Molecular cloud cores in the GC 50km/s cloud Virtual Observatory Resource

Authors
  1. Uehara K.
  2. Tsuboi M.
  3. Kitamura Y.
  4. Miyawaki R.
  5. Miyazaki A.
  6. Published by
    CDS
Abstract

The Galactic center 50km/s molecular cloud (50MC) is the most remarkable molecular cloud in the Sagittarius A region. This cloud is a candidate for the massive star formation induced by cloud-cloud collision (CCC) with a collision velocity of ~30km/s that is estimated from the velocity dispersion. We observed the whole of the 50MC with a high angular resolution (~2.0"x1.4") in Atacama Large Millimeter/submillimeter Array cycle 1 in the H^13^CO^+^ J=1-0 and C^34^S J=2-1 emission lines. We identified 241 and 129 bound cores with a virial parameter of less than 2, which are thought to be gravitationally bound, in the H^13^CO^+^ and C^34^S maps using the clumpfind algorithm, respectively. In the CCC region, the bound H^13^CO^+^ and C^34^S cores are 119 and 82, whose masses are 68% and 76% of those in the whole 50MC, respectively. The distribution of the core number and column densities in the CCC are biased to larger densities than those in the non-CCC region. The distributions indicate that the CCC compresses the molecular gas and increases the number of the dense bound cores. Additionally, the massive bound cores with masses of >3000M_{sun}_ exist only in the CCC region, although the slope of the core mass function (CMF) in the CCC region is not different from that in the non-CCC region. We conclude that the compression by the CCC efficiently formed massive bound cores even if the slope of the CMF is not changed so much by the CCC.

Keywords
  1. molecular-clouds
  2. galactic-center
  3. interstellar-medium
  4. interferometry
  5. radio-astronomy
Bibliographic source Bibcode
2019ApJ...872..121U
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IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/872/121
Document Object Identifer DOI
doi:10.26093/cds/vizier.18720121

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History

2020-08-27T08:16:43Z
Resource record created
2020-08-27T08:16:43Z
Created
2020-11-26T11:33:31Z
Updated

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