Evidence of triggered star formation in G327.3-0.6. Dust-continuum mapping of an infrared dark cloud with P-ArTéMiS

V. Minier (1, 2) , Ph. André (1, 2) , P. Bergman (3, 4) , F. Motte (1, 2) , F. Wyrowski (5) , J. Le Pennec (1, 2) , L. Rodriguez (1, 2) , O. Boulade (1, 2) , E. Doumayrou (1, 2) , D. Dubreuil (1, 2) , P. Gallais (1, 2) , G. Hamon (1, 2) , P.-O. Lagage (1, 2) , M. Lortholary (1, 2) , J. Martignac (1, 2) , V. Revéret (1, 2, 4) , Hervé Roussel (6) , M. Talvard (1, 2) , G. Willmann (1, 2) , H. Olofsson (3)

1 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
2 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
3 OSO - Onsala Space Observatory
4 ESO
5 MPIFR - Max-Planck-Institut für Radioastronomie
6 IAP - Institut d'Astrophysique de Paris

Aims. Expanding HII regions and propagating shocks are common in the environment of young high-mass star-forming complexes. They can compress a pre-existing molecular cloud and trigger the formation of dense cores. We investigate whether these phenomena can explain the formation of high-mass protostars within an infrared dark cloud located at the position of G327.3-0.6 in the Galactic plane, in between two large infrared bubbles and two HII regions. Methods: The region of G327.3-0.6 was imaged at 450 μ m with the CEA P-ArTéMiS bolometer array on the Atacama Pathfinder EXperiment telescope in Chile. APEX/LABOCA and APEX-2A, and Spitzer/IRAC and MIPS archives data were used in this study. Results: Ten massive cores were detected in the P-ArTéMiS image, embedded within the infrared dark cloud seen in absorption at both 8 and 24 μm. Their luminosities and masses indicate that they form high-mass stars. The kinematical study of the region suggests that the infrared bubbles expand toward the infrared dark cloud. Conclusions: Under the influence of expanding bubbles, star formation occurs in the infrared dark areas at the border of HII regions and infrared bubbles.

Mots clés: star: formation; HII region

Domaines: Astrophysique galactique [astro-ph.GA]; Astrophysique galactique [astro-ph.GA]

V. Minier, Ph. André, P. Bergman, F. Motte, F. Wyrowski, et al.. Evidence of triggered star formation in G327.3-0.6. Dust-continuum mapping of an infrared dark cloud with P-ArTéMiS. Astronomy and Astrophysics - A&A, 2009, 501, pp.L1-L4. ⟨10.1051/0004-6361/200912308⟩. ⟨hal-00404301⟩