Cloud-cloud collisions in the common foot point of molecular loops 1 and 2 in the Galactic Center
arXiv:1910.03308 · doi:10.1093/pasj/psz119
Abstract
Recent large-area, deep CO surveys in the Galactic disk have revealed the formation of ~50 high-mass stars or clusters triggered by cloud-cloud collisions (CCCs). Although the Galactic Center (GC) -- which contains the highest volume density of molecular gas -- is the most favorable place for cloud collisions, systematic studies of CCCs in that region are still untouched. Here we report for the first time evidence of CCCs in the common foot point of molecular loops 1 and 2 in the GC. We have investigated the distribution of molecular gas toward the foot point by using a methodology for identifying CCCs, and we have discovered clear signatures of CCCs. Using the estimated displacements and relative velocities of the clouds, we find the elapsed time since the beginnings of the collisions to be 105-6 yr. We consider possible origins for previously reported peculiar velocity features in the foot point and discuss star formation triggered by CCCs in the GC.
27 pages, 11 figures, 2 tables, accepted PASJ
References in corpus (25)
- Do cloud-cloud collisions trigger high-mass star formation? I. Small cloud collisions
- Molecular clouds towards RCW 49 and Westerlund 2; Evidence for cluster formation triggered by cloud-cloud collision
- The frequency and nature of `cloud-cloud collisions' in galaxies
- Cloud-cloud collision as a trigger of the high-mass star formation; a molecular line study in RCW120
- The proper motion of the Arches cluster with Keck Laser-Guide Star Adaptive Optics
- Complex, Quiescent Kinematics in a Highly Filamentary Infrared Dark Cloud
- Cluster Formation Triggered by Filament Collisions in Serpens South
- Indication of Another Intermediate-mass Black Hole in the Galactic Center
- Multi-wavelength study of the star-formation in the S237 H II region
- Colliding Filaments and a Massive Dense Core in the Cygnus OB 7 Molecular Cloud
- L1188: a promising candidate of cloud-cloud collision triggering the formation of the low- and intermediate-mass stars
- High-mass star formation possibly triggered by cloud-cloud collision in the HII region RCW 34
- FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45-m telescope (FUGIN) : Molecular clouds toward W33 ; possible evidence for a cloud-cloud collision triggering O star formation
- Cloud-cloud collision in the DR 21 cloud as a trigger of massive star formation
- Formation of the young compact cluster GM 24 triggered by a cloud-cloud collision
- ALMA view of G0.253+0.016: Can cloud-cloud collision form the cloud?
- Observational signatures of cloud-cloud collision in the extended star-forming region S235
- New Insights into the Physical Conditions and Internal Structure of a Candidate Proto-Globular Cluster
- Star formation around mid-infrared bubble N37: Evidence of cloud-cloud collision
- New insights in the mid-infrared bubble N49 site: a clue of collision of filamentary molecular clouds
- Star Formation Activity in the molecular cloud G35.200.74: onset of cloud-cloud collision
- A Multi-wavelength Study of the Massive Star-forming Region S87
- Colliding Clouds: The Star Formation Trigger of the Stellar Cluster Around BD+40 4124
- Unveiling molecular clouds toward bipolar HII region G8.14+0.23
- Evidence of interacting elongated filaments in the star-forming site AFGL 5142
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- FOREST unbiased Galactic plane imaging survey with the Nobeyama 45 m telescope (FUGIN): Possible evidence of cloud-cloud collisions triggering high-mass star formation in the giant molecular cloud M16 (Eagle Nebula)
- Massive core/star formation triggered by cloud-cloud collision: II High-speed collisions of magnetized clouds
- ALMA Observations of Giant Molecular Clouds in M33 III: Spatially Resolved Features of the Star-Formation Inactive Million-solar-mass Cloud
- Cloud-cloud collisions triggering star formation in galaxy simulations
- Giant molecular clouds and their Type classification in M74: Toward understanding star formation and cloud evolution
- HCN =4-3, HNC =1-0, =1-0, and =10-9 Maps of Galactic Center Region II.: Physical Properties of Dense Gas Clumps and Probability of Star Formation
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- Properties of star formation of the Large Magellanic Cloud as probed by young stellar objects
- Triggered high-mass star formation in the HII region W28A2: A cloud-cloud collision scenario
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