A FLARE IN THE JET OF PICTOR A

被引：29

作者：

Marshall, H. L. ^{[1
]}

Hardcastle, M. J. ^{[2
]}

Birkinshaw, M. ^{[3
,4
]}

Croston, J. ^{[5
]}

Evans, D. ^{[1
]}

Landt, H. ^{[6
]}

Lenc, E. ^{[7
]}

Massaro, F. ^{[3
]}

Perlman, E. S. ^{[8
]}

Schwartz, D. A. ^{[3
]}

Siemiginowska, A. ^{[3
]}

Stawarz, L. ^{[9
,10
]}

Urry, C. M. ^{[11
]}

Worrall, D. M. ^{[3
,4
]}

机构：

[1] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[2] Univ Hertfordshire, Sch Phys Astron & Math, Hatfield AL10 9AB, Herts, England

[3] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[4] Univ Bristol, Dept Phys, Bristol BS8 1TL, Avon, England

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

[6] Univ Melbourne, Sch Phys, Melbourne, Vic 3010, Australia

[7] CSIRO, Australia Telescope Natl Facil, Epping, NSW 2121, Australia

[8] Florida Inst Technol, Dept Phys & Space Sci, Melbourne, FL 32901 USA

[9] JAXA ISAS, Sagamihara, Kanagawa 2298510, Japan

[10] Jagiellonian Univ, Astron Observ, PL-30244 Krakow, Poland

[11] Yale Univ, Dept Phys, New Haven, CT 06511 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 714卷 / 02期

基金：

美国国家航空航天局;

关键词：

galaxies: active; galaxies: individual (Pictor A); galaxies: jets; X-rays: galaxies; X-RAY-EMISSION; M87; JET; CHANDRA; HST-1;

D O I：

10.1088/2041-8205/714/2/L213

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A Chandra X-ray imaging observation of the jet in Pictor A showed a feature that appears to be a flare that faded between 2000 and 2002. The feature was not detected in a follow-up observation in 2009. The jet itself is over 150 kpc long and about 1 kpc wide, so finding year-long variability is surprising. Assuming a synchrotron origin of the observed high-energy photons and a minimum energy condition for the outflow, the synchrotron loss time of the X-ray emitting electrons is of order 1200 years, which is much longer than the observed variability timescale. This leads to the possibility that the variable X-ray emission arises from a very small sub-volume of the jet, characterized by a magnetic field that is substantially larger than the average over the jet.

引用

页码：L213 / L216

页数：4

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