Uzbekistán: la configuración de un nuevo estado. Especial referencia al estatus de la mujer

Uzbekistan has a long and interesting heritage of ancient civilization linked to the historic “Silk Road”, through which transited people, goods, ideas and cultures. The major cities of the Silk Road - Samarkand, Bukhara, and Khiva are testimonies of the past and leave a deep impression on any visitor. As time goes by, Uzbekistan has become a key country in the whole Central Asian region, because it possesses mineral, agricultural and natural resources and has a huge potential for development. It is rich in energy resources such as oil and gas, but it is very difficult to commercialize them due to its landlocked position. The historical legacy of the Republic of Uzbekistan is a valuable heritage. The above mentioned ancient cities used to be centers of science and art, where important architects created palaces, mosques, madrassas, minarets, and mausoleums of the Islamic style, that still exist today. This cultural wealth is an element of internal cohesion and external outreach towards Islamic heritage, related to such Muslim countries as Turkey and the Gulf States. Moreover, this historical and architectural heritage has enormous economic potential for tourism, which can contribute to strengthen the relations of cooperation and friendship between Uzbekistan and the International Society. The influence of tradition and culture has still a huge impact on the society. This can be felt for example, in the traditional gender roles distribution. As a result of which, meńs presence in the areas of decision making is still slightly higher than womeńs one...

The XMM deep survey in the CDF-S. VI. Obscured AGN selected as infrared power-law galaxies

Context. Accretion onto supermassive black holes is believed to occur mostly in obscured active galactic nuclei (AGN). Such objects are proving rather elusive in surveys of distant galaxies, including those at X-ray energies. Aims. Our main goal is to determine whether the revised IRAC criteria of Donley et al. (2012, ApJ, 748, 142; objects with an infrared (IR) power-law spectral shape), are effective at selecting X-ray type-2 AGN (i.e., absorbed N_H > 10^22 cm^-2). Methods. We present the results from the X-ray spectral analysis of 147 AGN selected by cross-correlating the highest spectral quality ultra-deep XMM-Newton and the Spitzer/IRAC catalogues in the Chandra Deep Field South. Consequently it is biased towards sources with high S/N X-ray spectra. In order to measure the amount of intrinsic absorption in these sources, we adopt a simple X-ray spectral model that includes a power-law modified by intrinsic absorption at the redshift of each source and a possible soft X-ray component. Results. We find 21/147 sources to be heavily absorbed but the uncertainties in their obscuring column densities do not allow us to confirm their Compton-Thick nature without resorting to additional criteria. Although IR power-law galaxies are less numerous in our sample than IR non-power-law galaxies (60 versus 87 respectively), we find that the fraction of absorbed (N_H^intr > 10^22 cm^-2) AGN is significantly higher (at about 3 sigma level) for IR-power-law sources (similar to 2/3) than for those sources that do not meet this IR selection criteria (~1/2). This behaviour is particularly notable at low luminosities, but it appears to be present, although with a marginal significance, at all luminosities. Conclusions. We therefore conclude that the IR power-law method is efficient in finding X-ray-absorbed sources. We would then expect that the long-sought dominant population of absorbed AGN is abundant among IR power-law spectral shape sources not detected in X-rays.