6533b82cfe1ef96bd128ffad
RESEARCH PRODUCT
Long-term X-ray variability of the microquasar system LS 5039/RX J1826.2−1450
Marc RibóJ. M. ParedesPablo ReigJosep Martísubject
HydrogenVariable starschemistry.chemical_elementFOS: Physical sciencesAstrophysicsCompact starAstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICAAccretion rateRadio astronomyQuasarsQuàsarsEstels binaris de raigs XOrbital elementsPhysicsSpectral indexRX J1826.2−1450Astrophysics (astro-ph)X-rayIndividual Star ; LS 5039 ; RX J1826.2−1450 ; 3EG J1824−1514 – X-rays ; Variable stars ;; General–radio continuumAstronomy and AstrophysicsIndividual StarLight curveGeneral–radio continuum:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]StarsEstelsX-ray binarieschemistrySpace and Planetary ScienceRadioastronomiaLS 50393EG J1824−1514 – X-raysUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogoniaOrder of magnitude:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]description
We report on the results of the spectral and timing analysis of a BeppoSAX observation of the microquasar system LS 5039/RX J1826.2-1450. The source was found in a low-flux state with Fx(1-10 keV)= 4.7 x 10^{-12} erg cm^{-2} s^{-1}, which represents almost one order of magnitude lower than a previous RXTE observation 2.5 years before. The 0.1--10 keV spectrum is described by an absorbed power-law continuum with photon-number spectral index Gamma=1.8+-0.2 and hydrogen column density of NH=1.0^{+0.4}_{-0.3} x 10^{22} cm^{-2}. According to the orbital parameters of the system the BeppoSAX observation covers the time of an X-ray eclipse should one occur. However, the 1.6-10 keV light curve does not show evidence for such an event, which allows us to give an upper limit to the inclination of the system. The low X-ray flux detected during this observation is interpreted as a decrease in the mass accretion rate onto the compact object due to a decrease in the mass-loss rate from the primary.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-01-01 |