| Name: | Dheerajkumar Khonde |
| Affiliation: | Student, Master of Science: Astronomy and Astrophysics, Indian Institute of Space Science and Technology, Thiruvananthapuram - 695547, Kerala. |
| Conference ID : | ASI2023_723 |
| Title : | Probing the multiphase circumgalactic medium of a galaxy at z~0.4 |
| Authors : | Dheerajkumar Khonde, MS Astronomy and Astrophysics, Indian Institute of Space Science and Technology (IIST);
Dr. Anand Narayanan, Professor, IIST;
Dr. Vikram Khaire, DST-Inspire Faculty, IIST.
|
| Mode of Presentation: | Poster |
| Abstract Category : | Extragalactic Astronomy |
| Abstract : | The study of the circumgalactic medium is crucial to understand galaxy evolution and dynamics. We use the spectroscopic data, from the Cosmic Origins Spectrograph on the Hubble Space Telescope, of a background quasar, TEX 0206-0438, probing the circumgalactic medium in an absorber system at a redshift of 0.4. It has a large neutral hydrogen column, log [N(H I)] = 18.7, thus categorizing it as a sub-damped Lyman alpha system. We measure the column densities, the Doppler-b parameter, and velocity relative to the observer for several strongly detected metal species. Our photoionization models and inferred metallicity and densities suggest that the absorber system is, in fact, multiphase. We further study the integrated field unit data, from the Multi Unit Spectroscopic Explorer of the Very Large Telescope, centered on the target quasar and after careful quasar PSF (point spread function) subtraction, we find a galaxy on top of the quasar (GOTQ) at the same redshift as the observed absorber system. This means that the multiphase absorber system is a part of the circumgalactic medium of this GOTQ. We are probing the properties of this GOTQ to further understand the origin of absorbing gas and thus the evolution of these galaxies. |
