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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2006

A multi-wavelength census of star formation activity in the young embedded cluster around Serpens/G3-G6

A. A. Djupvik
  • Fonction : Auteur
Ph. Andre
  • Fonction : Auteur
F. Motte
G. Olofsson
  • Fonction : Auteur
M. Gaalfalk
  • Fonction : Auteur
H. -G. Floren
  • Fonction : Auteur

Résumé

Aims. The aim of this paper is to characterise the star formation activity in the poorly studied embedded cluster Serpens/G3-G6, located ~ 45' (3 pc) to the south of the Serpens Cloud Core, and to determine the luminosity and mass functions of its population of Young Stellar Objects (YSOs). Methods. Multi-wavelength broadband photometry was obtained to sample the near and mid-IR spectral energy distributions to separate YSOs from field stars and classify the YSO evolutionary stage. ISOCAM mapping in the two filters LW2 (5-8.5 um) and LW3 (12-18 um) of a 19' x 16' field was combined with JHKs data from 2MASS, Ks data from Arnica/NOT, and L' data from SIRCA/NOT. Continuum emission at 1.3 mm (IRAM) and 3.6 cm (VLA) was mapped to study the cloud structure and the coldest/youngest sources. Deep narrow band imaging at the 2.12 um S(1) line of H2 from NOTCam/NOT was obtained to search for signs of bipolar outflows. Results. We have strong evidence for a stellar population of 31 Class II sources, 5 flat-spectrum sources, 5 Class I sources, and two Class 0 sources. Our method does not sample the Class III sources. The cloud is composed of two main dense clumps aligned along a ridge over ~ 0.5 pc plus a starless core coinciding with absorption features seen in the ISOCAM maps. We find two S-shaped bipolar collimated flows embedded in the NE clump, and propose the two driving sources to be a Class 0 candidate (MMS3) and a double Class I (MMS2). For the Class II population we find a best age of ~ 2 Myr and compatibility with recent Initial Mass Functions (IMFs) by comparing the observed Class II luminosity function (LF), which is complete to 0.08 L_sun, to various model LFs with different star formation scenarios and input IMFs.

Dates et versions

hal-00129262 , version 1 (06-02-2007)

Identifiants

Citer

A. A. Djupvik, Ph. Andre, Sylvain Bontemps, F. Motte, G. Olofsson, et al.. A multi-wavelength census of star formation activity in the young embedded cluster around Serpens/G3-G6. Astronomy and Astrophysics - A&A, 2006, 458, pp.789-803. ⟨10.1051/0004-6361:20065533⟩. ⟨hal-00129262⟩

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