The relative wavelength independence of IR lags in active galactic nuclei: implications for the distribution of the hot dust

We show that, contrary to simple predictions, most AGNs show at best only a small increase of lags in the J, H, K, and L bands with increasing wavelength. We suggest that a possible cause of this near simultaneity of the variability from the near-IR to the mid-IR is that the hot dust is in a hollow bi-conical outflow of which we only see the near side. Although most AGNs show near simultaneity of IR variability, there was at least one epoch when NGC 4151 showed the sharply increasing IR lag with the increase of the wavelength. This behaviour might also be present in GQ Comae. We discuss these results briefly. The relative wavelength independence of IR lags simplifies the use of IR lags for estimating cosmological parameters.Comment: 6 pages, 5 figures, for the Odessa Astronomical Publicatio

Spatial regularity of the young stellar population in the ring of NGC 6217

The relative contribution of various physical processes to the spatial and temporal distribution of molecular clouds and star-forming regions in the disks of galaxies has not been fully studied. The spatial regularity in the distribution of the young stellar population in spiral and ring structures is a good test to study this contribution. We investigate photometric properties of the ring and spiral arms in the barred spiral galaxy NGC 6217 based on analysis of GALEX ultraviolet, optical UBVRI and Halpha surface photometry data. The ring in the galaxy is located near the corotation area. A spatial regularity in the distribution of the young stellar population along the galaxy ring was found. The characteristic scale of spacing is about 700 pc. At the same time, we did not find a similar regularity in the distribution of the young stellar population along the spiral arms of NGC 6217. The spatial regularity in concentration of young stellar groupings along spiral arms is a quite rare phenomenon, and it has never been found before in galactic rings.Comment: 5 pages, 5 figures, 2 tables. Accepted for publication in A&A Letters (v2 is the final version

The specifics of social work with victims of terrorism

The international situation in the modern world is characterized by instability, precariousness, and a high risk to the lives of people who may experience the negative consequences of emergencies arising from a variety of factors. Acts of terrorism belong to the phenomena of social emergencies of a criminal nature and currently represent one of the most widespread problems faced by 67% of modern developed and developing countries. Numerous terrorist acts compel heads of countries from around the world to come together and develop the most effective strategies to counter terrorism in their countries and the international community.

The specifics of social work with victims of terrorism

The international situation in the modern world is characterized by instability, precariousness, and a high risk to the lives of people who may experience the negative consequences of emergencies arising from a variety of factors. Acts of terrorism belong to the phenomena of social emergencies of a criminal nature and currently represent one of the most widespread problems faced by 67% of modern developed and developing countries. Numerous terrorist acts compel heads of countries from around the world to come together and develop the most effective strategies to counter terrorism in their countries and the international community.