A giant radio flare from Cygnus X-3 with associated ?-ray emission

被引：75

作者：

Corbel, S. ^{[1
,2
,3
]}

Dubus, G. ^{[4
]}

Tomsick, J. A. ^{[5
]}

Szostek, A. ^{[6
,7
,8
]}

Corbet, R. H. D. ^{[9
,10
,11
]}

Miller-Jones, J. C. A. ^{[12
]}

Richards, J. L. ^{[13
]}

Pooley, G. ^{[14
]}

Trushkin, S. ^{[15
]}

Dubois, R. ^{[6
,7
]}

Hill, A. B. ^{[16
]}

Kerr, M. ^{[6
,7
]}

Max-Moerbeck, W. ^{[13
]}

Readhead, A. C. S. ^{[13
]}

Bodaghee, A. ^{[5
]}

Tudose, V. ^{[17
]}

Parent, D. ^{[18
]}

Wilms, J. ^{[19
]}

Pottschmidt, K. ^{[9
,10
]}

机构：

[1] Univ Paris 07, F-91191 Gif Sur Yvette, France

[2] CEA Saclay, Serv Astrophys, UMR AIM, F-91191 Gif Sur Yvette, France

[3] Inst Univ France, F-75005 Paris, France

[4] UJF Grenoble 1, CNRS INSU, IPAG, UMR 5274, F-38041 Grenoble, France

[5] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[6] Stanford Univ, Dept Phys, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA

[7] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

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

[9] CRESST, Greenbelt, MD 20771 USA

[10] NASA, Goddard Space Flight Ctr, Astrophys Sci Div, Greenbelt, MD 20771 USA

[11] Univ Maryland Baltimore Cty, Ctr Space Sci & Technol, Baltimore, MD 21250 USA

[12] Curtin Univ, Int Ctr Radio Astron Res, Perth, WA 6845, Australia

[13] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

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

[15] Special Astrophys Observ RAS, Nizhnii Arkhyz 369167, Russia

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

[17] Netherlands Inst Radio Astron, NL-7990 AA Dwingeloo, Netherlands

[18] George Mason Univ, Ctr Earth Observing & Space Res, Coll Sci, Fairfax, VA 22030 USA

[19] Erlangen Ctr Astroparticle Phys, D-91058 Erlangen, Germany

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2012年 / 421卷 / 04期

基金：

美国国家科学基金会;

关键词：

black hole physics; stars: individual: Cyg X-3; ISM: jets and outflows; gamma-rays: stars; radio continuum: stars; X-rays: binaries; X-RAY; RELATIVISTIC JET; VARIABILITY; TELESCOPE; BEHAVIOR; LEVEL; WIND;

D O I：

10.1111/j.1365-2966.2012.20517.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

With frequent flaring activity of its relativistic jets, Cygnus X-3 (Cyg X-3) is one of the most active microquasars and is the only Galactic black hole candidate with confirmed high-energy ?-ray emission, thanks to detections by Fermi Large Area Telescope (Fermi/LAT) and AGILE. In 2011, Cyg X-3 was observed to transit to a soft X-ray state, which is known to be associated with high-energy ?-ray emission. We present the results of a multiwavelength campaign covering a quenched state, when radio emission from Cyg X-3 is at its weakest and the X-ray spectrum is very soft. A giant (similar to 20 Jy) optically thin radio flare marks the end of the quenched state, accompanied by rising non-thermal hard X-rays. Fermi/LAT observations (E= 100 MeV) reveal renewed ?-ray activity associated with this giant radio flare, suggesting a common origin for all non-thermal components. In addition, current observations unambiguously show that the ?-ray emission is not exclusively related to the rare giant radio flares. A three-week period of ?-ray emission is also detected when Cyg X-3 was weakly flaring in radio, right before transition to the radio quenched state. No ?-rays are observed during the similar to 1-month long quenched state, when the radio flux is weakest. Our results suggest transitions into and out of the ultrasoft X-ray (radio-quenched) state trigger ?-ray emission, implying a connection to the accretion process, and also that the ?-ray activity is related to the level of radio flux (and possibly shock formation), strengthening the connection to the relativistic jets.

引用

页码：2947 / 2955

页数：9

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