Abstract Details
| Name: Abhisek Mohapatra Affiliation: Dept. Of Physics, NIT Rourkela Conference ID: ASI2017_805 Title : Ultraviolet Study of the Large Magellanic Cloud Using GALEX Observations. Authors and Co-Authors : Ananta C. Pradhan, National Institute Of Technology, Rourkela. Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : The LMC has been the center of many photometric surveys at different wavelength bands as it is characterized by a number of environmental differences relative to the Milky Way. GALEX imaged the Magellanic Clouds due to lifting of safety concerns towards end of its mission. The GALEX images contain both stars and diffuse background emission and our focus is to study the both. We have extracted diffuse UV emission by removing all the sources from the images.The estimated dust scattered diffuse emission comes out to be 1000 to 5000 photons per cm^2 s^1 sr^1 Å^1 at the GALEX bands. The FUV diffuse emission correlates well with NUV indicating that both are from dust scattered emission. Scattering in the UV is complementary to the IR emission and a correlation between the two is expected. But we found that diffuse UV emission is flat relative to the infrared emission at IR 100 μm of IRAS and at IR 160 μm of Spitzer due to the high optical depth of UV in the LMC. We have also estimated the diffuse fraction at the GALEX bands that comes out to be 73% – 80%. We cross-matched the GALEX point sources to the MCPS catalog with a matching radius of 3 arcsecond to obtain the optical counterpart of the UV sources. Then we have used the stellar atmosphere models of Castelli & Kurucz (2004) for spectral energy distribution (SED) analysis of the sources. We estimated the spectral types of the stars and extinctions using a least square technique, based on SED analysis. |