A LOFAR detection of the low mass young star T Tau at 149 MHz

Colm P. Coughlan 1 Rachael E. Ainsworth 1 Jochen Eislöffel 2 Matthias Hoeft 2 Alexander Drabent 2 Anna M. M. Scaife 3 Tom P. Ray 1 Martin E. Bell 4 Jess W. Broderick 3 Stéphane Corbel 5, 6 Jean-Mathias Grießmeier 5, 7 Alexander J. Van Der Horst 8 Joeri Van Leeuwen 9 Sera Markoff 8 Malgorzata Pietka 10 Adam J. Stewart 11 Ralph A. M. J. Wijers 8 Philippe Zarka 12, 5
1 DIAS - Dublin Institute for Advanced Studies
2 TLS - Thüringer Landessternwarte Tautenburg
3 School of Physics and Astronomy [Southampton]
4 MPA - Max-Planck-Institut für Astrophysik
5 USN - Unité Scientifique de la Station de Nançay
6 AIM - UMR 7158 - UMR E 9005 - Astrophysique Interprétation Modélisation
7 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
8 AI PANNEKOEK - Astronomical Institute Anton Pannekoek
9 UvA - University of Amsterdam [Amsterdam]
10 Oxford Astrophysics
11 LASP - Laboratory for Atmospheric and Space Physics [Boulder]
12 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
Abstract : Radio observations of young stellar objects (YSOs) enable the study of ionised 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 ionised plasma (local electron density, ionised 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) × 10 3 cm −3), ionised gas mass ((1.0 ± 1.8) × 10 −6 M ⊙) and emission measure ((1.67 ± 0.14) × 10 5 pc cm −6).
Document type :
Journal articles
Liste complète des métadonnées

Cited literature [19 references]  Display  Hide  Download
https://hal-insu.archives-ouvertes.fr/insu-01526723
Contributor : Nathalie Rouchon <>
Submitted on : Tuesday, May 23, 2017 - 2:22:34 PM
Last modification on : Friday, April 5, 2019 - 8:19:28 PM
Document(s) archivé(s) le : Monday, August 28, 2017 - 5:17:05 PM

File

1611.03282.pdf
Files produced by the author(s)

Licence

Distributed under a Creative Commons Attribution - NonCommercial - NoDerivatives 4.0 International License

Identifiers

Collections

INSU | UNIV-ORLEANS | OBSPM | LESIA | UPMC | PSL | USN | SORBONNE-UNIVERSITE | OSUC | LPC2E | IRFU-AIM | CEA | DSM-IRFU | CEA-DRF | SU-SCIENCES | UNIV-PARIS7 | USPC

Citation

Colm P. Coughlan, Rachael E. Ainsworth, Jochen Eislöffel, Matthias Hoeft, Alexander Drabent, et al.. A LOFAR detection of the low mass young star T Tau at 149 MHz. Astrophysical Journal, American Astronomical Society, 2017, 834 (2), 206 (10 p.). ⟨10.3847/1538-4357/834/2/206⟩. ⟨insu-01526723⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

2817

Files downloads

91

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD