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Firstly, a big thank you to everyone that has worked on updating and maintaining the astrodendro package; i found the tutorial to be very useful and informative at allowing me to understand what dendrograms are and how they can be utilised. Now, onto my questions:
Is it possible to calculate the correct flux from a 2D moment 0 (integrated emission) image of a molecular cloud? The units of the 2D image for BUNIT are in K*km/s. I am aware that when i try to do this, i get an error message stating that it isn't possible, due to these units not being implemented yet. However, i am just wondering whether a work around exists for this issue?
If I use 3D data (i.e. a PPV molecular line cube), this issue doesn't occur and the flux can be correctly calculated when BUNIT is equal to 'K' (thanks to the efforts of @tomr-stargazer !).
The issue with using a data cube (for now) is that it becomes slightly more challenging to choose the correct min_value, min_npix (this one in particular) and min_delta values; which isn't an issue that occurs with the 2D data. Perhaps @keflavich may have some ideas here for constraining min_npix in a data cube? The cloud I'm looking at is 'small' with the x and y dimensions of the image having an area that won't exceed 870" x 870" (29 x 29 pixels, with each pixel increment being 30 arc seconds).
The text was updated successfully, but these errors were encountered:
Could you post the traceback you get when using BUNIT = K km/s ? I don't remember exactly where that is, but it sounds like it might be an equivalency issue that may have been solved.
Hi there,
Firstly, a big thank you to everyone that has worked on updating and maintaining the astrodendro package; i found the tutorial to be very useful and informative at allowing me to understand what dendrograms are and how they can be utilised. Now, onto my questions:
Is it possible to calculate the correct flux from a 2D moment 0 (integrated emission) image of a molecular cloud? The units of the 2D image for
BUNIT
are in K*km/s. I am aware that when i try to do this, i get an error message stating that it isn't possible, due to these units not being implemented yet. However, i am just wondering whether a work around exists for this issue?If I use 3D data (i.e. a PPV molecular line cube), this issue doesn't occur and the flux can be correctly calculated when
BUNIT
is equal to 'K' (thanks to the efforts of @tomr-stargazer !).The issue with using a data cube (for now) is that it becomes slightly more challenging to choose the correct
min_value
,min_npix
(this one in particular) andmin_delta
values; which isn't an issue that occurs with the 2D data. Perhaps @keflavich may have some ideas here for constrainingmin_npix
in a data cube? The cloud I'm looking at is 'small' with the x and y dimensions of the image having an area that won't exceed 870" x 870" (29 x 29 pixels, with each pixel increment being 30 arc seconds).The text was updated successfully, but these errors were encountered: