| Description: | [DPS Seminar] Dr. Arghajit Jana (Universidad Diego Portales, Santiago, Chile) -- Exploring Changing-Look AGNs from Long-term Multiwavelength Observations |
| Date: | Thursday, Feb 29, 2024 |
| Time: | 2:30 p.m. - 4 p.m. |
| Venue: | Meghnad Saha Lecture Theatre |
| Details: | In the past few years, a new subset of AGNs have emerged that show dramatic variability in the X-rays and optical/UV bands. These sources are known as 'changing-look AGN'(CLAGN), and can be divided into two classes. Changing-obscuration AGNs show strong variability of the line-of-sight column density, mostly associated with clouds or outflows eclipsing the central engine of the AGN. Changing-state AGN are instead objects in which the continuum emission and broad emission lines appear or disappear, and are typically triggered by strong changes in the accretion rate. These CLAGNs are not well understood and cannot be explained by the standard unified model. Here I will present the current understanding of the CLAGN, and discuss open questions and future prospects. |
| Calendar: | Seminar Calendar (entered by rajni) |