Unveiling Multiple Physical Processes on a Cluster Galaxy at z=0.3 Using JWST
| Autor: | Watson, Peter J., Vulcani, Benedetta, Werle, Ariel, Poggianti, Bianca, Gullieuszik, Marco, Trenti, Michele, Wang, Xin, Roy, Namrata |
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| Rok vydání: | 2024 |
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| Druh dokumentu: | Working Paper |
| Popis: | We present a study of a previously identified candidate ``jellyfish'' galaxy in the Abell 2744 cluster, F0083, which showed faint signs of a tidal interaction in archival imaging. We used publicly available, PSF-matched deep photometric data from the Hubble and James Webb Space Telescopes, to infer the spatially-resolved star-formation history of this galaxy. F0083 shows clear signs of ram-pressure stripping (RPS), with a recently enhanced star-formation rate (SFR) orientated towards the South-West quadrant of the stellar disc. The stellar mass surface density is heavily asymmetric, with a variation of nearly 1 dex between the Western spiral arm and the postulated tidal feature. This feature appears to contain a high proportion of older stars, ruling out RPS as the cause of this ``unwinding''. An investigation of nearby galaxies reveals the most probable interaction candidate to be a compact elliptical galaxy, 28171, of mass $\log_{10}(M_*/\rm{M}_{\odot})=8.53\pm0.04$ embedded in the tidal stream along our line-of-sight. The star-formation history of the tidal feature indicates a steep change in SFR at lookback times $t_L\lesssim1\,$Gyr. The most probable formation scenario of F0083 thus indicates a low-speed interaction with 28171, followed by RPS as the combined system approaches pericentre passage. Our results demonstrate the ability of photometric data to distinguish between these consecutive processes. Comment: 18 pages, 14 figures. Submitted to A&A |
| Databáze: | arXiv |
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