Abstract Details

Name: GANESH N
Affiliation: IISER Tirupati
Conference ID: ASI2020_531
Title : Star formation in Super thin galaxies
Authors and Co-Authors : Ganesh Narayanan, K Aditya and Arunima Banerjee
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : Superthin galaxies(STs) are low surface brightness galaxies(LSBs) with a strikingly high planar to vertical axis ratio of 10 to 20 with little or no bulge component. We systematically study the star formation properties of a sample of a large number of superthins and compare with a general sample of low surface brightness galaxies. Using Galaxy Evolution Explorer (GALEX) ultra-violet (UV) data, we estimate the recent star formation rate (SFR) of a sample of 92 superthins, for which the estimated median value is 0.071 Msun/yr (NUV) and 0.17 Msun/yr (NUV) for the LSB sample. Using photometric data in ten bands and Multi-wavelength Analysis of Galaxy Physical Properties (MAGPHYS), we next determine the SFR averaged over the past 0.1 Gyr for 44 superthins and 50 LSBs. This median star formation rate (SFR) for our sample superthins is 0.129 Msun/yr and that for our sample LSBs is 0.126 Msun/yr, which are comparable to each other. We also estimate SFR from infra-red photometry using WISE (W2) band magnitudes which is comparable to SFR obtained from MAGPHYS for both superthins and LSBs. The star formation time scale is close to that of late type spiral galaxies and we need a few number of bursts to model the star formation history to explain the blue color of these galaxies.