The class of Compact Steep-spectrum Sources is dominated by double-lobed objects (70%). The remaining 30% are jet-dominated objects, with the jet brightened either by Doppler boosting or by interaction with the ambient media. We show that there is both observational and statistical evidence in favour of an interaction between jets and dense gas clouds. Such an interaction should happen in the N...

We study the effects of neutrino spin-flip, i.e., νe− ν̄τ etc. in the magnetic fields, BAGN of active galactic nuclei (AGN) for neutrinos originating from AGN induced by an interplay of the violation of the equivalence principle (VEP) parameterized by ∆f and/or the twist in BAGN . We consider two situations: i) Spin (flavour)-precession in a reasonable strength of BAGN ii) Adiabatically resonant...

The spectrum emitted by the Broad Emission Line Regions of Active Galactic Nuclei can measure the luminosity of the central object and the chemical composition of the interstellar medium in a very young galaxy, and so constrain the expansion of the universe and the first stages of the evolution of massive galaxies. Here I review some recent developments in our understanding of the nature of the...

We report the detection of a statistically significant flare-like event in the Mg ii λ2800 emission line of 3C 454.3 during the outburst of autumn 2010. The highest levels of emission line flux recorded over the monitoring period (2008–2011) coincide with a superluminal jet component traversing through the radio core. This finding crucially links the broad emission line fluctuations to the non-...

In this letter we report the discovery of a z = 4.88 radio galaxy discovered with a new technique which does not rely on pre-selection of a sample based on radio properties such as steep-spectral index or small angular size. This radio galaxy was discovered in the Elais-N2 field and has a spectral index of α = 0.75, i.e. not ultra-steep spectrum. It also has a luminosity consistent with being d...

a more detailed analysis is made of the energy spectrum of the diffuse component of extragalactic gamma rays over the range of 0.3- 10 gev, obtained fromthe egret instrument at the compton gamma ray observatory. the derived excess energy spectrum of high galactic latitude, b > 60°, using intercept method shows that it is correlated with virgo cluster (over lsr) and average virgo intensity is ab...

obtained from five rich variable star fields at or near the galactic center. In these regions classical Cepheids with periods of less than ten days are infrequent. Five of the eight of shortest period are bright or highly reddened Cepheids, not near the galactic nucleus but in the neighborhood of the Sun. An examination of the distribution of the periods, magnitudes and longitudes of all the 34...