| Name: | Rahul Verma |
| Affiliation: | Indian Institute of Science |
| Conference ID: | ASI2025_258 |
| Title: | Star formation characteristics of dwarf galaxies hosting active galactic nuclei via SED fitting |
| Authors: | Rahul Verma 1, Dr. C. S. Stalin 2 |
| Authors Affiliation: | 1 Indian Institute of Science, Bangalore - 560012, India
2 Indian Institute of Astrophysics, Bangalore - 560036, India |
| Mode of Presentation: | Poster |
| Abstract Category: | Galaxies and Cosmology |
| Abstract: | An important area of current research is the role of active galactic nuclei (AGN)
activity in galaxy evolution. AGNs are known to have an impact on the galaxies
that host them via a process called feedback. This feedback process can have an
effect on the star formation characteristic of their host galaxies. The impact
of AGN on their host galaxies has been extensively studied in massive galaxies
that host AGN. However, much less is known currently about the prevalence of
AGN in dwarf galaxies, and their potential role in driving galaxy evolution.
Simulations also invoke supernova feedback in dwarf galaxies. Only very recently
There is growing observational evidence of the presence of AGN in dwarf galaxies.
While it is natural to expect the AGN in dwarfs to have an effect on the star
formation characteristics of their hosts, similarities and differences, if any, on
the impact of AGN on massive versus dwarf galaxies are unknown. In this work, we
aim to characterise the impact of AGN on their host dwarf galaxies through spectral
energy distribution fitting using CIGALE applied to UV to mid-infrared photometry of a
sample of dwarf galaxies. The same exercise was also carried out on a control
sample of dwarf galaxies without AGN, which had the same distribution of redshift
and absolute brightness as their AGN counterparts. From a systematic and
homogeneous analysis carried out on a sample of dwarf galaxies with AGN and those
without AGN, we found that the star formation activity in dwarf galaxies with
AGN is about a factor of two lower that of dwarf galaxies without AGN. This
suggests that the presence of AGN in dwarfs has a negative feedback effect on
their hosts, with quenching of star formation in them. Details of the results
will be presented. |
