High-energy γ-ray emission in AGNs and microquasars

نویسنده

  • Josep M. Paredes
چکیده

I review here some of the main observational features in microquasars and AGNs as sources of high-energy γ-rays as well as some of the current models that try to explain the emission in the γ-ray domain.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

High energy processes in microquasars

Microquasars are X-ray binary stars with the capability to generate relativistic jets. It is expected that microquasars are γ-ray sources, because of the analogy with quasars and because the theoretical models predict emission at such energy range. In addition, from observational arguments, there are two microquasars that appear as the possible counterparts for two unidentified high-energy γ-ra...

متن کامل

Time-dependent Synchrotron and Compton Spectra from Microquasar Jets

Jet models for the high-energy emission of Galactic X-ray binary sources have regained significant interest with detailed spectral and timing studies of the X-ray emission from microquasars, the recent detection by the HESS collaboration of very-high-energy $\gamma$-rays from the microquasar LS~5039, and the earlier suggestion of jet models for ultraluminous X-ray sources observed in many nearb...

متن کامل

High-energy Γ-ray Emission from Microquasars: Ls 5039 and Ls I +61 303

The possible associations between the microquasars LS 5039 and LS I +61 303 and the EGRET sources 3EG J1824−1514 and 3EG J0241+6103 suggest that microquasars could also be sources of high-energy γ-rays. In this work, we present a detailed numerical inverse Compton (IC) model, based on a microquasar scenario, that reproduces the high-energy γ-ray spectra and variability observed by EGRET for the...

متن کامل

ar X iv : a st ro - p h / 05 12 16 2 v 1 6 D ec 2 00 5 Gamma Rays from Compton Scattering in the Jets of Microquasars : Application to LS 5039

Recent High Energy Stereoscopic System (HESS) observations show that microquasars in high-mass systems are sources of very high energy γ-rays. A leptonic jet model for microquasar γ-ray emission is developed. Using the head-on approximation for the Compton cross section and taking into account angular effects from the star’s orbital motion, we derive expressions to calculate the spectrum of γ r...

متن کامل

A test on external Compton models for γ-ray active galactic nuclei

There is clear evidence that the γ-ray emission from active galactic nuclei (AGNs) is attributed to the inverse Compton scatterings in the relativistic blobs near the massive black holes. If the soft seed photons are from the regions outside the blobs, a linear relation between (νFν,γ/νFν,synu ) and Doppler factor δ is expected, where νFν,γ and νFν,syn are monochromatic γ-ray and synchrotron fl...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2006