Sign of Hard-X-Ray Pulsation from the 
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-Ray Binary System LS 5039

Yoneda, Hiroki; Makishima, Kazuo; Enoto, T.; Khangulyan, D.; Matsumoto, Takahiro; Takahashi, Tadayuki

doi:10.1103/physrevlett.125.111103

Cited by 46 publications

(40 citation statements)

References 28 publications

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“…Despite the relatively low statistical significance of the detection, and an unexpectedly long period of ≈9 s, these results add significant weight to the pulsar scenario. As the pulsation period is rather long, Yoneda et al (2020) suggest that the neutron star is in fact a magnetar, although the very young age estimated for the CO, ∼500 yr, seems to be at odds with the lack of evidence of the presence of A&A 645, A86 (2021) a supernova remnant (SNR; Moldón et al 2012b). We note that finding a much shorter period was not possible for Yoneda et al (2020) as the data statistics only allowed the search of periods >1 s.…”

Section: Introductionmentioning

confidence: 85%

“…A strongly magnetized flow produced by a young magnetar in LS 5039 was proposed by Yoneda et al (2020) prompted by the evidence of a ≈9 s period in X-ray data. As indicated in Sect.…”

Section: Magnetized Windsmentioning

confidence: 97%

“…Recently, Yoneda et al (2020) have presented evidence of X-ray pulsations in LS 5039. Despite the relatively low statistical significance of the detection, and an unexpectedly long period of ≈9 s, these results add significant weight to the pulsar scenario.…”

Section: Introductionmentioning

confidence: 99%

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Properties of a hypothetical cold pulsar wind in LS 5039

Bosch‐Ramon

2021

A&A

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Context. LS 5039 is a powerful high-mass gamma-ray binary that probably hosts a young non-accreting pulsar. However, despite the wealth of data available, the means by which the non-thermal emitter is powered are still unknown. Aims. We use a dynamical-radiative numerical model, and multiwavelength data, to constrain the properties of a hypothetical pulsar wind that would power the non-thermal emitter in LS 5039. Methods. We ran simulations of an ultrarelativistic (weakly magnetized) cold e±-wind that Compton scatters stellar photons and that dynamically interacts with the stellar wind. The effects of energy losses on the unshocked e±-wind dynamics, and the geometry of the two-wind contact discontinuity, are computed for different wind models. The predicted unshocked e±-wind radiation at periastron, when expected to be the highest, is compared to LS 5039 data. Results. The minimum possible radiation from an isotropic cold e±-wind overpredicts the X-ray to gamma-ray fluxes at periastron by a factor of ∼3. In the anisotropic (axisymmetric) wind case X-ray and ≳100 MeV data are not violated by wind radiation if the wind axis is at ≲20−40° from the line of sight (chance probability of ≲6−24%), depending on the anisotropic wind model, or if the wind Lorentz factor ∈102 − 103, in which case the wind power can be higher, but it requires e±-multiplicities of ∼106 and 109 for a 10−2 s and 10 s pulsar period, respectively. Conclusions. The studied model predicts that a weakly magnetized cold pulsar e±-wind in LS 5039 should be strongly anisotropic, with either a wind Lorentz factor ∈102 − 103 and very high multiplicities or with a fine-tuned wind orientation. A weakly magnetized, cold baryon-dominated wind would be a possible alternative, but then the multiplicities should be rather low, while the baryon-to-e± energy transfer should be very efficient at wind termination. A strongly magnetized cold wind seems to be the most favorable option as it is consistent with recent research on pulsar winds and does not require fine-tuning of the pulsar wind orientation, and the wind multiplicity and Lorentz factor are less constrained.

