| Name: | Anshuman Borgohain |
| Affiliation: | Tezpur University |
| Conference ID : | ASI2024_921 |
| Title : | Local BCD survey using UVIT: Mass Assembly of Dwarf Galaxies |
| Authors : | Anshuman Borgohain1, Kanak Saha2, Rupjyoti Gogoi1 |
| Authors Affiliation: | 1 Department of Physics, Tezpur University, Napaam - 784028, India
2 Inter-University Centre for Astronomy and Astrophysics, Pune - 411007, India |
| Mode of Presentation: | Oral |
| Abstract Category : | Galaxies and Cosmology |
| Abstract : | Extended UV (XUV) disks are a common feature in local spiral galaxies (≥ 20%) and are a tell-tale signature of inside-out growth of disk galaxies. However there exists a dichotomy in dwarf galaxies wherein the local dwarfs show an outside-in assembly mode and those at high redshift (z~2) are seen to comply with the former scenario. To answer this dichotomy, we utilize the rest frame FUV observations, which is indicative of ongoing galaxy growth, of dwarfs throughout the cosmic time. Very recently, high quality AstroSat-UVIT observations have revealed XUV disks in intermediate redshift (0.1≤ z ≤ 0.24) Blue Compact Dwarf galaxies (BCDs). Additionally, the observations indicate that young and massive outer clumps migrate inwards and build up the central stellar mass over ~1 Gyr timescales. To extend our study to local BCDs and to understand the driving factors of such evolution, we did a pilot survey of local BCDs using UVIT - FUV observations and performed multi-wavelength analysis. Here, we present the preliminary results of our analysis wherein we find that atleast 16% of local BCDs in our sample host XUV disks. |
