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

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

M. Arabsalmani
(
- IRFU, Saclay and
- AIM, Saclay
)
,
S. Roychowdhury
(
- Jodrell Bank and
- Orsay, IAS
)
,
T.K. Starkenburg
(
- Flatiron Inst., New York
)
,
L. Christensen
(
- DARK Cosmology Ctr.
)
,
E. Le Floc'h
(
- IRFU, Saclay and
- AIM, Saclay
)

Mar 1, 2019

12 pages

Published in:

Mon.Not.Roy.Astron.Soc. 485 (2019) 4, 5411-5422

Published: Jun 1, 2019

e-Print:

1903.00485 [astro-ph.GA]

DOI:

10.1093/mnras/stz735 (publication)

View in:

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Abstract: (Oxford University Press)

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.

Note:

Accepted for publication in MNRAS. For the definitive version visit 'https://academic.oup.com/mnras'

gamma-ray burst: general
galaxies: interactions
galaxies: ISM
galaxies: kinematics and dynamics
galaxies: star formation
radio lines: galaxies

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