Ionizing radiation in the variable active galaxy 3C 120
نویسندگان
چکیده
منابع مشابه
The Effects of the Ionizing Radiation Background on Galaxy Evolution
We find that the amount and nature of the assumed ionizing background can strongly affect galaxy formation and evolution. Galaxy evolution simulations typically incorporate an ultraviolet background which falls off rapidly above z = 3; e.g., that of Haardt & Madau (1996). However, this decline may be too steep to fit the WMAP constraints on electron scattering optical depth or observations of i...
متن کاملSearch for Electron-positron Annihilation Radiation from the Jet in 3c 120
We report an attempt to detect the electron-positron annihilation line from the radio galaxy 3C 120, in which the jet interacts strongly with interstellar clouds. Such interactions should cause most of the jet plasma tomix with the gas in the clouds. This will thermalize the majority of any positrons in the jet, leading to continuous annihilation with ambient electrons. We derive the number den...
متن کاملX-ray Emission from the Radio Jet in 3c 120
We report the discovery of X-ray emission from a radio knot at a projected distance of 25′′ from the nucleus of the Seyfert galaxy, 3C 120. The data were obtained with the ROSAT High Resolution Imager (HRI). Optical upper limits for the knot preclude a simple power law extension of the radio spectrum and we calculate some of the physical parameters for thermal bremsstrahlung and synchrotron sel...
متن کاملThe broad-band spectrum of 3C 120 observed by BeppoSAX
We study a broad-band X-ray observation by BeppoSAX of the broad-line radio galaxy 3C 120. The primary X-ray continuum is well described by a power law with the photon index of Γ ∼ 1.85± 0.05 and a high-energy break or a cutoff. The obtained e-folding energy of ∼ 100–300 keV corresponds to kT ∼ 50 keV in thermal-Compton models. A soft X-ray excess is found at a statistical significance of & 98%...
متن کاملIonizing Radiation
581 *Lieutenant Colonel, U.S. Army; Health Services Command Radiation Protection Staff Officer, Fort Sam Houston, Texas 78234-6000; formerly Chief, Health Physics Division, U.S. Army Environmental Hygiene Agency †Chief, Industrial Health Physics Branch, Health Physics Division, U.S. Army Environmental Hygiene Agency ‡Captain, U.S. Army; Chief, Medical Health Physics Branch, U.S. Army Environmen...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1992
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/255.4.663