El próximo martes 17 de junio, el Dr. JK Krogager, de la Université de Lyon 1, dictará el seminario “Quasars and everything in-between” a las 11:00 horas en la Sala 208 del Instituto de Física, Campus Curauma, PUCV.
Compartimos el resumen de la presentación:
Quasars play an important, yet poorly understood, role in the evolution of galaxies. Current scenarios mainly invoke an evolutionary scenario in which quasars emerge through major merger events, starting out in a fully dust-obscured phase which later evolves to so-called “red quasars”. As the quasars destroy or blow out the obscuring dust, these then transition into the more typically known “blue quasar” phase.
However, this picture is limited by color-selection effects in all large-scale spectroscopic surveys of quasars. Beyond their influence in shaping their host-galaxies, quasars also serve as important cosmic lighthouses enabling us to study intervening galaxies along the lines-of-sight through absorption spectroscopy. Again, the color-selection criteria imposed in quasar surveys affect our conclusions, this time caused by dust-reddening by the foreground, intervening absorption systems.
As these absorption systems are one of the main methods of studying the neutral gas reservoirs of galaxies, such selection biases can have strong implications for our understanding of galaxy evolution.
In this talk, I will focus on my current efforts towards the first color-unbiased quasar survey, the 4MOST-Gaia Purely Astrometric Quasar Survey, to be carried out with the upcoming 4MOST instrument at Paranal. I’ll emphasize its importance not only for understanding the evolution of quasars and their host-galaxies but also for gaining broader insights into the intervening absorption systems along the lines of sight. Lastly, I’ll give a short introduction to the 4MOST instrument and its planned arrival at the VISTA telescope this year.
Extendemos la invitación a la comunidad del Instituto de Física y público interesado a participar de este seminario.
