| Name: | Rohit Mandal |
| Affiliation: | Indian Institute of Space Science and Technology |
| Conference ID: | ASI2025_227 |
| Title: | Diffuse X-ray Emission Around Ultraluminous X-ray Sources: A Systematic Search Using Archival X-ray Data |
| Authors: | Rohit Mandal 1, Andres Gurpide Lasheras 2, Samir Mandal 1 |
| Authors Affiliation: | 1 Rohit Mandal, Samir Mandal Indian Institute of Space Science and Technology, Kerala-695547, India
2 Andres Gurpide Lasheras University of Southampton, Southampton, SO17 1BJ, United Kingdom |
| Mode of Presentation: | Poster |
| Abstract Category: | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract: | Accreting black holes (BHs) and neutron stars (NSs) in binary systems are among the
universe's most powerful X-ray sources. Ultraluminous X-ray sources (ULXs), the most
extreme version of these systems, exhibit X-ray luminosities 100–1,000 times brighter than
standard X-ray binaries. At such high accretion rates, theoretical and numerical studies
indicate powerful outflows, which have been detected either as outflowing gas or as large
(~100 parsec) cavities blown into the surrounding medium.
Most studies of these cavities have been conducted in optical and radio bands. However,
the recent detection of diffuse X-ray emission around a ULX (Belfiore et al. 2020)
demonstrates the potential of X-ray observations to probe these structures. Despite this, no
systematic search for such cavities in the X-ray band has been conducted.
In this study, to identify potential cavities or diffuse structures we are conducting a
systematic search for extended X-ray emission around ULXs by comparing observations
with realistic point spread function PSF simulations. In cases of detection, we are modeling
the wind energetics and accretion history from the spectral and spatial data to provide new
insights into ULX feedback mechanisms. For sources where no extended emission is
detected, we place upper limits on the luminosity of the diffuse X-ray component. We are
undertaking a systematic study to look for extended emission, by comparing observations with
realistic PSF simulations. |
