ALMA-IMF Core Working Group, December 17 2020

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

Attendees: Fred, Fabien, Antoine, Sasha, Adam, Nathalie, Amy, Tapas, Sylvain, Leo, Yohan, Thomas, Jeff, Pierre, Mélisse, Mélanie, Allison, HongLi, Fabrice
Not attending: 

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


Agenda:

1. Core extraction softwares: tests on benchmarks using MnGseg or not → Yohan, Fabien, Sylvain, Sasha

When the SNR of core detection decreases the ratio of measured size /true size and measured flux /true flux disperse around the value of 1 → mass estimates are less accurate.
Noise: white noise before simobserve + weather noise in simobserve
Integration time, distance, configuration were supposed to be representing ALMA-IMF images.
→ Dendrogram tests must still be correctly done
→ Comparison of getsf versus Gext2D: good correspondence except for lower-intensity sources

1. CMF results on the whole ALMA-IMF sample → Fabien

Slightly less sources than in the 1st extraction (Jan 2020)
There is no more evolution of the CMF slope → index = 0.73-0.77 whatever the evolutionary stage of the region, flatter than the slope measure on the IRDC CMF by Patricio.
We now need to take into account free-free sources → removing cores using potential free-free emission (To Be improved), the index all regions gets steeper, and the evolved region close to  = 1.4, the Salpeter index. 

1.  Outflows arising from cores in W43-MM2→ Thomas

Outflow catalogs will need deep-extraction catalogs to make the association of outflow lobes and lower-mass cores.

1. PPMAP and Herbie → Pierre Dell’Ova

• PPMAP (Marsh+2015)
  

His experience on SNR IC443G images (NIKA2 1-2 mm, LABOCA 870micron, MIPS 160 micron)
Inputs: Data and beam fits for each wavelength + beta and Tdust grids + color correction + “a priori dilution” (1 to 10, effect on Tmap)
Adding 70 micron and even worse 24 micron does not help modelize the SED of the big-grain submm component. Opacity at 70 micron was taken into account (empirical correction) by Ken for the Tdust image of W43-MM1.

• Herbie (Galliano+2018)
  

Contains a grain model (THEMIS) but it will require to smooth all data to the worse resolution. It could give information on the dust emissivity and G0 of the global environment, smoothed to 20-40’’. 

None of these models include free-free emission...