On the Nature of the Compact Sources in IRAS 16293-2422 Seen at Centimeter to Submillimeter Wavelengths - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Year : 2019

On the Nature of the Compact Sources in IRAS 16293-2422 Seen at Centimeter to Submillimeter Wavelengths

, , , , , , , (1) , , (1) , , ,
1
Antonio Hernández-Gómez
  • Function : Author
Laurent Loinard
Claire J. Chandler
  • Function : Author
Luis F. Rodríguez
  • Function : Author
Luis A. Zapata
  • Function : Author
David J. Wilner
  • Function : Author
Paul T. P. Ho
  • Function : Author
David Quénard
  • Function : Author
Crystal L. Brogan
  • Function : Author
Lee Hartmann
  • Function : Author
Karl M. Menten
  • Function : Author

Abstract

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 (S ν ∝ ν 2.28) 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.

Dates and versions

insu-03674450 , version 1 (20-05-2022)

Identifiers

Cite

Antonio Hernández-Gómez, Laurent Loinard, Claire J. Chandler, Luis F. Rodríguez, Luis A. Zapata, et al.. On the Nature of the Compact Sources in IRAS 16293-2422 Seen at Centimeter to Submillimeter Wavelengths. The Astrophysical Journal, 2019, 875, ⟨10.3847/1538-4357/ab0c97⟩. ⟨insu-03674450⟩
1 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More