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NASA Technical Reports Server (NTRS) 20120013290: A Giant Radio Fla... |
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by NASA Technical Reports Server (NTRS) |
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With frequent flaring activity of its relativistic jets, |
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Cygnus X-3 (Cyg X-3) is one of the most active |
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microquasars and is the only Galactic black hole |
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candidate with confirmed high energy gamma-ray emission, |
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thanks to detections by Fermi/LAT and AGILE. In 2011, Cyg |
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X-3 was observed to transit to a soft X-ray state, which |
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is known to be associated with high-energy gamma-ray |
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emission. We present the results of a multiwavelength |
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campaign covering a quenched state, when radio emission |
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from Cyg X-3 is at its weakest and the X-ray spectrum is |
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very soft. A giant (approx 20 Jy) optically thin radio |
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flare marks the end of the quenched state, accompanied by |
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rising non-thermal hard X-rays. Fermi/LAT observations (E |
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greater than or equal 100 MeV) reveal renewed gamma-ray |
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activity associated with this giant radio flare, |
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suggesting a common origin for all non-thermal |
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components. In addition, current observations |
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unambiguously show that the gamma-ray emission is not |
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exclusively related to the rare giant radio flares. A 3- |
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week period of gamma-ray emission is also detected when |
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Cyg X-3 was weakly flaring in radio, right before |
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transition to the radio quenched state. No gamma rays are |
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observed during the one-month long quenched state, when |
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the radio flux is weakest. Our results suggest |
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transitions into and out of the ultrasoft X-ray (radio |
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quenched) state trigger gamma-ray emission, implying a |
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connection to the accretion process, and also that the |
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gamma-ray activity is related to the level of radio flux |
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(and possibly shock formation), strengthening the |
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connection to the relativistic jets. |
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Date Published: 2016-11-11 07:43:51 |
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Identifier: NASA_NTRS_Archive_20120013290 |
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Item Size: 8862285 |
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Language: english |
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Media Type: texts |
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