ALMAGAL Continuum Emission
The continuum emission at 1.3 mm of the 1013 clumps observed by the ALMAGAL survey revealed the complexity and the different morphologies that can characterize different high-mass star-forming regions. Some clumps show relatively extended emission that is mostly resolved at the 1000 au scale, in some fields the emission is distinctively filamentary, while in others can be extended with an irregular shape. On the contrary, other fields show little extended emission, with only compact sources. In this page we gave access to images preview of the ALMAGAL continuum emission for each source, together with the results of the analysis performed on this dataset.
Compact sources catalog
Coletta et al. 2025 (download here) analyzed the continuum emission of the ALMAGAL targets at a resolution of ~1000 au to extract the catalog of the compact sources. The analysis has been performed using the algorithm CuTEx, which identifies compact sources as maxima of curvature in maps by analyzing their second derivatives. This method allows an easier identification of compact sources, which stand out in the curvature images, while diffuse and background emission is strongly dampened.
The ALMAGAL compact sources catalog (available from CDS) includes 6348 cores detected in 844 clumps (83% of the total), with a number of cores per clump between 1 and 49 (median of 5). The estimated core diameters are mostly within ~800–3000 au (median of 1700 au). We assigned core temperatures based on the L/M of the hosting clump, and obtained core masses from 0.002 to 345 M⊙ (complete above 0.23 M⊙), exhibiting a good correlation with the core radii (M∝R2.6).
A preview of the continuum emission at 1000 au resolution for each ALMAGAL target, together with the results of the cores extraction on the target can be access at the link below. For each source, we report in green the ellipses that identify the compact cores, and we report in the top left corner the total number of cores detected. On the bottom of each image we give some of the properties of the source at clump level.
