Radio flux density variations of Cygnus X-3

Johnston, K. J.; Spencer, J. H.; Simon, R. S.; Waltman, E. B.; Pooley, G. G.; Spencer, R. E.; Swinney, R.; Angerhofer, P. E.; Florkowski, D. R.; Josties, F. J.; McCarthy, Dennis D.; Matsakis, Demetrios; Reese, D. E.; Hjellming, R. M.

doi:10.1086/164639

Cited by 24 publications

(9 citation statements)

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“…They also claimed evidence for a periodicity in the range 4.8–5.1 h, although such a periodicity has not since been detected (e.g. Johnston et al 1986, who note that in fact the amplitude of any periodic phenomenon in the data of Molnar et al is less than 30 mJy). To search for any periodicity in our data, we constructed the power spectra of the light curves at the two frequencies, which are shown in Fig.…”

Section: Opacity Effectsmentioning

confidence: 97%

Opacity effects and shock-in-jet modelling of low-level activity in Cygnus X-3

Miller-Jones

Rupen²,

Türler

et al. 2009

Monthly Notices of the Royal Astronomical Society

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We present simultaneous dual-frequency radio observations of Cygnus X-3 during a phase of low-level activity. We constrain the minimum variability time-scale to be 20 min at 43 GHz and 30 min at 15 GHz, implying source sizes of 2-4 au. We detect polarized emission at a level of a few per cent at 43 GHz which varies with the total intensity. The delay of ∼10 min between the peaks of the flares at the two frequencies is seen to decrease with time, and we find that synchrotron self-absorption and free-free absorption by entrained thermal material play a larger role in determining the opacity than absorption in the stellar wind of the companion. A shock-in-jet model gives a good fit to the light curves at all frequencies, demonstrating that this mechanism, which has previously been used to explain the brighter, longer lived giant outbursts in this source, is also applicable to these low-level flaring events. Assembling the data from outbursts spanning over two orders of magnitude in flux density shows evidence for a strong correlation between the peak brightness of an event, and the time-scale and frequency at which this is attained. Brighter flares evolve on longer time-scales and peak at lower frequencies. Analysis of the fitted model parameters suggests that brighter outbursts are due to shocks forming further downstream in the jet, with an increased electron normalization and magnetic field strength both playing a role in setting the strength of the outburst.

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Section: Opacity Effectsmentioning

confidence: 97%

Opacity effects and shock-in-jet modelling of low-level activity in Cygnus X-3

Miller-Jones

Rupen²,

Türler

et al. 2009

Monthly Notices of the Royal Astronomical Society

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“…period change: [380,712]; long-term X-ray obs. : [289,564]; no X-ray pulsations: [380,782]; orbital X-ray curve: [55,377]; aperiodic variability: [38]; X-ray halo: [490]; transient QPO: [713]; radio outbursts: [241,282,346,492]; quiescent radio flares (period 4.95 h? ): [491]; radio jet & lobes: [55,222,664]; IR phot.…”

Section: Remarks On Some Individual Objectsmentioning

confidence: 99%

A catalogue of high-mass X-ray binaries

Liu

Paradijs

Heuvel

2000

Astron. Astrophys. Suppl. Ser.

194

204

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Abstract. We present a catalogue of high-mass X-ray binaries. The catalogue is an updated version of the catalogue of van Paradijs (1995). This new catalogue contains 130 sources, 61 new high-mass X-ray binaries in addition to the 69 sources listed in van Paradijs' catalogue. Most of the new sources are identified to be Be/X-ray binaries. Some sources, however, are only tentatively identified as high-mass X-ray binaries on the basis of a transient character and/or a hard X-ray spectrum. Further identification in other wavelength bands is needed to finally determine the features of these sources.The aim of this catalogue is to provide the reader with some basic information on the X-ray sources and their counterparts in other wavelength ranges (UV, optical, IR, radio). In cases where there is some doubt about the highmass nature of the X-ray binary this is mentioned. Some doubtful cases have not been included in the catalogue although they had been suggested by some authors to be high-mass X-ray binaries, for example GRS 1915+105 and 1WGA J1958.2+3232.

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“…period change: [386,787,709]; long-term X-ray obs. : [301,619]; no X-ray pulsations: [386,851]; orbital X-ray curve: [54,383]; aperiodic variability: [35,61]; X-ray halo: [530]; transient QPO: [788]; radio outbursts: [255,360,567]; quiescent radio flares (period 4.95 h? ): [531]; two-sided relativistic jet (µQ): [481,480,740]; one-sided highly relativistic jet: [225,520]; IR phot.…”

Section: Conclusion and Remarksmentioning

confidence: 99%

Catalogue of high-mass X-ray binaries in the Galaxy ($4^{th}$ edition)

Liu,

van Paradijs,

Heuvel

2007

Preprint

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Aims. The aim of this catalogue is to provide the reader with some basic information on the X-ray sources and their counterparts in other wavelength ranges (γ-rays, UV, optical, IR, radio). Methods. Some sources, however, are only tentatively identified as high-mass X-ray binaries on the basis of their X-ray properties similar to the known high-mass X-ray binaries. Further identification in other wavelength bands is needed to finally determine the nature of these sources. In cases where there is some doubt about the high-mass nature of the X-ray binary this is mentioned. Literature published before 1 October 2005 has, as far as possible, been taken into account.Results. We present a new edition of the catalogue of high-mass X-ray binaries in the Galaxy. The catalogue contains source name(s), coordinates, finding chart, X-ray luminosity, system parameters, and stellar parameters of the components and other characteristic properties of 114 high-mass X-ray binaries, together with a comprehensive selection of the relevant literature. About 60% of the high-mass X-ray binary candidates are known or suspected Be/X-ray binaries, while 32% are supergiant/X-ray binaries.

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Radio flux density variations of Cygnus X-3

Cited by 24 publications

References 0 publications

Opacity effects and shock-in-jet modelling of low-level activity in Cygnus X-3

Opacity effects and shock-in-jet modelling of low-level activity in Cygnus X-3

A catalogue of high-mass X-ray binaries

Catalogue of high-mass X-ray binaries in the Galaxy ($4^{th}$ edition)

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