?
A: you should use both the calBlock and telescope normalization pipelines but there is a limit on what you can do with them. The telescope normalization pipeline should work better for those cases.
A-Miguel Sanchez-Portal: Regarding the figure with the pointing jitter, the 1-sigma dispersion in this figure even for the green curve, it is also inside the requirements, which are 1.5 arc sec.

Q-Greg: in a recent paper we found that we could correct for the continuum warping with some error, taking it down to 30%. However, it was not worth it the effort. Herzceg et al. 2012 (March). The PSF is much larger at 150 microns that at shorter wavelengths.
A: if you could give us the code we might want to incorporate it as a plugin or in any other way.

Q-Max Avruch: the test obsid, 1342188943 is a cal obs, and therefore not public
A: we will make them public very soon and you can ask the help desk to get it and you will get it immediately.

Q-Bruno Merín: you are not supposed to use this on faint sources, how much faint?
A-Roland: anything beyond 5-sigma from the continuum is good, for lower values the tool might not work or even make things worse.

Q-Paul Harvey: about mapping, I am using PACS range-scan, the browse product has a map of 3 arc-sec resolution and I would like to know how to create that and whether or not it is useful. I cannot find anywhere in the ChopNod i-pipe where to set the pixel size. It is
A: section 3.7.2 of the PACS PDRG

Q-Greg Herzceg: Jeroen Bouwman has developed a tool to correct fluxes for pointing offsets by correcting for sources falling in-between the spaxels.. any comment on that?
A-Roland: this tool is still in development. we have anyway this parallel work on the gyro propagation information which might allow. Maybe for HIPE 11.

Q-Johan Lindberg: what is the gyro correction about? IS there any information to read about this somewhere?
A-Elena: it would be the most general correction, it is already producing the most promising results. We are just lacking the tool to use in HIPE.
A-Roland: this method relays on extracting information from the ACMS system in the spacecraft, and this will produce a new pointing product that will be distributed. So no real documentation available on this yet.

Webinar contents


  1. General description of PACS spectroscopy flux calibration concept (calBlocks and telescope normalization) [demo and presentation]
  2. PACS spectroscopy point-source flux extraction: 3x3 mispointing correction. [presentation and demo]
  3. Questions and Answers