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http://hdl.handle.net/20.500.12386/28731
Title: | The host galaxy of GRB 980425/SN1998bw: a collisional ring galaxy | Authors: | Arabsalmani, M. Roychowdhury, S. Starkenburg, T. K. Christensen, L. Le Floc'h, E. Kanekar, N. Bournaud, F. Zwaan, M. A. Fynbo, J. P. U. Møller, P. PIAN, Elena |
Issue Date: | 2019 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 485 | Issue: | 4 | First Page: | 5411 | Abstract: | We report Giant Metrewave Radio Telescope (GMRT), Very Large Telescope (VLT), and Spitzer Space Telescope observations of ESO 184-G82, the host galaxy of GRB 980425/SN 1998bw, that yield evidence of a companion dwarf galaxy at a projected distance of 13 kpc. The companion, hereafter GALJ193510-524947, is a gas-rich, star-forming galaxy with a star formation rate of 0.004 M_{☉ } yr^{-1}, a gas mass of 10^{7.1± 0.1} M_{☉}, and a stellar mass of 10^{7.0± 0.3} M_{☉}. The interaction between ESO 184-G82 and GALJ193510-524947 is evident from the extended gaseous structure between the two galaxies in the GMRT H I 21 cm map. We find a ring of high column density H I gas, passing through the actively star-forming regions of ESO 184-G82 and the GRB location. This ring lends support to the picture in which ESO 184-G82 is interacting with GALJ193510-524947. The massive stars in GALJ193510-524947 have similar ages to those in star-forming regions in ESO 184-G82, also suggesting that the interaction may have triggered star formation in both galaxies. The gas and star formation properties of ESO 184-G82 favour a head-on collision with GALJ193510-524947 rather than a classical tidal interaction. We perform state-of-the-art simulations of dwarf-dwarf mergers and confirm that the observed properties of ESO 184-G82 can be reproduced by collision with a small companion galaxy. This is a very clear case of interaction in a gamma-ray burst host galaxy and of interaction-driven star formation giving rise to a gamma-ray burst in a dense environment. | URI: | http://hdl.handle.net/20.500.12386/28731 | URL: | https://academic.oup.com/mnras/article/485/4/5411/5380812 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stz735 | Bibcode ADS: | 2019MNRAS.485.5411A | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Arabsalmani_2019_SN1998bw.pdf | PDF editoriale | 5.49 MB | Adobe PDF | View/Open |
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