Abstract Details
| Name: VINOD KT Affiliation: University of Calicut, Thenhipalam Conference ID: ASI2019_522 Title : Study of Central Intensity Ratio in Seyfert galaxies Authors and Co-Authors : Vinod K T, S Aswathy and C D Ravikumar Abstract Type : Poster Abstract Category : Extragalactic Astronomy Abstract : We estimated Central Intensity Ratio (CIR) of nearby Seyfert galaxies (z < 0.0118) 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 18 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 nuclear star formation rate calculated at r = 300pc, star formation rate at r = 1kpc and the mass of the super massive black hole residing at the centre of the galaxy. It is also noted that 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. |