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Section: Introductionmentioning

confidence: 85%

“…A strongly magnetized flow produced by a young magnetar in LS 5039 was proposed by Yoneda et al (2020) prompted by the evidence of a ≈9 s period in X-ray data. As indicated in Sect.…”

Section: Magnetized Windsmentioning

confidence: 97%

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Properties of a hypothetical cold pulsar wind in LS 5039

Bosch‐Ramon

2021

A&A

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“…LS 5039 is a variable and periodic γ-ray source [46-51], having the shortest orbital period among the γ-ray binaries (3.9 days). At first, it was considered to be a microquasar [51], then the source showed evidence of X-ray pulsations with a period of 9s suggesting that LS 5039 hosts a pulsar, although no radio pulsations have been reported to date [52,53].…”

Section: Ls 5039mentioning

confidence: 99%

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

et al. 2021

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Investigations that were carried out over the last two decades with novel and more sensitive instrumentation have dramatically improved our knowledge of the more violent physical processes taking place in galactic and extra-galactic Black-Holes, Neutron Stars, Supernova Remnants/Pulsar Wind Nebulae, and other regions of the Universe where relativistic acceleration processes are in place. In particular, simultaneous and/or combined observations with γ-ray satellites and ground based high-energy telescopes, have clarified the scenario of the mechanisms responsible for high energy photon emission by leptonic and hadronic accelerated particles in the presence of magnetic fields. Specifically, the European Space Agency INTEGRAL soft γ-ray observatory has detected more than 1000 sources in the soft γ-ray band, providing accurate positions, light curves and time resolved spectral data for them. Space observations with Fermi-LAT and observations that were carried out from the ground with H.E.S.S., MAGIC, VERITAS,and other telescopes sensitive in the GeV-TeV domain have, at the same time, provided evidence that a substantial fraction of the cosmic sources detected are emitting in the keV to TeV band via Synchrotron-Inverse Compton processes, in particular from stellar galactic BH systems as well as from distant black holes. In this work, employing a spatial cross correlation technique, we compare the INTEGRAL/IBIS and TeV all-sky data in search of secure or likely associations. Although this analysis is based on a subset of the INTEGRAL all-sky observations (1000 orbits), we find that there is a significant correlation: 39 objects (∼20% of the VHE γ-ray catalogue) show emission in both soft γ-ray and TeV wavebands. The full INTEGRAL database, now comprising almost 19 years of public data available, will represent an important legacy that will be useful for the Cherenkov Telescope Array (CTA) and other ground based large projects.

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“…The most fascinating fact about gamma-ray binaries is that despite many discussions (both observational and theoretical), the nature of the compact object (and, hence, the binary) has not been well established in most of the systems, except for those where a pulse has been detected (e.g., PSR B1259−63 [3] and LMC P3 [4]); however, recently, possible pulse detection has been reported for LS 5039 [5] and LSI+61 303 [6]. Another interesting issue is why only a few High-Mass X-ray binaries (HMXBs) have shown such high-energy emission, among hundreds of X-ray binaries.…”

Section: Introductionmentioning

confidence: 99%

Optical and Near-Infrared Monitoring of Gamma-ray Binaries Hosting Be Stars

Moritani

Kawachi

2021

Universe

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Optical and near-infrared observations are compiled for the three gamma-ray binaries hosting Be stars: PSR B1259−63, LSI+61 303, and HESS J0632+057. The emissions from the Be disk are considered to vary according to the changes in its structure, some of which are caused by interactions with the compact object (e.g., tidal forces). Due to the high eccentricity and large orbit of these systems, the interactions—and, hence the resultant observables—depend on the orbital phase. To explore such variations, multi-band photometry and linear polarization were monitored for the three considered systems, using two 1.5 m-class telescopes: IRSF at the South African Astronomical Observatory and Kanata at the Higashi–Hiroshima Observatory.

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Sign of Hard-X-Ray Pulsation from the γ -Ray Binary System LS 5039

Cited by 46 publications

References 28 publications

Properties of a hypothetical cold pulsar wind in LS 5039

Properties of a hypothetical cold pulsar wind in LS 5039

INTEGRAL View of TeV Sources: A Legacy for the CTA Project

Optical and Near-Infrared Monitoring of Gamma-ray Binaries Hosting Be Stars

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