منابع مشابه
γ - ray emission from microquasars : a numerical model for LSI + 61 ◦ 303
We explore the possible association between the microquasar LSI +61303 and the EGRET source 2CG 135+01/3EG J0241+6103 by studying, with a detailed numerical model, whether this system can produce the emission and the variability detected by EGRET (>100 MeV) through inverse Compton (IC) scattering. Our numerical approach considers a population of relativistic electrons entrained in a cylindrical...
متن کاملRapid expansion in the VLBI structure of LSI + 61 ◦ 303
We present the results of global VLBI observations at 6 cm wavelength of the X-ray binary LSI+61◦303 made at epoch 1992.4. During the course of our 24 hour VLBI observing session, the integrated flux measured simultaneously with the VLA indicated that the source was experiencing a minor flare, with the total flux rising and falling by ∼ 12 mJy. Our VLBI observations indicate that this brighteni...
متن کاملINTEGRAL and XMM - Newton observations of LSI + 61 ◦ 303
LSI +61 303 is one of the few X-ray binaries with Be star companion from which both radio and high-energy gamma-ray emission have been observed. We present XMM-Newton and INTEGRAL observations which reveal variability of the X-ray spectral index of the system. The X-ray spectrum is hard (photon index Γ ≃ 1.5) during the orbital phases of both high and low X-ray flux. However, the spectrum softe...
متن کاملThe distances to the X - ray binaries LSI + 61 ◦ 303 and A 0535 + 262
Chevalier & Ilovaisky (1998) use Hipparcos data to show that the X-ray binary systems LSI+61◦ 303 and A0535+262 are a factor of ten closer (i.e. d ∼ few hundred pc) than previously thought (d ∼ 2kpc). We present high quality CCD spectra of the systems, and conclude that the spectral types, reddening and absolute magnitudes of these objects are strongly inconsistent with the closer distances. We...
متن کاملINTEGRAL and XMM - Newton observations of a micro - blazar LSI + 61 ◦ 303
LSI +61 303 is one of the few X-ray binaries with Be star companion from which both radio and high-energy gamma-ray emission have been observed. We present XMM-Newton and INTEGRAL observations which reveal variability of the X-ray spectral index of the system. The X-ray spectrum is hard (photon index Γ ≃ 1.5) during the orbital phases of both high and low X-ray flux. However, the spectrum softe...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1981
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/194.1.1p