Abstract Details

Affiliation: Indian Institute of Astrophysics, Bangalore
Conference ID: ASI2017_1157
Title : Determination of the size of the dust torus in H0507+164 through Optical-IR monitoring
Authors and Co-Authors : Suvendu Rakshit, Pandge M.*, C. S. Stalin and Ram Sagar Indian Institute of Astrophysics, Bangalore 560 034 *Dayanand Science College, Latur, Maharashtra
Abstract Type : Poster
Abstract Category : Extragalactic astronomy
Abstract : Active Galactic Nuclei (AGN) are powered by accretion of matter onto super-massive black hole (SMBH) located at the centres of galaxies. According to the unified model of AGN, a dusty torus surrounds the broad line region (BLR) and the central SMBH. Torus is thus one of the most important ingredients in AGN that divides it in many categories. But, it is very difficult to resolve the central regions of AGN and find the extent of the dusty torus using conventional imaging techniques. However, recently, near-infrared (NIR) interferometric observations have been able to measure the angular size of the dusty torus in only 23 AGN. This method of NIR interferrometry can only be used on only the nearby and bright AGN. An alternative approach to find the inner edge of the dusty torus is through the technique of reverberation mapping. This uses the response of NIR emission from the torus to variations in the UV/optical radiation from the central engine. We have carried out a systematic optical and near IR monitoring of a carefully selected low-luminous AGN, H0507+164. These observations are used to find the first measurement of the inner radius of the torus. Observations in different IR bands are also used to constrain the torus structure. Details of the results will be presented.