TENTATIVE EVIDENCE FOR RELATIVISTIC ELECTRONS GENERATED BY THE JET OF THE YOUNG SUN-LIKE STAR DG Tau

被引：41

作者：

Ainsworth, Rachael E. ^{[1
,2
]}

Scaife, Anna M. M. ^{[3
]}

Ray, Tom P. ^{[1
,2
]}

Taylor, Andrew M. ^{[1
]}

Green, David A. ^{[4
]}

Buckle, Jane V. ^{[4
,5
]}

机构：

[1] Dublin Inst Adv Studies, Dublin 2, Ireland

[2] Univ Dublin Trinity Coll, Sch Phys, Dublin 2, Ireland

[3] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

[4] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[5] Kavli Inst Cosmol, Cambridge CB3 0HA, England

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2014年 / 792卷 / 01期

基金：

欧洲研究理事会; 爱尔兰科学基金会;

关键词：

radiation mechanisms: non-thermal; stars: individual (DG Tau); stars: low-mass; stars: mass-loss; RADIO-CONTINUUM OBSERVATIONS; MAGNETIC-FIELDS; SCALE; OUTFLOWS; CLOUDS;

D O I：

10.1088/2041-8205/792/1/L18

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Synchrotron emission has recently been detected in the jet of a massive protostar, providing further evidence that certain jet formation characteristics for young stars are similar to those found for highly relativistic jets from active galactic nuclei. We present data at 325 and 610 MHz taken with the Giant Metrewave Radio Telescope of the young, low-mass star DG Tau, an analog of the Sun soon after its birth. This is the first investigation of a low-mass young stellar object at such low frequencies. We detect emission with a synchrotron spectral index in the proximity of the DG Tau jet and interpret this emission as a prominent bow shock associated with this outflow. This result provides tentative evidence for the acceleration of particles to relativistic energies due to the shock impact of this otherwise very low-power jet against the ambient medium. We calculate the equipartition magnetic field strength B-min approximate to 0.11 mG and particle energy E-min approximate to 4 x 10(40) erg, which are the minimum requirements to account for the synchrotron emission of the DG Tau bow shock. These results suggest the possibility of low energy cosmic rays being generated by young Sun-like stars.

引用

页数：5

共 35 条

[31] THE TAURUS SPITZER SURVEY: NEW CANDIDATE TAURUS MEMBERS SELECTED USING SENSITIVE MID-INFRARED PHOTOMETRY [J].

Rebull, L. M. ;

Padgett, D. L. ;

McCabe, C. -E. ;

Hillenbrand, L. A. ;

Stapelfeldt, K. R. ;

Noriega-Crespo, A. ;

Carey, S. J. ;

Brooke, T. ;

Huard, T. ;

Terebey, S. ;

Audard, M. ;

Monin, J. -L. ;

Fukagawa, M. ;

Guedel, M. ;

Knapp, G. R. ;

Menard, F. ;

Allen, L. E. ;

Angione, J. R. ;

Baldovin-Saavedra, C. ;

Bouvier, J. ;

Briggs, K. ;

Dougados, C. ;

Evans, N. J. ;

Flagey, N. ;

Guieu, S. ;

Grosso, N. ;

Glauser, A. M. ;

Harvey, P. ;

Hines, D. ;

Latter, W. B. ;

Skinner, S. L. ;

Strom, S. ;

Tromp, J. ;

Wolf, S. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2010, 186 (02) :259-307

[32] CONTINUUM SPECTRA OF COLLIMATED, IONIZED STELLAR WINDS [J].

REYNOLDS, SP .

ASTROPHYSICAL JOURNAL, 1986, 304 (02) :713-720

[33] Radio continuum emission from knots in the DG Tauri jet [J].

Rodriguez, L. F. ;

Gonzalez, R. F. ;

Raga, A. C. ;

Canto, J. ;

Riera, A. ;

Loinard, L. ;

Dzib, S. A. ;

Zapata, L. A. .

ASTRONOMY & ASTROPHYSICS, 2012, 537

[34] Radio continuum observations of Class I protostellar discs in Taurus: constraining the greybody tail at centimetre wavelengths [J].

Scaife, Anna M. M. ;

Buckle, Jane V. ;

Ainsworth, Rachael E. ;

Davies, Matthew ;

Franzen, Thomas M. O. ;

Grainge, Keith J. B. ;

Hobson, Michael P. ;

Hurley-Walker, Natasha ;

Lasenby, Anthony N. ;

Olamaie, Malak ;

Perrott, Yvette C. ;

Pooley, Guy G. ;

Ray, Tom P. ;

Richer, John S. ;

Rodriguez-Gonzalvez, Carmen ;

Saunders, Richard D. E. ;

Schammel, Michel P. ;

Scott, Paul F. ;

Shimwell, Timothy ;

Titterington, David ;

Waldram, Elizabeth .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2012, 420 (04) :3334-3343

[35]

WHITE SM, 1992, ASTRON ASTROPHYS, V259, P149

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