A Dense Microcluster of Class 0 Protostars in NGC 2264 D-MM1

A dense micro-cluster of Class 0 protostars in NGC 2264D-MM1

We present sensitive and high angular resolution (∼ 1′′) 1.3 mm continuum observations of the dusty core D-MM1 in the Spokes cluster in NGC 2264 using the Submillimeter Array. A dense micro-cluster of seven Class 0 sources was detected in a 20′′× 20′′ region with masses between 0.4 to 1.2 M and deconvolved sizes of about 600 AU. We interpret the 1.3 mm emission as arising from the envelopes of ...

Probing the formation of intermediate- to high-mass stars in protoclusters

We present the results of dust continuum and molecular line observations of two massive cluster-forming clumps, NGC 2264-C and NGC 2264-D, including extensive mapping performed with the MAMBO bolometer array and the HERA heterodyne array on the IRAM 30m telescope. Both NGC 2264 clumps are located in the Mon OB1 giant molecular cloud complex, adjacent to one another. Twelve and fifteen compact m...

Infall models of Class 0 protostars

We have carried out radiative transfer calculations of infalling, dusty envelopes surrounding embedded protostars to understand the observed properties of the recently identified “Class 0” sources. To match the far-infrared peaks in the spectral energy distributions of objects such as the prototype Class 0 source VLA 1623, pure collapse models require mass infall rates ∼10−4M yr−1. The radial i...

0 A High Resolution Radio Survey of Class I Protostars

We report the results of a survey of low mass Class I protostars in the cm continuum. In the initial survey, seven sources in the Taurus star formation were observed with the VLA at 0 " .25 resolution. All seven sources drive CO outflows and display Herbig-Haro flows in the optical or near infrared wavebands. 4/7 sources were detected, two of which are new discoveries in systems of very low lum...

The N 2 D + / N 2 H + ratio as an evolutionary tracer of Class 0 protostars . ⋆