Toruń Centre for Astronomy
Nicolaus Copernicus University

TCFA Seminar (02.2016)

Mondays at 11.15 in KRA Seminar Room

Selected scientific topics studied in low, medium and high frequency electromagnetic waves, from 0.03 Hz to ~10$^{29}$ Hz

prof. dr hab. Michał Ostrowski, OA UJ

I plan to present a few recent scientific results obtained by my collaborators in Krakow. It will include studies extending from extremely low frequency (ELF; 0.03-300 Hz) electromagnetic waves revealing ionosphere modifications by powerful X-ray-UV solar flares and related energetic proton streams, through optical polarization studies of microflaring in blazars, GRB afterglow light curves analysis in X-rays, to conclude with information about the current work in Poland on the small Cherenkov telescope SST-1M for the Cherenkov Telescope Array observatory.

Planets around evolved stars

Since Nicolaus Copernicus proposed for the first time the model of the Solar System, it has taken nearly 450 yr to detect the first planet around stars other than the Sun (Wolszczan & Frail 1992; Mayor & Queloz 1995; Marcy & Butler 1996). The progress has been much faster since, and the first multiple planetary system orbiting a main-sequence (MS) star was found only a few years later by Butler et al. (1999). Today, the focus of most planet searches is on MS stars with planets in stable habitable zones (HZ).

Semi-empirical analysis of SDSS galaxies: The SEAGal view

Natalia Vale Asari (UFSC, Florianopolis, Brazil), Grazyna Stasińska (LUTH, Observatoire de Paris)

The Sloan Digital Sky Survey (SDSS) obtained spectra of nearly a million of galaxies and organized them in a public database. Many groups of researchers analyzed those data with different techniques and (sometimes) different results. Here we present a selection of the results obtained by the STARLIGHT/SEAGal group, with emphasis on differences with other groups, especially as concerns the emission-line classification of galaxies. In particular, we will argue for the importance of the generally ignored class of retired galaxies.