Abstract Details

Name: GAUTAM SAIKIA
Affiliation: TEZPUR UNIVERSITY
Conference ID: ASI2016_634
Title : Probing the source of FUV diffuse emission in Orion
Authors and Co-Authors : Gautam Saikia, Tezpur University, Assam. Dr. P. Shalima, Regional Institute of Education Mysore, Karnataka. Dr. Rupjyoti Gogoi, Tezpur University, Assam.
Abstract Type : Poster
Abstract Category : Stars, The Milky Way Galaxy and its neighbours
Abstract : Dust  scattering  is  the  main source  of  diffuse  emission  in  the  Far  Ultraviolet  (FUV). For  several locations  near  M42,  Far Ultraviolet  Spectroscopic  Explorer  (FUSE)  satellite  has  observed diffuse radiation  in  the  FUV  as  scattering  of  starlight  from  the  Trapezium  stars  by dust  in  front  of  the nebula.  The  dust  grains  are  known  to  be  anomalous  in  Orion  with  RV  =  5.5  and  these  are  the first  measurements  of  the  FUV optical  properties  of  the grains  outside  of  “normal”  Milky  Way dust.  Infrared  (IR)  emission features  at  8  micron  are generally attributed  to  Polycyclic  Aromatic Hydrocarbon (PAH)  molecules,  while  emission  at  24  micron  are  attributed  to  Very Small  Grains (VSGs).  We  compare  the  FUV  diffuse  emission  with  the  mid-infrared  (IR)  and  far-IR  diffuse emission  observed  by the  Spitzer  Space  Telescope  (SST)  and  the  Akari  satellite  for  the  same locations. The  intensity  ratios  in  the  different  mid-IR  and  far-IR  bands  for  each  of the  locations will  enable  us  to  determine  the  type of dust contributing  to  the  diffuse emission as well as to derive a more accurate 3D distribution of  stars and dust in  the region. This, in turn, may be  used to model the FUV scattering  in the Orion nebula.Â