VERY LARGE ARRAY OBSERVATIONS OF DG TAU'S RADIO JET: A HIGHLY COLLIMATED THERMAL OUTFLOW

C Lynch; R. L Mutel; K. G Gayley; M Guedel; T Ray; S. L Skinner; P. C Schneider

doi:10.1088/0004-637X/766/1/53

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VERY LARGE ARRAY OBSERVATIONS OF DG TAU'S RADIO JET: A HIGHLY COLLIMATED THERMAL OUTFLOW

Journal article

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VERY LARGE ARRAY OBSERVATIONS OF DG TAU'S RADIO JET: A HIGHLY COLLIMATED THERMAL OUTFLOW

C Lynch, R. L Mutel, K. G Gayley, M Guedel, T Ray, S. L Skinner and P. C Schneider

The Astrophysical journal, Vol.766(1), pp.1-8

03/20/2013

DOI: 10.1088/0004-637X/766/1/53

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https://arxiv.org/pdf/1302.0751View

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Abstract

The active young protostar DG Tau has an extended jet that has been well studied at radio, optical, and X-ray wavelengths. We report sensitive new Very Large Array (VLA) full-polarization observations of the core and jet between 5 GHz and 8 GHz. Our high angular resolution observation at 8 GHz clearly shows an unpolarized inner jet with a size of 42 AU (0.''35) extending along a position angle similar to the optical-X ray outer jet. Using our nearly coeval 2012 VLA observations, we find a spectral index {alpha} = +0.46 {+-} 0.05, which combined with the lack of polarization is consistent with bremsstrahlung (free-free) emission, with no evidence for a non-thermal coronal component. By identifying the end of the radio jet as the optical depth unity surface, and calculating the resulting emission measure, we find that our radio results are in agreement with previous optical line studies of electron density and consequent mass-loss rate. We also detect a weak radio knot at 5 GHz located 7'' from the base of the jet, coincident with the inner radio knot detected by Rodriguez et al. in 2009 but at lower surface brightness. We interpret this as due to expansion of post-shock ionized gas in the three years between observations.

Mass Transfer

ASTROPHYSICS, COSMOLOGY AND ASTRONOMY

BREMSSTRAHLUNG

BRIGHTNESS

ELECTRON DENSITY

EMISSION

EXPANSION

GHZ RANGE

JETS

POLARIZATION

SPATIAL RESOLUTION

STELLAR WINDS

WAVELENGTHS

X RADIATION

Details

Title: Subtitle: VERY LARGE ARRAY OBSERVATIONS OF DG TAU'S RADIO JET: A HIGHLY COLLIMATED THERMAL OUTFLOW
Creators: C Lynch - University of Iowa
R. L Mutel - University of Iowa
K. G Gayley - University of Iowa
M Guedel - University of Vienna
T Ray - Dublin Institute For Advanced Studies
S. L Skinner - University of Colorado Boulder
P. C Schneider - Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.766(1), pp.1-8
DOI: 10.1088/0004-637X/766/1/53
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: Institute of Physics (IOP)
Language: English
Date published: 03/20/2013
Academic Unit: Physics and Astronomy
Record Identifier: 9984199856802771

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