Candidate super star cluster progenitor gas clouds possibly triggered by close passage to Sgr A*
MetadataShow full item record
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. ©: 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved
Super star clusters are the end product of star formation under the most extreme conditions. As such, studying how their final stellar populations are assembled from their natal progenitor gas clouds can provide strong constraints on star formation theories. An obvious place to look for the initial conditions of such extreme stellar clusters is gas clouds of comparable mass and density, with no star formation activity. We present a method to identify such progenitor gas clouds and demonstrate the technique for the gas in the inner few hundred pc of our Galaxy. The method highlights three clouds in the region with similar global physical properties to the previously identified extreme cloud, G0.253 + 0.016, as potential young massive cluster (YMC) precursors. The fact that four potential YMC progenitor clouds have been identified in the inner 100 pc of the Galaxy, but no clouds with similar properties have been found in the whole first quadrant despite extensive observational efforts, has implications for cluster formation/destruction rates across the Galaxy. We put forward a scenario to explain how such dense gas clouds can arise in the Galactic Centre environment, in which YMC formation is triggered by gas streams passing close to the minimum of the global Galactic gravitational potential at the location of the central supermassive black hole, Sgr A*. If this triggering mechanism can be verified, we can use the known time interval since closest approach to Sgr A* to study the physics of stellar mass assembly in an extreme environment as a function of absolute time.
Showing items related by title, author, creator and subject.
Smith, B.; Soria, Roberto; Struck, C.; Giroux, M.; Swartz, D.; Yukita, M. (2014)Hinge clumps are luminous knots of star formation near the base of tidal features in some interacting galaxies. We use archival Hubble Space Telescope (HST) UV/optical/IR images and Chandra X-ray maps along with Galaxy ...
Longmore, S.; Bally, J.; Testi, L.; Purcell, C.; Walsh, Andrew; Bressert, E.; Pestalozzi, M.; Molinari, S.; Ott, J.; Cortese, L.; Battersby, C.; Murray, N.; Lee, E.; Kruijssen, J.; Schisano, E.; Elia, D. (2013)The conversion of gas into stars is a fundamental process in astrophysics and cosmology. Stars are known to form from the gravitational collapse of dense clumps in interstellar molecular clouds, and it has been proposed ...
Longmore, S.; Rathborne, J.; Bastian, N.; Alves, J.; Ascenso, J.; Bally, J.; Testi, L.; Longmore, A.; Battersby, C.; Bressert, E.; Purcell, C.; Walsh, Andrew; Jackson, J.; Foster, J.; Molinari, S.; Meingast, S.; Amorim, A.; Lima, J.; Marques, R.; Moitinho, A.; Pinhao, J.; Rebordao, J.; Santos, F. (2012)Young massive clusters (YMCs) with stellar masses of 104–105M and core stellar densities of 104–105 stars per cubic pc are thought to be the “missing link” between open clusters and extreme extragalactic super star clusters ...