Inverse Compton Origin of the Hard X-ray and Soft Gamma-ray Emission from the Galactic Ridge
نویسندگان
چکیده
A recent re-determination of the non-thermal component of the hard X-ray to soft γ-ray emission from the Galactic ridge, using the SPI instrument on the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) Observatory, is shown to be well reproduced as inverse-Compton emission from the interstellar medium. Both cosmic-ray primary electrons and secondary electrons and positrons contribute to the emission. The prediction uses the GALPROP model and includes a new calculation of the interstellar radiation field. This may solve a long-standing mystery of the origin of this emission, and potentially opens a new window on Galactic cosmic rays. Subject headings: elementary particles — cosmic rays — gamma-rays: theory
منابع مشابه
Diffuse Galactic Soft Gamma-Ray Emission
The Galactic diffuse soft gamma-ray (30-800 keV) emission has been measured from the Galactic Center by the HIREGS balloon-borne germanium spectrometer to determine the spectral characteristics and origin of the emission. The resulting Galactic diffuse continuum is found to agree well with a single power-law (plus positronium) over the entire energy range, consistent with RXTE and COMPTEL/CGRO ...
متن کاملDiffuse Galactic hard X-ray and low-energy gamma-ray continuum
We summarize some recent results related to observations and interpretation of hard X-ray and low-energy -ray diffuse Galactic continuum emission. Combined spectra based on data from OSSE, COMPTEL and EGRET are presented. In the energy range 1-30 MeV covered by COMPTEL the spectrum of the diffuse emission has been measured and is consistent with a combination of bremsstrahlung and inverse-Compt...
متن کاملA 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 کاملOrigin of the hard x-ray emission from the Galactic plane.
The Galactic plane is a strong emitter of hard x-rays (2 to 10 kiloelectron volts), and the emission forms a narrow continuous ridge. The currently known hard x-ray sources are far too few to explain the ridge x-ray emission, and the fundamental question of whether the ridge emission is ultimately resolved into numerous dimmer discrete sources or truly diffuse emission has not yet been settled....
متن کاملStudy of the Spectral and Temporal Characteristics of X-ray Emission of the Gamma-ray Binary Ls 5039 with Suzaku
We report on the results from Suzaku broadband X-ray observations of the galactic binary source LS 5039. The Suzaku data, which have continuous coverage of more than one orbital period, show strong modulation of the X-ray emission at the orbital period of this TeV gamma-ray emitting system. The X-ray emission shows a minimum at orbital phase ∼ 0.1, close to the so-called superior conjunction of...
متن کامل