Wednesday Colloquium

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"Infrared features in the ISM and host galaxies of Young Radio Sources"

Emily Kosmaczewski (Rensselaer Polytechnic Institute (Troy, NY))

I will present on the importance of tracing infrared features in interstellar medium and in the host galaxies of young radio sources. Specifically, I will show the breakdown of polycyclic aromatic hydrocarbon (PAH) infrared emission features, the analysis and fitting of such features, the importance of certain features as tracers for star activity, as well as key correlations in the analysis of ISM.

"50 Years of Pulsars"

Bryn Haskell (NCAC, Warsaw)

Neutron stars are the most exotic nuclear physics laboratories in the universe. With a mass similar to that of the sun, packed in a 10 km radius, their interior densities can exceed nuclear density, and constituents are expected to be superfluid and superconducting. These stars also carry some of the strongest magnetic fields in nature (more than a million times that of the Earth, even for the most weakly magnetised stars), and thus allow us to probe the fundamental forces of nature in extreme conditions. Neutron stars were first observed 50 years ago as pulsating radio sources, or 'pulsars'. In this talk I will review this discovery and what we have learned in these 50 years, including how neutron stars can be used to test general relativity, explore high density physics and even detect gravitational waves.

"Galaxies with prolate rotation in the Illustris simulation"

Ivana Ebrova (NCAC, Warsaw)

Tens of early type galaxies have been recently reported to possess prolate rotation, i.e. significant amount of rotation around the major axis, including two cases in the Local Group. Although expected theoretically, this phenomenon is rarely observed and remains elusive. In order to explore its origin we study the population of well-resolved galaxies in the Illustris cosmological simulation. We follow their evolution back in time and find that the emergence of prolate rotation is strongly correlated with the time of the last significant merger the galaxy experienced. We examine properties of these mergers and compare them with mergers in the reference sample of galaxies drawn from Illustris.


Tomaso Belloni (INAF - Osservatorio Astronomico di Brera)