The blue host galaxy of the red GRB 000418

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dc.creatorGorosabel, J.
dc.creatorKlose, S.
dc.creatorChristensen, L.
dc.creatorFynbo, J. P. U.
dc.creatorHjorth, J.
dc.creatorGreiner, J.
dc.creatorTanvir, N.
dc.creatorJensen, B. L.
dc.creatorPedersen, H.
dc.creatorHolland, S. T.
dc.creatorLund, N.
dc.creatorJaunsen, A. O.
dc.creatorCerón, J. M. Castro
dc.creatorCastro-Tirado, A. J.
dc.creatorFruchter, A.
dc.creatorPian, E.
dc.creatorVreeswijk, P. M.
dc.creatorBurud, I.
dc.creatorFrontera, F.
dc.creatorKaper, L.
dc.creatorKouveliotou, C.
dc.creatorMasetti, N.
dc.creatorPalazzi, E.
dc.creatorRhoads, J.
dc.creatorRol, E.
dc.creatorSalamanca, I.
dc.creatorWijers, R. A. M. J.
dc.creatorHeuvel, E. van den
dc.date2003-07-08
dc.date2003-09-23
dc.date.accessioned2026-07-07T12:00:55Z
dc.date.available2026-07-07T12:00:55Z
dc.descriptionWe report on multi-band (UBVRIZJsKs) observations of the host galaxy of the April 18, 2000 gamma-ray burst. The Spectral Energy Distribution (SED) is analysed by fitting empirical and synthetic spectral templates. We find that: (i) the best SED fit is obtained with a starburst template, (ii) the photometric redshift is consistent with the spectroscopic redshift, (iii) the colours of the host are inconsistent with an old stellar population, and (iv) the global extinction is constrained to be in the range Av=0.12-0.61 mag. The derived global extinction agrees with the one reported for the afterglow (Av=0.4-0.9 mag), suggesting a homogeneous distribution of the interstellar medium (ISM) in the host galaxy. These findings are supplemented by morphological information from Hubble Space Telescope (HST) imaging: the surface brightness profile is smooth, symmetric and compact with no underlying structures (like dust lanes, spiral arms or disks). A natural scenario which accounts of all the above results is a nuclear starburst that harbours a young population of stars from which the GRB originated.
dc.description12 pages with 6 encapsulated PostScript figures. Definitive version published in Astronomy & Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/0307153
dc.identifierhttp://arxiv.org/abs/astro-ph/0307153
dc.identifierAstron.Astrophys.409:123-133,2003
dc.identifierdoi:10.1051/0004-6361:20031047
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206942
dc.subjectAstrophysics
dc.titleThe blue host galaxy of the red GRB 000418
dc.typetext

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