Abstract Details

Name: VINOD K T
Affiliation: UNIVERSITY OF CALICUT
Conference ID: ASI2020_321
Title : The Relationship between Central Intensity Ratio and host galaxy properties in nearby Seyfert Galaxies
Authors and Co-Authors : Vinod K T, C D Ravikumar
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : We estimated Central Intensity Ratio (CIR) of nearby Seyfert galaxies (z < 0.02) using aperture photometry. The CIR is defined as I1/(I2-I1), where I1 and I2 are the intensities of the light within circular apertures of radius 1.5 arcsecs and 3 arcsecs respectively. For this study, we have taken a sample of 20 face-on galaxies with archival images from Hubble Space Telescope using Wide Field Planetary Camera 2 in the F814W filter . We find that CIR shows good correlation with the mass of the super massive black hole residing at the centre of the galaxy whereas it doesnot show any correlation with the black hole accretion rate. It is also noted that CIR shows good correlation with nuclear star formation rate calculated at r = 300pc. But there is no correlation between CIR and extended star formation rate determined at distances greater than 1kpc from the galactic centre. These correlations suggest a novel, simple, photometric way to study the central region of galaxies using CIR.