Abstract Details

Name: PARTHA PRATIM DEKA
Affiliation: Inter-University Centre for Astronomy and Astrophysics
Conference ID: ASI2021_252
Title : A pair of UV nuclei or a compact star forming region near the active nucleus in Mrk 766?
Authors and Co-Authors : P. P. Deka (Inter-University Centre for Astronomy and Astrophysics (IUCAA), SPPU Campus, Pune, India), G. C. Dewangan (Inter-University Centre for Astronomy and Astrophysics (IUCAA), SPPU Campus, Pune, India), K. P. Singh (Indian Institute of Science Education and Research Mohali, Knowledge City, Sector 81, Manauli P.O., SAS Nagar, 140306, Punjab, India), J. Postma (Department of Physics & Astronomy, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada)
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : Here we present the methodology and results of an analysis carried out on AstroSat/UVIT images of Mrk 766 in near and far UV bands. In both the bands, we discovered a compact and bright ultraviolet source at a projected separation of 1.1 kpc from the known active galactic nucleus (AGN) in the galaxy. Using radial profile analysis we derived the UV flux almost free from the nearby contaminating sources for both the primary AGN and the new source. The actual AGN is about 2.5 and 5.6 times brighter than the new source in the far and near UV bands. Visually they appear as a pair of nuclei in the central region of the galaxy. The new source's nature was investigated based on its UV, X-ray, and optical emissions. Because of its lack of X-ray emission, the new source is highly unlikely to be another accreting supermassive black hole in Mrk 766. By measurement of UV/Optical flux of the new source at four different bands, we found that it closely follows the shape of a standard starburst galaxy's spectrum, which strongly suggests that the new source is a compact star-forming region.