ALMA-IMF Core Working Group, January 14 2021

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

Attendees: Fred, Fabien, Yohan, Sasha, Nathalie, Mélanie, Fabrice, Gemma, Adam, Leo, Sylvain, Amy, Allison, Patricio, Nichol, Timea
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: call

→ We need someone to make Dendrogram tests (maybe Roberto & student?)

1. CMF results on the whole ALMA-IMF sample

• Fabien’s experience using the Cleanest images of Dec 2020 ⇒ less sources
  

Global CMF: flatter than Salpeter, independently from their evolutionary stage (at 0 order), generic bias of slope due to projection effect = 0.15 to be taken into account

Automatic removal of (0% in young, 10% in intermediate, ¼ in evolved regions) cores potentially contaminated by free-free emission using 3mm/1mm ratio maps and the recombination line images of Roberto
⇒ Evolutionary stage of regions to be refined (see Fig. 20 of Adam’s paper): G353 and G08 → Intermediate, G12 → Evolved, G337 → Young
⇒ The CMF becomes slightly steeper for evolved regions when removing cores lying in the free-free (H41alpha footprint for now) areas.
Young: G327, G328, G337, G338, W43-MM1, W43-MM2 (no Halpha)
Intermediate: W43-MM3, G351, G353, G008, W51-E (most cores on thermal dust emission)
Evolved: W51-IRS2, G010, G012, G333

The major uncertainty is now coming from the dust temperature, here assumed to be constant over the whole core sample. 
→ Test to be done on W51 using NH3 temperature (Adam + Fabien)

Optical thickness to be investigated, using e.g. the approximated formula of our Nature Astronomy paper.

• Detailed experience of Yohan on W43-MM2&MM3
  

Need of rescaling the 3mm flux, use a rms value (2sigma for getsf catalogs) for the 
weak 3mm sources (TBD by Fabien)
    Few sources (2-3) could be free-free in MM3
   

• Future CMF studies
  

    Mélanie: G12 (70 sources in cleanest image, most outside the HII region area)
Gemma: W51-E
Hongli G353.41 (CMF, fragmentation)
Xing G327
    Nichol+Jeff?: on the denoised images by MnGSeg 

1.  Nature of cores: Outflows? Hot cores?

Outflow catalogs will need deep-extraction catalogs to make the association of outflow lobes and lower-mass cores.
To be discussed in 2 weeks.

1. Core temperature: News with PPMAP? NH3 fits? 

To be discussed in 2 weeks.