Azeez, Jazeel H. and Abidin, Zamri Zainal and Fadhil, Sadeem Abbas and Hwang, Chorng-Yuan (2022) Analyzing Interferometric CO (3-2) Observations of NGC 4039 (Menganalisis Interferometrik CO (3-2) Pemerhatian NGC 4039). Sains Malaysiana, 51 (4). pp. 1271-1282. ISSN 0126-6039, DOI https://doi.org/10.17576/jsm-2022-5104-25.
Full text not available from this repository.Abstract
Starburst merging galaxies are important in the history of galaxy evolution timeline. For this work, we have chosen the Antennae galaxy (NGC4039), which is one of the most famous starburst merging galaxies. We analyzed the CO (3-2) interferometric observations for the southern mosaic of the NGC 4039, together with the CO (2-1) data taken from Atacama Large Millimeter/Sub-millimeter Array (ALMA). Using the galactic CO luminosity to H-2 mass conversion factor, we found molecular gas mass range in this galaxy to be (0.8-2.92) x 10(8) M-circle dot. Line emissions at CO (2-1) and CO (3-2) were detected at selected regions in the nucleus of NGC 4039. The CO (3-2) /CO (2-1) ratio for this galaxy was calculated to be approximately 0.62. In addition, we found a significant correlation between the brightness temperature ratio and IR luminosity for this galaxy. We used a new model to interpret the rotation curve and found that the most important factor is related to gas mass distribution. The disturbance in the gas distribution may be caused by the merging process. We have also analyzed the spatially resolved star formation law in this galaxy up to 345 parsec. We found a breakdown of the Kennicutt-Schmidt law at this scale. The results are consistent with the previous findings that there is a possibility of sub-thermally excited widespread gas in the neighborhood of denser regions, which causes the flatter star formation law.
| Item Type: | Article |
|---|---|
| Funders: | Universiti Malaya [Grant No: FG033-17 AFR] |
| Uncontrolled Keywords: | Galaxy evolution; NGC 4039; Rotation curve; Sunburst; Star formation |
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 05 Nov 2025 03:09 |
| Last Modified: | 05 Nov 2025 03:09 |
| URI: | http://eprints.um.edu.my/id/eprint/40451 |
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