Protostellar cores in Sagittarius B2 N and M: continuum data

<p>This is a set of self-calibrated continuum FITS files for the&nbsp;ALMA Cycle 4 project 2016.1.00550.S. The paper &quot;Protostellar cores in Sagittarius B2 N and M&quot; was&nbsp;accepted to ApJ on September 15, 2023.&nbsp;</p> <p>Paper abstract:</p> <p>We present 500 AU and 700 AU resolution 1 mm and 3 mm ALMA observations, respectively, of protostellar cores in protoclusters Sagittarius B2 (Sgr B2) North (N) and Main (M), parts of the most actively star-forming cloud in our Galaxy. Previous lower resolution (5000 AU) 3 mm observations of this region detected <span class="math-tex">\(\sim\)</span>150 sources inferred to be young stellar objects (YSOs) with <span class="math-tex">\(M&gt;8\mathrm{\,M}_\odot\)</span>. With a tenfold increase in resolution, we detect 371 sources at 3 mm and 218 sources in the smaller field of view at 1 mm.&nbsp;The sources seen at low resolution are observed to fragment into an average of two objects. About a third of the observed sources fragment.Most of the sources we report are marginally resolved and are at least partially optically thick.&nbsp;We determine that the observed sources are most consistent with Stage 0/I YSOs, i.e., rotationally supported disks with an active protostar and an envelope, that are warmer than those observed in the solar neighborhood.We report source-counting-based inferred stellar mass and the star formation rate of the cloud: <span class="math-tex">\(2800\mathrm{\,M}_\odot\)</span>, <span class="math-tex">\(0.0038\mathrm{\,M}_\odot \mathrm{yr}^{-1}\)</span> for Sgr B2 N and <span class="math-tex">\(6900\mathrm{\,M}_\odot, 0.0093\mathrm{\,M}_\odot \mathrm{yr}^{-1}\)</span> for Sgr B2 M respectively.&nbsp;</p>