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G0.253+0.016: A centrally condensed, high-mass protocluster.

Universidad de Chile. Repositorio Académico

 
Título G0.253+0.016: A centrally condensed, high-mass protocluster.
 
Autor Foster, J. B.
Longmore, S. N.
Bastian, N.
Jackson, J. M.
Bally, J.
Kruijssen, J. M. D.
Contreras, Y.
Testi, L.
Bressert, E.
Rathborne, J. M.
Alves, J. F.
Garay Brignardello, Guido Alejandro
 
Tema dust, extinction
 
Descripción Artículo de publicación ISI.
Despite their importance as stellar nurseries and the building blocks of galaxies, very little is known about the formation of the highest mass clusters. The dense clump G0.253+0.016 represents an example of a clump that may form an Arches-like, high-mass cluster. Here we present molecular line maps toward G0.253+0.016 taken as part of the MALT90 molecular line survey, complemented with APEX observations. Combined, these data reveal the global physical properties and kinematics of G0.253+0.016. Recent Herschel data show that while the dust temperature is low (~19 K) toward its center, the dust temperature on the exterior is higher (~27 K) due to external heating. Our new molecular line data reveal that, overall, the morphology of dense gas detected toward G0.253+0.016 matches its IR extinction and dust continuum emission very well. An anticorrelation between the dust and gas column densities toward its center indicates that the clump is centrally condensed with a cold, dense interior in which the molecular gas is chemically depleted. The velocity field shows a strong gradient along the clump's major axis, with the blueshifted side at a higher Galactic longitude. The optically thick gas tracers are systematically redshifted with respect to the optically thin and hot gas tracers, indicating radial motions. The gas kinematics and line ratios support the recently proposed scenario in which G0.253+0.016 results from a tidal compression during a recent pericenter passage near Sgr A*. Because G0.253+0.016 represents an excellent example of a clump that may form a high-mass cluster, its detailed study should reveal a wealth of knowledge about the early stages of cluster formation.
 
Fecha 2014-09-16T13:28:26Z
2015-03-13T13:01:20Z
2014-09-16T13:28:26Z
2015-03-13T13:01:20Z
2014-04-25
 
Tipo Artículo de revista
 
Enlace The Astrophysical Journal, 786:140 (14pp), 2014 May 10
doi:10.1088/0004-637X/786/2/140
http://repositorio.uchile.cl/handle/2250/126475
 
Idioma en_US
 
Publicador The American Astronomical Society.