Pian, E ; Møller, P ; Fynbo, J P U ; Zwaan, M A ; Bournaud, F ; Kanekar, N ; Le Floc’h, E ; Christensen, L ; Starkenburg, T K ; Roychowdhury, S ; Arabsalmani, M (2019) The host galaxy of GRB 980425/SN1998bw: a collisional ring galaxy Monthly Notices of the Royal Astronomical Society, 485 (4). pp. 5411-5422. ISSN 0035-8711
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Official URL: http://doi.org/10.1093/mnras/stz735
Related URL: http://dx.doi.org/10.1093/mnras/stz735
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 0.004M⊙yr-1, a gas mass of 107.1±0.1M⊙, and a stellar mass of 107.0±0.3M⊙. 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.
Item Type: | Article |
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Source: | Copyright of this article belongs to Royal Astronomical Society. |
Keywords: | Gamma-Ray Burst: General; Galaxies: Interactions; Galaxies: ISM; Galaxies: Kinematics And Dynamics; Galaxies: Star Formation; Radio Lines: Galaxies. |
ID Code: | 118051 |
Deposited On: | 12 May 2021 07:13 |
Last Modified: | 12 May 2021 07:13 |
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