SIMBAD references

2019ApJ...875...94H - Astrophys. J., 875, 94-94 (2019/April-3)

On the nature of the compact sources in IRAS 16293-2422 seen at centimeter to submillimeter wavelengths.

HERNANDEZ-GOMEZ A., LOINARD L., CHANDLER C.J., RODRIGUEZ L.F., ZAPATA L.A., WILNER D.J., HO P.T.P., CAUX E., QUENARD D., BOTTINELLI S., BROGAN C.L., HARTMANN L. and MENTEN K.M.

Abstract (from CDS):

We present multi-epoch continuum observations of the Class 0 protostellar system IRAS 16293-2422 taken with the Very Large Array (VLA) at multiple wavelengths between 7 mm and 15 cm (41 GHz down to 2 GHz), as well as single-epoch Atacama Large Millimeter/submillimeter Array continuum observations covering the range from 0.4 to 1.3 mm (700 GHz down to 230 GHz). The new VLA observations confirm that source A2 is a protostar driving episodic mass ejections, and reveal the complex relative motion between A2 and A1. The spectrum of component B can be described by a single power law (Sν ∝ ν2.28) over the entire range from 3 to 700 GHz (10 cm down to 0.4 mm), suggesting that the emission is entirely dominated by dust even at λ = 10 cm. Finally, the size of source B appears to increase with frequency up to 41 GHz, remaining roughly constant (at 0.''39 ≡ 55 au) at higher frequencies. We interpret this as evidence that source B is a dusty structure of finite size that becomes increasingly optically thick at higher frequencies until, in the millimeter regime, the source becomes entirely optically thick. The lack of excess free-free emission at long wavelengths, combined with the absence of high-velocity molecular emission, indicates that source B does not drive a powerful outflow, and might indicate that source B is at a particularly early stage of its evolution.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrometry - binaries: visual - ISM: individual objects: IRAS 16293-2422 - ISM: jets and outflows - stars: formation - techniques: interferometric

Simbad objects: 11

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2020.01.18-17:09:14

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