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29 March 2024 |
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Discovery of Large-Scale Gravitational Infall in a Possible Massive Protostellar Cluster | Peter J. Barnes
; Yoshinori Yonekura
; Stuart D. Ryder
; Andrew M. Hopkins
; Yosuke Miyamoto
; Naoko Furukawa
; Yasuo Fukui
; | Date: |
9 Dec 2008 | Abstract: | We report Mopra (ATNF), Anglo-Australian Telescope, and Atacama Submillimeter
Telescope Experiment observations of a molecular core in Carina, BY72 =
G286.21+0.17, which give evidence of large-scale gravitational infall in the
dense gas. From the millimetre and far-infrared data, the core has mass ~ 5,000
Msun, luminosity ~ 2-3 x 10^4 Lsun, diameter ~ 0.9 pc, and mass infall rate ~
2.4 x 10^-2 Msun yr-1. If confirmed, this rate for gravitational infall in a
molecular core may be the highest yet seen. The near-infrared K-band imaging
shows an adjacent compact HII region and IR cluster surrounded by a shell-like
photodissociation region showing H2 emission. At the molecular infall peak, the
K imaging also reveals a deeply embedded group of stars with associated H2
emission. The combination of these features is very unusual and we suggest they
indicate the ongoing formation of a massive star cluster. We discuss the
implications of these data for competing theories of massive star formation. | Source: | arXiv, 0812.1789 | Services: | Forum | Review | PDF | Favorites |
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