A LOFAR DETECTION of the LOW-MASS YOUNG STAR T TAU at 149 MHz

Coughlan, CP; Ainsworth, RE; Eislöffel, J; Hoeft, M; Drabent, A; Scaife, AMM; Ray, TP; Bell, ME; Broderick, JW; Corbel, S; Grießmeier, JM; Van Der Horst, AJ; Van Leeuwen, J; Markoff, S; Pietka, M; Stewart, AJ; Wijers, RAMJ; Zarka, P

A LOFAR DETECTION of the LOW-MASS YOUNG STAR T TAU at 149 MHz

Coughlan, CP Ainsworth, RE Eislöffel, J Hoeft, M Drabent, A Scaife, AMM Ray, TP Bell, ME

Broderick, JW Corbel, S Grießmeier, JM Van Der Horst, AJ Van Leeuwen, J Markoff, S Pietka, M Stewart, AJ Wijers, RAMJ Zarka, P

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Publication Type:: Journal Article
Citation:: Astrophysical Journal, 2017, 834 (2)
Issue Date:: 2017-01-10

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Field	Value	Language
dc.contributor.author	Coughlan, CP	en_US
dc.contributor.author	Ainsworth, RE	en_US
dc.contributor.author	Eislöffel, J	en_US
dc.contributor.author	Hoeft, M	en_US
dc.contributor.author	Drabent, A	en_US
dc.contributor.author	Scaife, AMM	en_US
dc.contributor.author	Ray, TP	en_US
dc.contributor.author	Bell, ME https://orcid.org/0000-0003-1767-5277	en_US
dc.contributor.author	Broderick, JW	en_US
dc.contributor.author	Corbel, S	en_US
dc.contributor.author	Grießmeier, JM	en_US
dc.contributor.author	Van Der Horst, AJ	en_US
dc.contributor.author	Van Leeuwen, J	en_US
dc.contributor.author	Markoff, S	en_US
dc.contributor.author	Pietka, M	en_US
dc.contributor.author	Stewart, AJ	en_US
dc.contributor.author	Wijers, RAMJ	en_US
dc.contributor.author	Zarka, P	en_US
dc.date.issued	2017-01-10	en_US
dc.identifier.citation	Astrophysical Journal, 2017, 834 (2)	en_US
dc.identifier.issn	0004-637X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/113341
dc.description.abstract	© 2017 Published by Elsevier B.V. Radio observations of young stellar objects (YSOs) enable the study of ionized plasma outflows from young protostars via their free-free radiation. Previous studies of the low-mass young system T Tau have used radio observations to model the spectrum and estimate important physical properties of the associated ionized plasma (local electron density, ionized gas content, and emission measure). However, without an indication of the low-frequency turnover in the free-free spectrum, these properties remain difficult to constrain. This paper presents the detection of T Tau at 149 MHz with the Low Frequency Array (LOFAR)-the first time a YSO has been observed at such low frequencies. The recovered total flux indicates that the free-free spectrum may be turning over near 149 MHz. The spectral energy distribution is fitted and yields improved constraints on local electron density ((7.2 ± 2.1) × 103 cm-3), ionized gas mass ( ± × -1.0 1.8 10-6Ṁ), and emission measure ((1.67 ± 0.14) × 105 pc cm-6).	en_US
dc.relation.ispartof	Astrophysical Journal	en_US
dc.relation.isbasedon	10.3847/1538-4357/834/2/206	en_US
dc.subject.classification	Astronomy & Astrophysics	en_US
dc.title	A LOFAR DETECTION of the LOW-MASS YOUNG STAR T TAU at 149 MHz	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	834	en_US
utslib.for	0201 Astronomical and Space Sciences	en_US
utslib.for	0305 Organic Chemistry	en_US
utslib.for	0306 Physical Chemistry (incl. Structural)	en_US
utslib.for	0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access
pubs.issue	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	834	en_US

Abstract:

© 2017 Published by Elsevier B.V. Radio observations of young stellar objects (YSOs) enable the study of ionized plasma outflows from young protostars via their free-free radiation. Previous studies of the low-mass young system T Tau have used radio observations to model the spectrum and estimate important physical properties of the associated ionized plasma (local electron density, ionized gas content, and emission measure). However, without an indication of the low-frequency turnover in the free-free spectrum, these properties remain difficult to constrain. This paper presents the detection of T Tau at 149 MHz with the Low Frequency Array (LOFAR)-the first time a YSO has been observed at such low frequencies. The recovered total flux indicates that the free-free spectrum may be turning over near 149 MHz. The spectral energy distribution is fitted and yields improved constraints on local electron density ((7.2 ± 2.1) × 103 cm-3), ionized gas mass ( ± × -1.0 1.8 10-6Ṁ), and emission measure ((1.67 ± 0.14) × 105 pc cm-6).

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http://hdl.handle.net/10453/113341