Getting stronger with time - the many faces of the Quasar Main Sequence
Swayamtrupta Panda
LNA-MCTI, BR
The Eigenvector 1 schema, or the main sequence of quasars, was introduced as an analogous scheme to the HR diagram that would allow us to understand the more complex, extended sources - active galactic nuclei (AGNs) that harbour accreting supermassive black holes. The study has spanned close to three decades and has advanced our knowledge of the diversity of Type-1 AGNs both from observational and theoretical aspects. The quasar main sequence, in its simplest form, is the plane between the FWHM of the broad Hbeta emission line and the strength of the optical FeII emission with respect to the Hbeta. While the former allows the estimation of the black hole mass, the latter allows direct to measure the metal content and, as I will show, to trace the accretion rate of the AGN. Together, they allow us to track the evolution of AGN in terms of the activity of the central nuclei, its effect on the line-emitting regions surrounding the AGN, and how their diversity makes them suitable distance indicators to study the expansion of our Universe. In this talk, I will provide (i) a brief history leading up to the present day in the study of the quasar main sequence, (ii) introduce you to the many possibilities to study AGNs with the main sequence as a guiding tool, and (iii) highlight some recent, exciting lines of researches at the frontier of this ever-growing field.
I am currently a national postdoctoral fellow at the Laboratório Nacional de Astrofísica, Itajuba, Brazil working with the GEMINI and NOIRLAB-SOAR Observatories. Prior to this position, I was a CNPq fellow and held Kavli and Boya prize fellowships at the Kavli Institute for Astronomy & Astrophysics at Peking University (Beijing, China). I successfully defended my PhD Thesis "Physical Conditions in Broad-line Regions in Active Galaxies" at the Center for Theoretical Physics, Polish Academy of Sciences (Warsaw, Poland) and was awarded a PhD with distinction (2021). I am an associate member of the Vera C. Rubin Observatory's LSST, a member of the Science Team of the Maunakea Spectroscopic Explorer (MSE) and Wide-field Spectroscopic Telescope (WST), and part of the SPLUS Collaboration.
Google Meet: https://meet.google.com/pcw-gmem-jyi
Link da transmissão: https://www.youtube.com/c/AstronomiaIAGUSP/live