Mass Segregation in the CMZoom Survey

Abstract

We employ a Minimum Spanning Tree (MST) approach to characterize the spatial distribution and mass segregation of compact millimeter continuum sources within the Central Molecular Zone (CMZ) of the Milky Way. We use a modified form of the complete version of the 1.3 mm dust continuum catalog from the CMZoom survey, which identifies 685 compact sources with typical effective radii of $\sim 0.1$ pc. For 22 of 35 CMZ clouds, we calculate the thermal and turbulent Jeans lengths and masses, and determine that compact source separations, as well as compact source masses, are more consistent with thermal fragmentation at $\sim 0.1$ pc size scales. We construct the mass segregation ratios for compact sources in 17 CMZ clouds and determine that 5 of the analyzed clouds display some form of mass segregation (${\Lambda }_{MSR}>1.5$), while the remaining clouds show either inverse mass segregation (${\Lambda }_{MSR}<0.75$), or no evidence of true mass segregation ($0.75<{\Lambda }_{MSR}<1.5$). Finally, we find that although some actively star-forming clouds do exhibit mass segregation, other similarly active clouds do not, indicating an unclear correlation with evolutionary stage for star forming clouds in the CMZ, given the current available data.

18 pages, 7 figures, 3 tables

References in corpus (43)

• Control of star formation by supersonic turbulence
• A geometric distance measurement to the Galactic Center black hole with 0.3% uncertainty
• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• Hierarchical fragmentation and differential star formation in the Galactic "Snake": infrared dark cloud G11.11-0.12
• Dense gas in the Galactic central molecular zone is warm and heated by turbulence
• Using the minimum spanning tree to trace mass segregation
• The ALMA Survey of 70 $\mu$m dark High-mass clumps in Early Stages (ASHES). I. Pilot Survey: Clump Fragmentation
• The link between turbulence, magnetic fields, filaments, and star formation in the Central Molecular Zone cloud G0.253+0.016
• Star formation rates and efficiencies in the Galactic Centre
• Characterizing Precursors to Stellar Clusters with Herschel
• The linewidth-size relationship in the dense ISM of the Central Molecular Zone
• The Galactic Center Molecular Cloud Survey. I. A Steep Linewidth-Size Relation & Suppression of Star Formation
• Distributed star formation throughout the Galactic Center cloud Sgr B2
• The dynamical evolution of molecular clouds near the Galactic Centre - II. Spatial structure and kinematics of simulated clouds
• Recent star formation in the inner Galactic Bulge seen by ISOGAL II -- The Central Molecular Zone
• Structure and mass segregation in Galactic stellar clusters
• Detection of Widespread Hot Ammonia in the Galactic Center
• The ALMA Survey of 70 $\mu$m Dark High-mass Clumps in Early Stages (ASHES). IX. Physical Properties and Spatial Distribution of Cores in IRDCs
• Star formation activity and the spatial distribution and mass segregation of dense cores in the early phases of star formation
• Global mass segregation in hydrodynamical simulations of star formation
• Hierarchical fragmentation in the Perseus molecular cloud: From the cloud scale to protostellar objects
• Galactic structure based on the ATLASGAL 870mum survey
• Comparisons between different techniques for measuring mass segregation
• CMZoom: Survey Overview and First Data Release
• Abundant Methanol Masers but no New Evidence for Star Formation in GCM0.253+0.016
• The Dense Gas Fraction in Galactic Center Clouds
• Star formation in a high-pressure environment: An SMA view of the Galactic centre dust ridge
• ALMA Observations of Massive Clouds in the Central Molecular Zone: Jeans Fragmentation and Cluster Formation
• A Census of Early Phase High-Mass Star Formation in the Central Molecular Zone
• Spectral imaging of the Central Molecular Zone in multiple 7-mm molecular lines
• The Galactic Center Molecular Cloud Survey. II. A Lack of Dense Gas & Cloud Evolution along Galactic Center Orbits
• ALMA-IMF VI -- Investigating the origin of stellar masses: Core mass function evolution in the W43-MM2&MM3 mini-starburst
• Do star clusters form in a completely mass-segregated way?
• The geometry of the magnetic field in the Central Molecular Zone measured by PILOT
• Young massive star cluster formation in the Galactic Centre is driven by global gravitational collapse of high-mass molecular clouds
• Star formation in 'the Brick': ALMA reveals an active proto-cluster in the Galactic centre cloud G0.253+0.016
• Mass segregation and sequential star formation in NGC 2264 revealed by Herschel
• HII regions and high-mass starless clump candidates II. Fragmentation and induced star formation at ~0.025 pc scale: An ALMA continuum study
• On the spatial distributions of dense cores in Orion B
• CMZoom II: Catalog of Compact Submillimeter Dust Continuum Sources in the Milky Way's Central Molecular Zone
• On the mass segregation of cores and stars
• Molecular Gas in the Galactic Center Region II. Gas mass and N(H_2)/I(^12CO) conversion based on a C^18O(J = 1 -> 0) Survey
• CMZoom III: Spectral Line Data Release