Class 0 Protostars in the Perseus Molecular Cloud: A Correlation Between the Youngest Protostars and the Dense Gas Distribution

Sadavoy, S. I. and Di Francesco, J. and Andre, Ph. and Pezzuto, S. and Bernard, J. -P. and Maury, A. and Men'shchikov, A. and Motte, F. and Nguyen-Lu'o'ng, Q. and Schneider, N. and Arzoumanian, D. and Benedettini, M. and Bontemps, S. and Elia, D. and Hennemann, M. and Hill, T. and Könyves, Vera and Louvet, F. and Peretto, N. and Roy, A. and White, G. J. (2014) Class 0 Protostars in the Perseus Molecular Cloud: A Correlation Between the Youngest Protostars and the Dense Gas Distribution. ASTROPHYSICAL JOURNAL LETTERS, 787 (2). ISSN 2041-8205

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Abstract

We use PACS and SPIRE continuum data at 160 µm, 250 µm, 350 µm, and 500 µm from the Herschel Gould Belt Survey to sample seven clumps in Perseus: B1, B1-E, B5, IC348, L1448, L1455, and NGC1333. Additionally, we identify and characterize the embedded Class 0 protostars using detections of compact Herschel sources at 70 µm as well as archival Spitzer catalogues and SCUBA 850 µm photometric data. We identify 28 candidate Class 0 protostars, four of which are newly discovered sources not identified with Spitzer. We find that the star formation efficiency of clumps, as traced by Class 0 protostars, correlates strongly with the flatness of their respective column density distributions at high values. This correlation suggests that the fraction of high column density material in a clump reflects only its youngest protostellar population rather than its entire source population. We propose that feedback from either the formation or evolution of protostars changes the local density structure of clumps.

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