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The ALMA view of the Antennae galaxy collision: How galaxy interaction triggers the formation of super star clusters

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Cinthya N. Herrera ,
François Boulanger ,
Edith G. Falgarone ,
Guillaume Pineau des Forêts ,
Santiago García-Burillo ,
Daisuke Iono  and
Pierre Guillard
Cinthya N. Herrera
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Japan email: diono@nao.ac.jp
François Boulanger
Affiliation:
Institut d'Astrophyisque Spatiale Université Paris Sud, Batiment 121, 91405 Orsay, France email: francois.boulanger@ias.u-psud.fr, guillaume.pineaudesforets@ias.u-psud.fr
Edith G. Falgarone
Affiliation:
Ecole Normale Superieure, LERMA 24 rue Lhomond, 75231 Paris, France email: edith.falgarone@ens.fr
Guillaume Pineau des Forêts
Affiliation:
Institut d'Astrophyisque Spatiale Université Paris Sud, Batiment 121, 91405 Orsay, France email: francois.boulanger@ias.u-psud.fr, guillaume.pineaudesforets@ias.u-psud.fr
Santiago García-Burillo
Affiliation:
Observatorio Astronómico Nacional Aptdo 1143, 28800 Alcalá de Henares, Spain email: burillo@oan.es
Daisuke Iono
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Japan email: diono@nao.ac.jp
Pierre Guillard
Affiliation:
Sorbonne Universités, UPMC Univ Paris 6 et CNRS, UMR 7095, Institut d'Astrophysique de Paris 98 bis bd Arago, 75014 Paris, France email: guillard@iap.fr
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Abstract

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The Antennae galaxies are a spectacular example of a burst of star formation triggered by the encounter of two galaxies, being an ideal source to understand how the dynamics of galaxy mergers drives star formation. We present archive ALMA CO(3−2) and VLT near-IR H2 spectro-imaging observations, and new ALMA 13CO(2−1) and dust continuum observations, at ~50 pc resolution. Combining tracers of density and velocity structure of the gas and its energetics, we demonstrate that star formation involves a complex interplay of merger-driven gas dynamics and turbulence, and the dissipation of the gas kinetic energy. We focus on a compact, bright H2 source, associated with cold molecular gas and dust continuum emission, located where the velocity gradient in the interaction region is observed to be the largest. The characteristics of this source suggest that we are witnessing the formation, initiated by turbulent dissipation, of a cloud massive enough (~4×106M⊙) to form a super star cluster within 1 Myr.

Keywords

ISM; galaxies: starburstsinteractionstar clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , pp. 138 - 141
Copyright
Copyright © International Astronomical Union 2016 

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