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arxiv: astro-ph/0506710 · v1 · submitted 2005-06-28 · 🌌 astro-ph

Is the Cepheus E Outflow driven by a Class 0 Protostar?

classification 🌌 astro-ph
keywords denseoutflowdetectediracmicronscepheusclasscold
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New early release observations of the Cepheus E outflow and its embedded source, obtained with the Spitzer Space Telescope, are presented. We show the driving source is detected in all 4 IRAC bands, which suggests that traditional Class 0 classification, although essentially correct, needs to accommodate the new high sensitivity infrared arrays and their ability to detected deeply embedded sources. The IRAC, MIPS 24 and 70 microns new photometric points are consistent with a spectral energy distribution dominated by a cold, dense envelope surrounding the protostar. The Cep E outflow, unlike its more famous cousin the HH 46/47 outflow, displays a very similar morphology in the near and mid-infrared wavelengths, and is detected at 24 microns. The interface between the dense molecular gas (where Cep E lies) and less dense interstellar medium, is well traced by the emission at 8 and 24 microns, and is one of the most exotic features of the new IRAC and MIPS images. IRS observations of the North lobe of the flow confirm that most of the emission is due to the excitation of pure H2 rotational transitions arising from a relatively cold (Tex~700 K) and dense (N{H}~9.6E20 cm-2 molecular gas.

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  1. ALMA High-resolution Observation of the HH46/47 Outflow/disk/envelope System

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    New ALMA data at 50 au resolution of HH46/47 shows a rotating-infalling envelope to disk transition at 30 au around a 0.3 solar-mass protostar, with outflow shells expanding radially and supporting entrainment over di...