DETECTING EXTRAGALACTIC DIFFUSE INTERSTELLAR BANDS (DIBS) IN SUPERNOVA 2006X SPECTRA

• Main Author: Destiarasari, Atika
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/79421
• Institution: Institut Teknologi Bandung

Diffuse Interstellar Bands (DIBs) are weak and wide absorption features due to interstellar matter. Studies related to DIBs have been carried out since 1919 by M.L. Heger. Today, there have been ?500 DIBs listed in the catalog (Hobbs et al 2008,2009, Fan et al 2019). DIBs are interesting to study because until now the chemical identifications that cause DIBs are unknown. DIBs can be found in the reddened spectrum of celestial bodies both in our Galaxy and in other galaxies. The purpose of this Final Project is to examine the progress of DIBs study, to detect, and to measure DIBs in other galaxy. Detecting extragalactic DIBs spectrum is a challenging task. One of the way to detect DIBs in other galaxy is to use the supernova spectrum. The supernova acts as a background source to probe interstellar matter in a galaxy. In this Final Project, SN 2006X is used. The data are spectroscopic data observed with European Southern Observatory (ESO) Ultraviolet and Visual Echelle Spectograph (UVES) from the Very Large Telescope (VLT) located at the Nasmyth B focus UT2. Detection of DIBs is done by predicting the wavelength of DIBs in the supernova galaxy spectrum by taking the galaxy redshift into account, observing, and measuring DIBs profile. The central wavelengths of DIBs are taken from the Hobbs et al catalog (2008). In this Final Project, two DIBs have been detected and measured at wavelength ?? 6283 and 6613 ?A. In the measurement result shows redshift z=0.0055. The discovery of DIBs in other galaxies indicates that DIBs are universal.