| Name: | Md Rashid |
| Affiliation: | Indian Institute of Science |
| Conference ID : | ASI2022_587 |
| Title : | Studies of ISM properties in Orion HII Region at Low Frequency |
| Authors : | 1. Md Rashid PhD, Joint Astronomy Program, Indian Institute of Science, Bangalore-560012, India 2. Nirupam Roy Assistant Professor, Department of Physics, Indian Institute of Science, Bangalore-560012, India |
| Abstract Type: | Poster |
| Abstract Category : | Stars, ISM and Galaxy |
| Abstract : | Physical conditions of the Interstellar Medium (ISM) in the star forming regions have profound influence on the star formation process. However, the exact role of these physical properties (e.g. temperature and density) in regulating star formation rate is still open to questions. The Orion Nebula hosts star forming clusters and it’s close proximity (414 ±7 pc) makes it a crucial target to study vital properties of the star-forming region. We have utilized the enhanced capabilities and unique frequency coverage of the upgraded Giant Meter-wave Radio Telescope (uGMRT) to study the physical condition of ISM at Orion HII region in low frequencies. In this study, the continuum and spectral line analysis of interferrometric data at band-3 (300 MHz - 500 Mhz) of uGMRT will be presented for the Orion Nebula. 200 MHz instantaneous Band Width (BW) centered at 400 MHz is used to produce a continuum map. Signatures of non-thermal emission in some part region are found from the in-band spectral index map. A detailed and systematic simulation has been carried out taking uGMRT specific observational parameters into account so as to understand this new result better as well as understand and explore the requirements to produce reliable estimation of spectral index values. The results from the observational data have been compared with the simulation to establish the reliability of the spectral index values obtained. Furthermore, to utilize the advantage of good spectral resolution of the data we are working on stacking of the image cubes of Radio Recombination Lines (RRL) falling in the band. The stacking method results in increase of the signal to noise ratio and detect weak RRL’s which may help to constrain the temperature of the ionized ISM of the Orion region. The preliminary results of the RRL stacking are encouraging. |