| Name: Riya Bhowmick |
| Affiliation: Aryabhatta Research Institute of Observational Sciences (ARIES) |
| Conference ID: ASI2026_295 |
| Title: Properties of X-Ray Flux of Jet During the 2019-2020 Outburst of EXO 1846-031 |
| Abstract Type: Oral |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Riya Bhowmick(Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital-263001, Uttarakhand, India), Sujoy Kumar Nath(Indian Centre for Space Physics, 466 Barakhola, Netai Nagar, Kolkata 700099, India), Dipak Debnath(Institute of Astronomy, National Tsing Hua University, Hsinchu 300044, Taiwan), Hsiang Kuang Chang(Department of Physics and Institute of Astronomy, National Tsing Hua University, Hsinchu 300044, Taiwan) |
| Abstract: The Galactic X-ray transient EXO 1846-031 was initially detected during an outburst in 1985 by the EXOSAT mission. After this event, the source remained in a quiescent phase for nearly 34 years until its next outburst, which began on 23 July 2019. The 2019-2020 outburst lasted for nearly ten months, spanning from 23 July 2019 (MJD 58687) to 10 April 2020 (MJD 58949). Our study utilized eleven Swift/XRT observations (1–10 keV) and eight NICER/XTI observations (1–11 keV). To investigate the broadband spectral characteristics, we combined simultaneous MAXI/GSC data (7–20 keV) along with the NICER and Swift data.We investigated the accretion dynamics of this outburst using the Two Component Advective Flow (TCAF) paradigm. During the outburst, the source traversed all four canonical spectral states; hard state (HS), hard intermediate state (HIMS), soft intermediate state (SIMS) and soft state (SS). However, due to limitations in the available data, the exact timing of transitions within the declining intermediate states could not be determined. During the outburst, the black hole candidate (BHC) displayed significant jet activity. In the TCAF model, the normalization parameter is expected to remain fixed for a given source. Thus, any requirement for a significantly altered normalization to achieve improved spectral fits indicates additional X-ray contributions from components not incorporated in the standard TCAF model. By comparing observed fits with the expected normalization, we estimated the fraction of X-rays arising from jets and outflows. Our analysis further explored the origin of the jet. The study also revealed that on certain days, up to ∼92% of the total X-ray flux originated from the base of the jet itself. |
