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Molecular clouds toward the super star cluster NGC 3603; possible evidence for a cloud-cloud collision in triggering the cluster formation

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posted on 2023-05-18, 07:39 authored by Fukui, Y, Ohama, A, Hanaoka, N, Furukawa, N, Torii, K, Joanne Dawson, Mizuno, N, Hasegawa, K, Fukuda, T, Soga, S, Moribe, N, Kuroda, Y, Hayakawa, T, Kawamura, A, Kuwahara, T, Yamamoto, H, Okuda, T, Onishi, T, Maezawa, H, Mizuno, A
We present new large field observations of molecular clouds with NANTEN2 toward the super star cluster NGC 3603 in the transitions 12CO(J = 2-1,J = 1-0) and 13CO(J = 2-1, J = 1-0). We suggest that two molecular clouds at 13 km s-1 and 28 km s-1 are associated with NGC 3603 as evidenced by higher temperatures toward the H II region, as well as morphological correspondence. The mass of the clouds is too small to gravitationally bind them, given their relative motion of ~20 km s-1. We suggest that the two clouds collided with each other 1 Myr ago to trigger the formation of the super star cluster. This scenario is able to explain the origin of the highest mass stellar population in the cluster, which is as young as 1 Myr and is segregated within the central sub-pc of the cluster. This is the second super star cluster along with Westerlund 2 where formation may have been triggered by a cloud-cloud collision.

History

Publication title

Astrophysical Journal

Volume

780

Article number

36

Number

36

Pagination

1-13

ISSN

0004-637X

Department/School

School of Natural Sciences

Publisher

Institute of Physics Publishing

Place of publication

1427 E 60Th St, Chicago, USA, Il, 60637-2954

Rights statement

Copyright 2014 The American Astronomical Society

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the physical sciences

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