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Initial highlights of the HOBYS key program, the Herschel imaging survey of OB young stellar objects

F. Motte 1, 2 Annie Zavagno 3, 4 Sylvain Bontemps 5, 6, 7, 8 N. Schneider 1 M. Hennemann 1 J. Di Francesco 9 Ph. André 1 P. Saraceno 10 M. Griffin 11 A. Marston D. Ward-Thompson 11 G. White 12 V. Minier 1, 2 A. Men'Shchikov 1 T. Hill 1 A. Abergel 13 L. D. Anderson 3 H. Aussel 14 Z. Balog 15 J.-P. Baluteau J.-Ph. Bernard 16 P. Cox T. Csengeri 1 L. Deharveng 3, 4 P. Didelon 1 A.-M. Di Giorgio 10 P. Hargrave M. Huang 17 J. Kirk 11 S. Leeks 12 J. Z. Li 17 P. Martin 18 S. Molinari 10 Q. Nguyen-Luong 1 G. Olofsson 19 P. Persi 10 N. Peretto 1 S. Pezzuto 10 Hervé Roussel 20 D. Russeil 3 S. Sadavoy 9 M. Sauvage 1 B. Sibthorpe 21 L. Spinoglio 22 L. Testi 23 D. Teyssier 24 R. Vavrek C. D. Wilson A. Woodcraft 21
Abstract : We present the initial highlights of the HOBYS key program, which are based on Herschel images of the Rosette molecular complex and maps of the RCW120 H ii region. Using both SPIRE at 250/350/500 μm and PACS at 70/160 μm or 100/160 μm, the HOBYS survey provides an unbiased and complete census of intermediate- to high-mass young stellar objects, some of which are not detected by Spitzer. Key core properties, such as bolometric luminosity and mass (as derived from spectral energy distributions), are used to constrain their evolutionary stages. We identify a handful of high-mass prestellar cores and show that their lifetimes could be shorter in the Rosette molecular complex than in nearby low-mass star-forming regions. We also quantify the impact of expanding H ii regions on the star formation process acting in both Rosette and RCW 120. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.Figures 4 and 5 are only available in electronic form at http://www.aanda.org
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F. Motte, Annie Zavagno, Sylvain Bontemps, N. Schneider, M. Hennemann, et al.. Initial highlights of the HOBYS key program, the Herschel imaging survey of OB young stellar objects. Astronomy and Astrophysics - A&A, EDP Sciences, 2010, 518, pp.L77. ⟨10.1051/0004-6361/201014690⟩. ⟨hal-00526246⟩

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