Extended X-ray emission in the vicinity of the microquasar LS 5039

Pulsar wind nebula?

Martin Durant, Oleg Kargaltsev, George Pavlov, Chulhoon Chang, Gordon P. Garmire

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

LS5039 is a high-mass binary with a period of 4 days, containing a compact object and an O-star, one of the few high-mass binaries detected in γ-rays. Our Chandra Advanced CCD Imaging Spectrometer observation of LS 5039 provided a high-significance (10σ) detection of extended emission clearly visible for up to 1′ from the point source. The spectrum of this emission can be described by an absorbed power-law model with photon index Γ = 1.9 0.3, somewhat softer than the point-source spectrum Γ = 1.44 0.07, with the same absorption, NH = (6.4 0.6) × 10 21cm-2. The observed 0.5-8keV flux of the extended emission is ≃ 8.8 × 10-14ergs-1cm-2 or 5% of the point-source flux; the latter is a factor of 2 lower than the lowest flux detected so far. Fainter extended emission with comparable flux and a softer (Γ 3) spectrum is detected at even greater radii (up to 2′). Two possible interpretations of the extended emission are a dust scattering halo and a synchrotron nebula powered by energetic particles escaping the binary. We discuss both of these scenarios and favor the nebula interpretation, although some dust contribution is possible. We have also found transient sources located within a narrow stripe south of LS 5039. We discuss the likelihood of these sources to be related to LS5039.

Original languageEnglish (US)
Article number58
JournalAstrophysical Journal
Volume735
Issue number1
DOIs
StatePublished - Jul 1 2011

Fingerprint

nebulae
pulsars
point sources
point source
x rays
dust
O stars
imaging spectrometers
energetic particles
halos
charge coupled devices
rays
synchrotrons
power law
spectrometer
energetics
scattering
radii
photons

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Durant, Martin ; Kargaltsev, Oleg ; Pavlov, George ; Chang, Chulhoon ; Garmire, Gordon P. / Extended X-ray emission in the vicinity of the microquasar LS 5039 : Pulsar wind nebula?. In: Astrophysical Journal. 2011 ; Vol. 735, No. 1.
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Extended X-ray emission in the vicinity of the microquasar LS 5039 : Pulsar wind nebula? / Durant, Martin; Kargaltsev, Oleg; Pavlov, George; Chang, Chulhoon; Garmire, Gordon P.

In: Astrophysical Journal, Vol. 735, No. 1, 58, 01.07.2011.

Research output: Contribution to journalArticle

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AU - Garmire, Gordon P.

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