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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2019

The host galaxy of GRB 980425/SN1998bw: a collisional ring galaxy

Résumé

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 |$\rm 0.004\, M_{\odot }\, yr^{-1}$|⁠, a gas mass of |$10^{7.1\pm 0.1} \, \mathrm{M}_{\odot}$|⁠, and a stellar mass of |$10^{7.0\pm 0.3} \, \mathrm{M}_{\odot}$|⁠. 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.
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hal-02101661 , version 1 (01-03-2022)

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M. Arabsalmani, S. Roychowdhury, T.K. Starkenburg, L. Christensen, E. Le Floc'H, et al.. The host galaxy of GRB 980425/SN1998bw: a collisional ring galaxy. Monthly Notices of the Royal Astronomical Society, 2019, 485 (4), pp.5411-5422. ⟨10.1093/mnras/stz735⟩. ⟨hal-02101661⟩
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