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Star formation in a high-pressure environment: An SMA view of the dust ridge

Published online by Cambridge University Press:  09 February 2017

Daniel L. Walker  and
CMZoom Survey Group (PIs: Eric Keto & Cara Battersby)
Daniel L. Walker
Affiliation:
Astrophysics Research Institute, Liverpool John Moores University, IC2, 146 Brownlow Hill, Liverpool, L3 5RFUnited Kingdom email: D.L.Walker@2009.ljmu.ac.uk Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA email: daniel.walker@cfa.harvard.edu CMZoom: https://www.cfa.harvard.edu/sma/LargeScale/CMZ
CMZoom Survey Group (PIs: Eric Keto & Cara Battersby)
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA email: daniel.walker@cfa.harvard.edu CMZoom: https://www.cfa.harvard.edu/sma/LargeScale/CMZ
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Abstract

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The star formation rate in the Central Molecular Zone is an order of magnitude lower than in the disk of the Galaxy, given the amount of dense gas there. Understanding why star formation is different in this region is crucial if we are to understand the environmental dependence of star formation. Here, we present the detection of high-mass cores in the CMZ’s ‘dust ridge’ that have been discovered with the Submillimeter Array. These cores range in mass from ~ 50 – 1800 M⊙ within radii of 0.1 – 0.25 pc. All are young (pre-UCHII), meaning that they are prime candidates for representing the initial conditions of high-mass stars and sub-clusters. We compare these with high-mass cores and clouds in the Galactic disk and find that they are very similar in terms of their masses and sizes, despite being subjected to external pressures that are several magnitudes greater (~ 108 K cm−3). The fact that > 80% of these cores do not show any signs of star-forming activity in such a high-pressure environment leads us to conclude that this is further evidence of the critical density for star formation being heightened in the CMZ due to turbulence.

Keywords

stars: formationISM: generalGalaxy: centersubmillimeter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S322: The Multi-Messenger Astrophysics of the Galactic Centre , July 2016 , pp. 95 - 98
Copyright
Copyright © International Astronomical Union 2017 

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