Astronomy and Astrophysics, volume 458, 789-803 (2006/11-2)
A multi-wavelength census of star formation activity in the young embedded cluster around Serpens/G3-G6.
DJUPVIK A.A., ANDRE P., BONTEMPS S., MOTTE F., OLOFSSON G., GALFALK M. and FLOREN H.-G.
Abstract (from CDS):
The aim of this paper is to characterise the star formation activity in the poorly studied embedded cluster Serpens/G3-G6, located ∼45' (3pc) to the south of the Serpens Cloud Core, and to determine the luminosity and mass functions of its population of Young Stellar Objects (YSOs). 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 (5-8.5µm) and LW3 (12-18µm) of a 19'x16' field was combined with JHKS data from 2MASS, KS data from Arnica/NOT, and L' data from SIRCA/NOT. Continuum emission at 1.3mm (IRAM) and 3.6cm (VLA) was mapped to study the cloud structure and the coldest/youngest sources. Deep narrow band imaging at the 2.12µm S(1) line of H2 from NOTCam/NOT was obtained to search for signs of bipolar outflows. We have strong evidence for a stellar population of 31 ClassII sources, 5 flat-spectrum sources, 5 ClassI sources, and two Class0 sources. Our method does not sample the ClassIII sources. The cloud is composed of two main dense clumps aligned along a ridge over ∼0.5pc 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 Class0 candidate (MMS3) and a double ClassI (MMS2). For the ClassII population we find a best age of ∼2Myr and compatibility with recent Initial Mass Functions (IMFs) by comparing the observed ClassII luminosity function (LF), which is complete to 0.08L☉, to various model LFs with different star formation scenarios and input IMFs.
stars: formation - stars: pre-main sequence - stars: luminosity function, mass function - ISM: jets and outflows - stars: low-mass, brown dwarfs
VizieR on-line data:
<Available at CDS (J/A+A/458/789): table1.dat table2.dat table3.dat>
Table 1: [DAB2006] ISO-NNN (Nos 1 to 186). Table 2: [DAB2006] NOT-NNNN (Nos 1 to 1148). Table 3: [DAB2006] SIRCA-NN (Nos 1 to 46). Table 7: [DAB2006] MMSN (Nos MMS1 to MMS4), [DAB2006] MMS1-a (Nos 1-a to 1-d). Table 8: [DAB2006] VLA-N (Nos 1 to 9). Text: NAME Serpens NH3.
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