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Recent star formation in the Lupus clouds as seen by Herschel [Letter]

Rygl, K. L. J., Benedettini, M., Schisano, E., Elia, D., Molinari, S., Pezzuto, S., Andre, Ph., Bernard, J. P., White, G. J., Polychroni, D., Bontemps, S., Cox, N. L. J., Di Francesco, J., Facchini, A., Fallscheer, C., di Giorgio, A. M., Hennemann, M., Hill, T., Koenyves, V., Minier, V., Motte, F., Nguyen-Luong, Q., Peretto, Nicolas, Pestalozzi, M., Sadavoy, S., Schneider, N., Spinoglio, L., Testi, L. and Ward-Thompson, Derek 2013. Recent star formation in the Lupus clouds as seen by Herschel [Letter]. Astronomy and Astrophysics 549 , L1. 10.1051/0004-6361/201219511

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Abstract

We present a study of the star formation histories of the Lupus I, III, and IV clouds using the Herschel 70–500 μm maps obtained by the Herschel Gould Belt Survey Key Project. By combining the new Herschel data with the existing Spitzer catalog we obtained an unprecedented census of prestellar sources and young stellar objects in the Lupus clouds, which allowed us to study the overall star formation rate (SFR) and efficiency (SFE). The high SFE of Lupus III, its decreasing SFR, and its large number of pre-main sequence stars with respect to proto- and prestellar sources, suggest that Lupus III is the most evolved cloud, and after having experienced a major star formation event in the past, is now approaching the end of its current star-forming cycle. Lupus I is currently undergoing a large star formation event, apparent by the increasing SFR, the large number of prestellar objects with respect to more evolved objects, and the high percentage of material at high extinction (e.g., above AV ≈ 8   mag). Also Lupus IV has an increasing SFR; however, the relative number of prestellar sources is much lower, suggesting that its star formation has not yet reached its peak.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: stars: formation / stars: protostars / ISM: individual objects: Lupus I / ISM: individual objects: Lupus III / ISM: individual objects: Lupus IV / infrared: ISM
Additional Information: Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0004-6361/ (accessed 16/04/2014)
Publisher: EDP Sciences
ISSN: 0004-6361
Date of First Compliant Deposit: 30 March 2016
Last Modified: 04 Jun 2017 06:05
URI: http://orca-mwe.cf.ac.uk/id/eprint/56254

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