ALMA-IMF Core Working Group, November 5 2020

Connection:
https://univ-grenoble-alpes-fr.zoom.us/j/98634272360?pwd=YkQ1ZVM5K2l4UUFPTkViYVNZRDFXZz09

Attendees: Fred, Sasha, Nathalie, Yohan, Hongli, Mélanie, Ant, Fabien, Fabrice, Adam, Alex, Alison, Antoine, Jeff, Thomas, Patricio, Tapas, Timea
Not attending: Gemma

For memory:
Minutes from our last telecon
Activities of the Core Working Group
Members and their main interests


Agenda:

1. News on core extraction by Yohan, Fabien and Mélanie

• Presentation by Mélanie on W33

82 catalogues, 25K assumed, post-selection needed
Preliminary CMF: powerlaw fit? with -1 instead of 1.35 (Salpeter)
Tdust images: PPMAP with validation by modelling of a few sources with Hyperion

→ Hyperion code could be used for the SED fit of 1/ the whole ALMA-IMF fields, when no published luminosity exists (done for W43-MM2) and 2/ some specific cores in our ALMA-IMF fields 

Other people interested to make similar work: 
- Fabrice
- Theo Richardson’s project (PhD with Adam): expanding Robitaille 2017 grid, connecting it with protostellar evolution models

• Core catalogs
  

Catalogs done with getsf → catalogs to be investigated
With Getx2D, significance still need to be investigated before catalogs are made
Nothing done for Dendrogram yet
→ Benchmark images to be used
→ Need to contact Erik for Dendrograms

1. Temperature estimates with PPMAP

• The PPMAP procedure 
  

Default run:

• with ALMA B6 and B3 + Herschel 70, 160, 250 micron + SABOCA 350 micron + LABOCA 870 micron
  
• with 60’’-filtered images
  
• using a ‘tight noise’ weighting of the SED fit.
  

Several runs: 

• the Herschel-only run → to be used
  
• ALMA, no filtering → issue with the edges of ALMA images (too high temperatures)
  
• ALMA B6 + NOEMA 3mm (equiv 7M ALMA B3) instead ALMA B3 (bad fit close to the HII region + more NANs) no filtering → same, issue with the edges of ALMA images (too high temperatures)
  
• ALMA B6 + NOEMA 3mm with filtering → resembles the run with B3, B6 edges are causing problems
  
• Default run with optical depth corrections soon
  

Questions

• Could we fit SEDs on each pixel just dropping the negative flux?
  
• A combination of the 2 resulting images… 
  

PPMAP experts:
→ Ken Marsh (IPAC) and Alex Howard (in a company from Monday on)
→ Matt Smith from Cardiff (extragalactic focus)
→ Ana XX (SNR astronomer)
→ Hands-on? Interested people: 
From France: Fabrice Herpin, Fred, Yohan, Antoine, Mélanie?, 
From US: Allison Towner, Adam
From Mexico: Thomas?

• Jeff’s evaluation of the filtering scales of the datasets used by PPMAP 
  

Jeff’s presentation from 4 weeks ago.
Not discussed today...

1. Other estimations of the core temperature

Not discussed today

• Status of Brian’s efforts to analyze and collect ammonia data
  

• Fred and Nathalie should soon present the proxy proposed for the protostellar luminosity of continuum cores, using the “line contamination” of “the continuum band” by COMs lines.