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The luminous host galaxy, faint supernova and rapid afterglow rebrightening of GRB 100418A

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dc.contributor.author De Ugarte Postigo A.
dc.contributor.author Thöne C.
dc.contributor.author Bensch K.
dc.contributor.author Van Der Horst A.
dc.contributor.author Kann D.
dc.contributor.author Cano Z.
dc.contributor.author Izzo L.
dc.contributor.author Goldoni P.
dc.contributor.author Martín S.
dc.contributor.author Filgas R.
dc.contributor.author Schady P.
dc.contributor.author Gorosabel J.
dc.contributor.author Bikmaev I.
dc.contributor.author Bremer M.
dc.contributor.author Burenin R.
dc.contributor.author Castro-Tirado A.
dc.contributor.author Covino S.
dc.contributor.author Fynbo J.
dc.contributor.author Garcia-Appadoo D.
dc.contributor.author De Gregorio-Monsalvo I.
dc.contributor.author Jelínek M.
dc.contributor.author Khamitov I.
dc.contributor.author Kamble A.
dc.contributor.author Kouveliotou C.
dc.contributor.author Krühler T.
dc.contributor.author Leloudas G.
dc.contributor.author Melnikov S.
dc.contributor.author Nardini M.
dc.contributor.author Perley D.
dc.contributor.author Petitpas G.
dc.contributor.author Pooley G.
dc.contributor.author Rau A.
dc.contributor.author Rol E.
dc.contributor.author Sánchez-Ramírez R.
dc.contributor.author Starling R.
dc.contributor.author Tanvir N.
dc.contributor.author Wiersema K.
dc.contributor.author Wijers R.
dc.contributor.author Zafar T.
dc.date.accessioned 2019-01-22T20:31:42Z
dc.date.available 2019-01-22T20:31:42Z
dc.date.issued 2018
dc.identifier.issn 0004-6361
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/147571
dc.description.abstract © ESO 2018. Context. Long gamma-ray bursts (GRBs) give us the chance to study both their extreme physics and the star-forming galaxies in which they form. Aims. GRB 100418A, at a redshift of z = 0.6239, had a bright optical and radio afterglow, and a luminous star-forming host galaxy. This allowed us to study the radiation of the explosion as well as the interstellar medium of the host both in absorption and emission. Methods. We collected photometric data from radio to X-ray wavelengths to study the evolution of the afterglow and the contribution of a possible supernova (SN) and three X-shooter spectra obtained during the first 60 h. Results. The light curve shows a very fast optical rebrightening, with an amplitude of ∼3 magnitudes, starting 2.4 h after the GRB onset. This cannot be explained by a standard external shock model and requires other contributions, such as late central-engine activity. Two weeks after the burst we detect an excess in the light curve consistent with a SN with peak absolute magnitude MV = -18.5 mag, among the faintest GRB-SNe detected to date. The host galaxy shows two components in emission, with velocities differing by 130 km s-1, but otherwise having similar properties. While some absorption and emission components coincide, the absorbing gas spans much higher velocities, indicating the presence of gas beyond the star-forming regions. The host has a star formation rate of SFR = 12.2 M⊙ yr-1, a metallicity of 12 + log(O/H) = 8.55, and a mass of 1.6⊙ ×⊙ 109 M⊙. Conclusions. GRB 100418A is a member of a class of afterglow light curves which show a steep rebrightening in the optical during the first day, which cannot be explained by traditional models. Its very faint associated SN shows that GRB-SNe can have a larger dispersion in luminosities than previously seen. Furthermore, we have obtained a complete view of the host of GRB 100418A owing to its spectrum, which contains a remarkable number of both emission and absorption lines.
dc.relation.ispartofseries Astronomy and Astrophysics
dc.subject Galaxies: dwarf
dc.subject Gamma-ray burst: individual: GRB 100418A
dc.subject ISM: abundances
dc.subject ISM: kinematics and dynamics
dc.subject Supernovae: individual: GRB 100418A
dc.title The luminous host galaxy, faint supernova and rapid afterglow rebrightening of GRB 100418A
dc.type Article
dc.relation.ispartofseries-volume 620
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS00046361-2018-620-SID85058891423


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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