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A multi-wavelength census of star formation activity in the young embedded cluster around Serpens/G3-G6
Aims.The aim of this paper is to characterise the star formationactivity in the poorly studied embedded cluster Serpens/G3-G6, located~45 arcmin (3 pc) to the south of the Serpens Cloud Core, and todetermine the luminosity and mass functions of its population of YoungStellar Objects (YSOs). Methods: .Multi-wavelength broadbandphotometry was obtained to sample the near and mid-IR spectral energydistributions to separate YSOs from field stars and classify the YSOevolutionary stage. ISOCAM mapping in the two filters LW2 (5-8.5 μm)and LW3 (12-18 μm) of a 19 arcmin × 16 arcmin field wascombined with JHKS data from 2MASS, KS data from Arnica/NOT,and L arcmin data from SIRCA/NOT. Continuum emission at 1.3 mm (IRAM)and 3.6 cm (VLA) was mapped to study the cloud structure and thecoldest/youngest sources. Deep narrow band imaging at the 2.12 μmS(1) line of H2 from NOTCam/NOT was obtained to search for signs ofbipolar outflows. Results: .We have strong evidence for a stellarpopulation of 31 Class II sources, 5 flat-spectrum sources, 5 Class Isources, and two Class 0 sources. Our method does not sample the ClassIII sources. The cloud is composed of two main dense clumps alignedalong a ridge over ~0.5 pc plus a starless core coinciding withabsorption features seen in the ISOCAM maps. We find two S-shapedbipolar collimated flows embedded in the NE clump, and propose the twodriving 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 andcompatibility with recent Initial Mass Functions (IMFs) by comparing theobserved Class II luminosity function (LF), which is complete to 0.08Lȯ, to various model LFs with different star formationscenarios and input IMFs.
| Interstellar polarization in a molecular cloud in Serpens.
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| Interstellar extinction in the area of the Serpens cauda molecular cloud.
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Observation and Astrometry data
| Constellation: | Serpens |
| Right ascension: | 18h29m05.58s |
| Declination: | +00°26'24.2" |
| Apparent magnitude: | 9.006 |
| Proper motion RA: | 77.4 |
| Proper motion Dec: | -3.5 |
| B-T magnitude: | 10.144 |
| V-T magnitude: | 9.1 |
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