SIMBAD references

2018AJ....155..218K - Astron. J., 155, 218-218 (2018/May-0)

VLBA observations of strong anisotripic radio scattering toward the Orion Nebula.

KOUNKEL M., HARTMANN L., LOINARD L., MIODUSZEWSKI A.J., RODRIGUEZ L.F., ORTIZ-LEON G.N., JOHNSON M.D., TORRES R.M. and BRICENO C.

Abstract (from CDS):

We present observations of VLBA 20, a radio source found toward the edge of the Orion Nebula Cluster (ONC). Nonthermal emission dominates the spectral energy distribution of this object from the radio to mid-infrared regime, suggesting that VLBA 20 is extragalactic. This source is heavily scattered in the radio regime. Very Long Baseline Array observations resolve it to ∼34 x 19 mas at 5 GHz, and the wavelength dependence of the scattering disk is consistent with ν–2 at other frequencies. The origin of the scattering is most likely the ionized X-ray emitting gas from the winds of the most massive stars of the ONC. The scattering is highly anisotropic, with the axis ratio of 2:1, higher than what is typically observed toward other sources.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): HII regions - ISM: magnetic fields - scattering

Status in Simbad:  being processed

Simbad objects: 20

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2019.12.10-05:46:36

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